Science Trivia Question and Answers

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, MSEd (Science Education)
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Quizzes Created: 3 | Total Attempts: 40,493
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1.

Where is the uvula found in humans?

Answer: Throat
Explanation:
The uvula is found in the back of the throat, specifically in the soft palate region. It is a small, fleshy extension hanging down from the soft palate and plays a role in speech articulation and preventing food from entering the nasal cavity during swallowing.
2.

What body covering is unique to mammals?

Answer: Hair
Explanation:
Hair is a unique body covering to mammals because it is a defining characteristic that sets them apart from other animals. Hair serves various functions such as insulation, protection, sensory perception, and camouflage. It is made of keratin, a protein that is also found in nails and hooves. The presence of hair is a key feature used to classify an animal as a mammal, making it a distinguishing trait of this particular group of animals.
3.

Which scientists study life from long ago?

Answer: Paleontologists
Explanation:
Paleontologists study fossils and remnants of ancient life forms to understand the history of life on Earth. By examining these remains, paleontologists can reconstruct past environments, study evolutionary processes, and gain insights into the diversity of life that existed in the past. Their work helps us understand the origins and development of different species and ecosystems over millions of years.
4.

Which study is specifically about birds?

Answer: Ornithology
Explanation:
Ornithology is the study of birds, including their behavior, physiology, and ecology. This field of study focuses specifically on birds and their unique characteristics, making it the correct answer for a question about a study related to birds.
5.

Which bone in the human body is the longest?

Answer: Femur
Explanation:
The femur is the longest bone in the human body, measuring approximately one-quarter of a person's height. It is located in the thigh and is crucial for supporting the body's weight and facilitating movement. The femur also plays a vital role in protecting the delicate tissues and organs in the lower body.
6.

The human heart has how many chambers?

Answer: Four
Explanation:
The human heart is composed of four chambers - two atria and two ventricles. The atria receive blood from the body and lungs, while the ventricles pump blood out to the body and lungs. This four-chambered structure allows for efficient circulation of oxygenated and deoxygenated blood throughout the body.
7.

The theory that living organisms mutate and change is called what?

Answer: Evolution
Explanation:
Evolution is the correct answer because it refers to the scientific theory that explains how living organisms change and adapt over time through genetic mutations and natural selection. This process leads to the diversity of species we see today and is supported by a vast amount of evidence from various scientific fields such as genetics, paleontology, and comparative anatomy.
8.

Which teeth do we use to grind our food?

Answer: Molars
Explanation:
Molars are the teeth located at the back of the mouth that are used for grinding and chewing food. They have a large, flat surface area with multiple cusps that help break down food into smaller pieces, making it easier to swallow and digest. The molars play a crucial role in the chewing process by crushing and grinding food particles before they are swallowed.
9.

Human eyes of what color are the most light-sensitive?

Answer: Blue
Explanation:
Blue eyes are the most light-sensitive because they have less melanin in the iris, allowing more light to pass through and reach the retina. This increased sensitivity to light can sometimes cause people with blue eyes to experience more discomfort in bright light or sunlight compared to those with darker eye colors.
10.

What is the proper anatomical name for the collar bone?

Answer: Clavicle
Explanation:
The proper anatomical name for the collar bone is clavicle. The clavicle is a long bone that serves as a strut between the shoulder blade and the sternum or breastbone. It helps to support the shoulder and arm, as well as protect underlying nerves and blood vessels.
11.

What is the heaviest human organ?

Answer: Liver
Explanation:
The liver is considered the heaviest human organ because it is the largest internal organ in the body, weighing on average between 3.2 to 3.5 pounds in adults. It plays a crucial role in various bodily functions such as detoxification, metabolism, and nutrient storage. Its size and weight contribute to its importance in maintaining overall health and well-being.
12.

What marine animal has the male carry the eggs in a pouch?

Answer: Seahorse
Explanation:
Seahorses are unique among marine animals because it is the male seahorse that carries the eggs in a pouch until they hatch. This is a rare phenomenon in the animal kingdom where typically it is the female that carries and cares for the offspring. The seahorse's pouch provides a safe environment for the eggs to develop and for the male to provide nutrients and protection to the developing embryos. This role reversal in parental care is a fascinating adaptation that sets seahorses apart from other marine animals.
13.

The hammer and stirrup are found in what organ?

Answer: Ear
Explanation:
The hammer and stirrup are two of the three tiny bones located in the middle ear, along with the anvil. These bones are also known as the ossicles and are responsible for transmitting sound vibrations from the eardrum to the inner ear. They play a crucial role in the process of hearing by amplifying and transmitting sound waves.
14.

What is the part of the Earth where life exists called?

Answer: Biosphere
Explanation:
The part of the Earth where life exists is called the biosphere, which encompasses all the ecosystems and living organisms on the planet. This term refers to the interconnected web of life that includes all living organisms, from the tiniest bacteria to the largest whales, and the environments in which they live. The biosphere plays a crucial role in maintaining the balance of life on Earth and supporting the diversity of species that inhabit our planet.
15.

Where are the smallest bones in the body?

Answer: Ear
Explanation:
The smallest bones in the body are located in the ear. These three tiny bones, known as the ossicles, are called the malleus, incus, and stapes. They are essential for transmitting sound vibrations from the eardrum to the inner ear, where they are converted into electrical signals that the brain can interpret as sound.
16.

What class of drug is used to induce urination?

Answer: Diuretic
Explanation:
Diuretics are a class of drugs that promote the production of urine by increasing the excretion of water and salts from the kidneys. They are commonly used to treat conditions such as high blood pressure, heart failure, and edema by reducing fluid retention in the body. By increasing urine output, diuretics help to remove excess fluid and waste products from the body, leading to a decrease in blood volume and pressure.
17.

What is the formal system for naming plants and animals called?

Answer: Nomenclature
Explanation:
The formal system for naming plants and animals is called nomenclature, which involves assigning scientific names to different species based on specific rules and conventions. This system helps to ensure clarity and consistency in the identification and classification of organisms, allowing for effective communication among scientists and researchers worldwide.
18.

Which word would refer to an animal leaving its birthplace to live elsewhere?

Answer: Relocation
Explanation:
The word "relocation" refers to the act of an animal leaving its birthplace to live elsewhere. This term is commonly used to describe the movement of animals from one habitat to another in search of better resources or environmental conditions.
19.

Exposure to what part of sunlight can increase the chance of skin cancer?

Answer: Ultraviolet
Explanation:
Exposure to ultraviolet rays in sunlight can increase the chance of skin cancer because these rays penetrate the skin and can damage the DNA in skin cells, leading to mutations that can result in cancerous growths. Overexposure to ultraviolet rays, especially from the sun, can increase the risk of developing skin cancer such as melanoma, basal cell carcinoma, and squamous cell carcinoma. It is important to protect the skin from excessive sun exposure to reduce the risk of skin cancer.
20.

What part of blood helps with clotting?

Answer: Platelets
Explanation:
Platelets are small cell fragments in the blood that play a crucial role in the blood clotting process. When there is an injury or damage to a blood vessel, platelets adhere to the site and release chemicals that attract more platelets to form a plug, stopping the bleeding. This clotting mechanism is essential for preventing excessive blood loss and promoting wound healing.
21.

Where are the carpal tunnel and the median nerve found?

Answer: Wrist
Explanation:
The carpal tunnel and the median nerve are found in the wrist. The carpal tunnel is a passageway in the wrist formed by bones and ligaments, through which the median nerve and tendons pass. The median nerve is a major nerve in the arm that controls movement and sensation in the hand. The wrist is a common location for issues related to the carpal tunnel and median nerve due to its anatomy and the high level of use and mobility in the hand and wrist.
22.

What gall bladder secretion helps digest fats?

Answer: Bile
Explanation:
Bile is a digestive fluid produced by the liver and stored in the gallbladder. It helps in the digestion and absorption of fats in the small intestine by breaking down large fat globules into smaller droplets, making it easier for enzymes to digest them. Bile also helps in the absorption of fat-soluble vitamins such as A, D, E, and K.
23.

What is the area inhabited by an animal called?

Answer: Habitat
Explanation:
An animal's habitat refers to the specific area or environment where it naturally lives and thrives. This includes the physical surroundings, such as the type of land, water, and vegetation, as well as the other animals and plants that coexist in that particular area. The habitat provides everything the animal needs to survive, including food, shelter, and a suitable climate. It is crucial for the well-being and survival of the animal species.
24.

What atomic particle has a negative charge?

Answer: Electron
Explanation:
An electron is a subatomic particle that carries a negative charge. It orbits around the nucleus of an atom and is involved in various chemical reactions and electrical conductivity due to its negative charge.
25.

What protein makes up hair and nails?

Answer: Keratin
Explanation:
Keratin is a fibrous structural protein that is the main component of hair, nails, and the outer layer of skin. It provides strength and helps protect these structures from damage. Keratin is produced by specialized cells called keratinocytes and plays a crucial role in maintaining the integrity and health of hair and nails.
26.

Which chambers of the human heart pump blood out of the heart?

Answer: Ventricles
Explanation:
The ventricles are the two lower chambers of the human heart responsible for pumping blood out of the heart. They have thicker, more muscular walls compared to the atria, allowing them to pump blood to the lungs and the rest of the body. The left ventricle pumps oxygen-rich blood to the body, while the right ventricle pumps oxygen-poor blood to the lungs for oxygenation.
27.

A predator eats what animals?

Answer: Prey
Explanation:
Predators eat prey animals as a means of survival. Prey are the animals that are hunted and consumed by predators in the wild. This relationship is essential for maintaining the balance of ecosystems, as predators help control the population of prey species. By preying on other animals, predators ensure that the ecosystem remains healthy and diverse.
28.

Green plants fill what role in the food chain?

Answer: Producers
Explanation:
Green plants fill the role of producers in the food chain. As producers, they are able to create their own food through the process of photosynthesis, converting sunlight into energy. This energy is then passed on to primary consumers, such as herbivores, who consume the plants. This makes green plants essential for the survival of all other organisms in the food chain, as they form the base of the ecosystem and provide energy for all other organisms.
29.

Sugar and starch are in what nutrient group?

Answer: Carbohydrates
Explanation:
Sugar and starch are both types of carbohydrates. Carbohydrates are a macronutrient that provides the body with energy. They are broken down into glucose, which is used as fuel for the body's cells. Sugar is a simple carbohydrate, while starch is a complex carbohydrate. Both are important sources of energy for the body.
30.

What organ comes just after the esophagus in the digestive tract?

Answer: Stomach
Explanation:
The stomach comes just after the esophagus in the digestive tract because it is the next organ in line to receive food that has been swallowed. The esophagus delivers the chewed food to the stomach where it begins the process of digestion through the release of gastric juices and enzymes. This allows for further breakdown of the food before it moves on to the small intestine for absorption of nutrients.
31.

The teeth, liver, tongue, stomach and intestines belong to what human organ system?

Answer: Digestive
Explanation:
The teeth, liver, tongue, stomach, and intestines are all components of the digestive system, which is responsible for breaking down food into nutrients that can be absorbed by the body. Each of these organs plays a specific role in the process of digestion, from the mechanical breakdown of food by the teeth to the chemical breakdown of food in the stomach and intestines. Overall, the digestive system ensures that the body receives the necessary nutrients for energy and growth.
32.

In biology, what is described as the basic building block of life?

Answer: Cell
Explanation:
Cells are considered the basic building blocks of life because they are the smallest unit of life that can replicate independently. Cells perform all the necessary functions for an organism to survive and thrive, including growth, reproduction, and responding to stimuli. Each cell contains genetic material, organelles, and other components that work together to carry out specific functions. This fundamental unit of life is essential for the structure, function, and overall organization of living organisms.
33.

What single-celled organisms help in the decomposition of waste and the spread of disease?

Answer: Bacteria
Explanation:
Bacteria are single-celled organisms that play a crucial role in the decomposition of waste by breaking down organic matter. However, some bacteria can also spread diseases through various means such as contaminated food or water, making them important in both the ecosystem and public health.
34.

In sexual reproduction, which chromosome combination results in female offspring?

Answer: XX
Explanation:
The combination of XX chromosomes results in female offspring in sexual reproduction because females have two X chromosomes, one inherited from each parent. This combination determines the development of female reproductive anatomy and characteristics.
35.

A normal human body cell contains how many pairs of chromosomes?

Answer: 23
Explanation:
A normal human body cell contains 23 pairs of chromosomes, totaling 46 individual chromosomes. These chromosomes carry genetic information that determines various traits and characteristics of an individual. Each parent contributes one set of 23 chromosomes, resulting in the full complement of 46 chromosomes in a human cell.
36.

What substance are cell walls made of?

Answer: Cellulose
Explanation:
Cell walls are primarily composed of cellulose, which is a structural polysaccharide found in the cell walls of plants. Cellulose provides rigidity and support to plant cells, allowing them to maintain their shape and structure. Additionally, cellulose is an important component in the dietary fiber of plants, aiding in digestion and providing numerous health benefits.
37.

If someone has celiac disease, what are they allergic to?

Answer: Wheat
Explanation:
People with celiac disease are not actually allergic to wheat, but rather they have an autoimmune reaction to gluten, a protein found in wheat and other grains like barley and rye. This autoimmune reaction damages the lining of the small intestine and can lead to various symptoms and long-term health issues.
38.

Which brain region is responsible for vision?

Answer: Occipital
Explanation:
The occipital lobe is responsible for processing visual information received from the eyes. Located at the back of the brain, the occipital lobe contains the primary visual cortex which interprets visual stimuli and helps us perceive and make sense of the world around us. This region plays a crucial role in visual perception, object recognition, and spatial awareness.
39.

Each finger of the human hand has how many bones?

Answer: Three
Explanation:
Each finger of the human hand consists of three bones: the proximal phalanx, the middle phalanx, and the distal phalanx. These three bones make up the structure of each finger, allowing for movement and dexterity in the hand.
40.

Hibernation is to winter as what is to summer?

Answer: Estivation
Explanation:
Estivation is a period of inactivity or dormancy in animals during hot and dry summer months, similar to how hibernation is a period of inactivity during the cold winter months. Both processes help animals conserve energy and survive extreme environmental conditions.
41.

Who created a simple test to rate the health of newborn babies?

Answer: Virginia Apgar
Explanation:
Virginia Apgar, an American obstetrical anesthetist, created the Apgar score in 1952 to quickly assess the health of newborn babies. The Apgar score evaluates the baby's heart rate, respiratory effort, muscle tone, reflex irritability, and color, providing a simple and effective way to determine if immediate medical intervention is needed after birth.
42.

What ear secretion is also called cerumen?

Answer: Earwax
Explanation:
Ear secretion that is also known as cerumen is a natural substance produced by the glands in the ear canal. It helps to protect the ear by trapping dust, dirt, and other particles, preventing them from entering the ear and causing damage. Earwax also helps to lubricate the ear canal and prevent it from becoming dry and itchy.
43.

Which vitamin is produced in the skin through sun exposure?

Answer: Vitamin D
Explanation:
Vitamin D is produced in the skin through sun exposure when ultraviolet B (UVB) rays from the sun interact with a type of cholesterol found in the skin. This process triggers the production of vitamin D, which is essential for maintaining strong bones, supporting the immune system, and regulating calcium levels in the body. Sun exposure is a crucial source of vitamin D, as it is difficult to obtain enough of this vitamin through diet alone.
44.

What layer of skin is found right below the epidermis?

Answer: Dermis
Explanation:
The dermis is the layer of skin found right below the epidermis. It is composed of connective tissue and contains blood vessels, nerves, hair follicles, and sweat glands. The dermis provides structural support to the skin and is responsible for regulating temperature and sensation.
45.

The brain and spinal cord contain what sort of cells?

Answer: Nerve Cells
Explanation:
Nerve cells, also known as neurons, are the primary cells found in the brain and spinal cord. These cells are responsible for transmitting electrical and chemical signals throughout the nervous system, allowing for communication between different parts of the body. Nerve cells play a crucial role in processing information, controlling movement, and regulating bodily functions.
46.

What tissue connects muscles to bones?

Answer: Tendons
Explanation:
Tendons are the connective tissue that attaches muscles to bones. They are strong, fibrous cords that transmit the force generated by the muscle to the bone, allowing movement to occur. Tendons play a crucial role in the functioning of the musculoskeletal system by providing stability and facilitating movement.
47.

Which animal does not have a larval stage?

Answer: Human
Explanation:
Humans do not have a larval stage because they develop directly from embryos into infants. In contrast, many animals, such as insects and amphibians, go through a larval stage before reaching adulthood. This stage involves significant physical changes and often serves as a transitional phase in their life cycle.
48.

What sort of organism is a kapok?

Answer: A Tree
Explanation:
Kapok is a type of tree that is native to tropical rainforests. It is known for its tall stature and large, spreading branches. The kapok tree produces fluffy fibers that are used in various products such as pillows and life jackets. Its seeds are housed in pods that burst open when mature, releasing the seeds along with a cotton-like material that helps them disperse in the wind. The kapok tree plays a vital role in the ecosystem by providing habitat for various species and contributing to the overall biodiversity of the rainforest.
49.

What part of a plant contains the anthers?

Answer: Flower
Explanation:
The anthers are part of the reproductive structure of a flower, specifically located within the stamen. Anthers are responsible for producing and releasing pollen, which is essential for the process of pollination and fertilization in plants. Therefore, it makes sense that the correct answer to the question about the location of anthers is the flower, as they are a crucial component of the flower's reproductive system.
50.

Adipose connective tissues are ones which store what substance?

Answer: Fat
Explanation:
Adipose connective tissues are specialized for storing fat, which serves as a source of energy, insulation, and protection for organs in the body. These tissues are made up of adipocytes, which are cells that primarily contain triglycerides, the main form of fat stored in the body.
51.

Adenine, guanine, cytosine and thymine are the nucleotide bases that combine to create what?

Answer: DNA
Explanation:
These nucleotide bases combine to create DNA, which is a molecule found in the cells of all living organisms and contains the genetic instructions for the development, functioning, growth, and reproduction of those organisms. DNA is composed of two strands that twist around each other in a double helix structure, with adenine pairing with thymine and guanine pairing with cytosine to form the building blocks of the genetic code.
52.

What is the body's defense against disease and germs called?

Answer: Immunity
Explanation:
The body's defense against disease and germs is called immunity, which is the ability of the body to resist or fight off harmful pathogens such as bacteria, viruses, and parasites. Immunity is achieved through a complex system involving various cells, tissues, and organs that work together to recognize and eliminate foreign invaders, thereby protecting the body from infections and diseases.
53.

Which forearm bone runs alongside the thumb?

Answer: Radius
Explanation:
The radius is the forearm bone that runs alongside the thumb. It is located on the same side as the thumb and is one of the two bones in the forearm, the other being the ulna. The radius is responsible for allowing the hand to rotate and move in various directions, making it an important bone for overall arm function and mobility.
54.

A butterfly's life cycle consists of how many stages?

Answer: Four
Explanation:
A butterfly's life cycle consists of four stages: egg, larva (caterpillar), pupa (chrysalis), and adult. Each stage serves a specific purpose in the development and transformation of the butterfly from an egg to a fully grown adult capable of reproduction.
55.

What is the shorter term for the International System of Units?

Answer: SI
Explanation:
The International System of Units is commonly referred to as SI, which stands for Système International d'Unités in French. This abbreviation is widely used in scientific and technical fields to represent the standardized system of measurement units used worldwide.
56.

Where is blood made?

Answer: Bone Marrow
Explanation:
Bone marrow is the soft, spongy tissue found inside bones where blood cells are produced. It is responsible for the production of red blood cells, white blood cells, and platelets, which are essential for bodily functions such as oxygen transport, immune system function, and blood clotting. The bone marrow contains stem cells that can develop into different types of blood cells, making it a crucial site for blood cell production in the body.
57.

What are the tiny openings in your skin?

Answer: Pores
Explanation:
Pores are the tiny openings in the skin that allow sweat and oils to reach the surface. They also help regulate body temperature and keep the skin hydrated. Keeping pores clean and unclogged is important for maintaining healthy skin and preventing issues such as acne.
58.

What do white blood cells make to help fight off infection?

Answer: Antibodies
Explanation:
White blood cells produce antibodies to help fight off infections by recognizing and binding to foreign substances, such as bacteria or viruses. This binding marks the invaders for destruction by other immune cells, enhancing the body's ability to defend against infections. Antibodies are a crucial component of the immune response and play a key role in protecting the body from harmful pathogens.
59.

What process breaks food into nutrients?

Answer: Digestion
Explanation:
Digestion is the process by which food is broken down into nutrients that can be absorbed by the body. This process involves the mechanical and chemical breakdown of food in the digestive system, specifically in the stomach and intestines. Enzymes and acids help to break down proteins, fats, and carbohydrates into smaller molecules that can be easily absorbed by the body for energy and growth.
60.

What substance makes human blood bright red?

Answer: Oxygen
Explanation:
When oxygen is present in the blood, it combines with hemoglobin in red blood cells to form oxyhemoglobin, which gives blood its bright red color. This oxygenated blood is then transported throughout the body to deliver oxygen to tissues and organs, allowing them to function properly.
61.

What word means animal life?

Answer: Fauna
Explanation:
Fauna refers to the animal life of a particular region or period. It is derived from the Latin word for "animals." This term is commonly used in biology and ecology to categorize and study the animal species present in a specific area.
62.

What snail-shaped ear part funnels sound to the auditory nerve?

Answer: Cochlea
Explanation:
The cochlea is a spiral-shaped, snail-like structure in the inner ear responsible for converting sound vibrations into electrical signals that are sent to the brain via the auditory nerve. It plays a crucial role in the process of hearing by funneling sound waves and translating them into signals that the brain can interpret.
63.

What tiny blood vessels connect arteries and veins?

Answer: Capillaries
Explanation:
Capillaries are tiny blood vessels that connect arteries and veins, allowing for the exchange of oxygen, nutrients, and waste products between the blood and surrounding tissues. These small vessels play a crucial role in the circulatory system by facilitating the delivery of essential substances to cells and removing waste products from the body.
64.

What regulates what comes in and out of a cell?

Answer: Cell Membrane
Explanation:
The cell membrane is a semi-permeable barrier that controls the movement of substances in and out of the cell. It is made up of a phospholipid bilayer with embedded proteins that selectively allow certain molecules to pass through while blocking others. This regulation of what enters and exits the cell is crucial for maintaining internal balance and allowing cells to function properly.
65.

Which adaptation lets an animal blend in with its surroundings?

Answer: Camouflage
Explanation:
Camouflage is an adaptation that allows an animal to blend in with its surroundings, making it less noticeable to predators or prey. This adaptation helps the animal to avoid detection, increasing its chances of survival in its natural habitat. Animals use camouflage to hide from predators, sneak up on prey, or avoid being seen while they hunt. This adaptation can involve changes in color, pattern, or texture to match the environment, helping the animal to remain undetected and safe.
66.

What does melanin control?

Answer: Color Of The Skin
Explanation:
Melanin is a pigment produced by cells called melanocytes in the skin. It is responsible for determining the color of the skin, hair, and eyes. The more melanin produced, the darker the skin color will be. Melanin also helps protect the skin from the harmful effects of UV radiation from the sun by absorbing and dissipating the radiation.
67.

What is the voice box also called?

Answer: Larynx
Explanation:
The voice box is also known as the larynx because it is the organ in the neck that produces sound through the vibration of vocal cords. It is responsible for controlling the pitch and volume of the voice, as well as protecting the airway during swallowing.
68.

How many lobes are in the human brain?

Answer: Four
Explanation:
The human brain is divided into four main lobes: the frontal lobe, parietal lobe, occipital lobe, and temporal lobe. Each lobe is responsible for different functions such as motor skills, sensory processing, visual processing, and auditory processing. These lobes work together to enable various cognitive functions and behaviors in humans.
69.

Through what does most oxygen enter the human body?

Answer: Trachea
Explanation:
Oxygen enters the human body through the trachea, which is a tube that connects the throat to the lungs. The trachea allows air to pass in and out of the lungs, providing oxygen to the body for cellular respiration. This process is essential for sustaining life and providing the necessary oxygen for bodily functions.
70.

What nerve transmits sound signals to your brain?

Answer: Auditory
Explanation:
The auditory nerve is responsible for transmitting sound signals from the inner ear to the brain. This nerve plays a crucial role in the process of hearing, as it carries the information about sound waves to the brain where they are interpreted and processed.
71.

Which sense tells you what color something is?

Answer: Sight
Explanation:
The sense of sight allows us to perceive and differentiate between different colors. Our eyes contain specialized cells that detect different wavelengths of light, which are then interpreted by the brain as various colors. This sense enables us to see the world in vibrant hues and distinguish between the countless shades and tones that make up our visual experience.
72.

What long strands of genetic material are in a cell's nucleus?

Answer: Chromatin
Explanation:
Chromatin is the long strands of genetic material found in a cell's nucleus. It is made up of DNA and proteins, and its main function is to package the DNA into a more compact form to fit inside the nucleus and regulate gene expression. Chromatin plays a crucial role in various cellular processes such as DNA replication, transcription, and repair.
73.

What is the liquid in your mouth that helps soften food?

Answer: Saliva
Explanation:
Saliva is the liquid in your mouth that helps soften food by breaking down carbohydrates and lubricating the food particles to make them easier to swallow. Saliva also contains enzymes that start the digestion process by breaking down food molecules.
74.

What is the largest artery in the human body?

Answer: Aorta
Explanation:
The aorta is the largest artery in the human body as it is responsible for carrying oxygen-rich blood from the heart to the rest of the body. It is a vital part of the circulatory system and plays a crucial role in maintaining blood flow and distributing nutrients throughout the body.
75.

What do we call all of our bones, collectively?

Answer: Skeleton
Explanation:
Our bones collectively form the structure known as the skeleton, which provides support, protection, and enables movement for our bodies. The skeleton is made up of various bones that are interconnected and work together to support the body's functions.
76.

What directly affects all cell activity?

Answer: Stimulus
Explanation:
Stimulus directly affects all cell activity by triggering a response or change in the cell. This can include changes in membrane potential, gene expression, or protein synthesis, among other cellular processes. Stimuli can come from the external environment or from within the cell itself, and can result in a variety of cellular responses depending on the type and intensity of the stimulus.
77.

What blood components help clotting?

Answer: Platelets
Explanation:
Platelets are blood components that play a crucial role in clotting. They are small cell fragments that help in the formation of blood clots by sticking together at the site of an injury to stop bleeding. Platelets release proteins and other substances that initiate the clotting process and form a plug to seal the wound. Without enough platelets, a person may experience excessive bleeding and have difficulty forming clots to stop bleeding.
78.

What is left after cells are removed from blood?

Answer: Plasma
Explanation:
When cells are removed from blood, what remains is the liquid component of blood known as plasma. Plasma is a yellowish fluid that makes up about 55% of blood volume and contains water, electrolytes, hormones, gases, and proteins. It plays a crucial role in transporting nutrients, hormones, and waste products throughout the body, as well as maintaining blood pressure and pH balance.
79.

What is an automatic response called?

Answer: Reflex
Explanation:
An automatic response to a stimulus is called a reflex. This type of response is involuntary and does not require conscious thought or decision-making. Reflexes are essential for the body to react quickly to potential dangers or to maintain basic functions without the need for conscious control.
80.

What is an algal bloom in salt water called?

Answer: Red Tide
Explanation:
An algal bloom in salt water is commonly referred to as a Red Tide due to the discoloration of the water caused by the rapid growth of algae, specifically certain species of phytoplankton. This phenomenon can result in the release of toxins harmful to marine life and humans, as well as deplete oxygen levels in the water, leading to negative environmental impacts.
81.

What controls activity inside a cell?

Answer: Nucleus
Explanation:
The nucleus controls the activity inside a cell by containing the cell's genetic material, including DNA, which carries instructions for the cell's functions. It regulates the cell's growth, metabolism, and reproduction by directing the synthesis of proteins and coordinating various cellular processes. Additionally, the nucleus plays a crucial role in gene expression and cell division, ensuring proper functioning and maintenance of the cell.
82.

Some living things produce light because of what?

Answer: Bioluminescence
Explanation:
Some living things produce light through a process called bioluminescence, which is the production and emission of light by a living organism. This phenomenon is often seen in various marine organisms such as jellyfish, fish, and plankton, as well as some insects and fungi. Bioluminescence is typically produced through a chemical reaction involving luciferin and an enzyme called luciferase, resulting in the emission of light. This adaptation serves various purposes such as attracting prey, communication, camouflage, and defense mechanisms.
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