1.
A special cell that develops into a new living thing is a
Correct Answer
D. Spore
Explanation
A spore is a special cell that has the ability to develop into a new living thing. Spores are typically produced by fungi, plants, and some bacteria as a means of reproduction and dispersal. They are highly resistant to harsh environmental conditions and can remain dormant for long periods of time until conditions become favorable for growth. Once conditions are suitable, spores can germinate and develop into a new organism. Therefore, a spore is the correct answer as it fits the description of a special cell that can develop into a new living thing.
2.
Which of the following is not a member of the protist kingdom?
Correct Answer
A. Bacteria
Explanation
Bacteria is not a member of the protist kingdom because bacteria belong to a separate kingdom called the Monera. Protists are eukaryotic organisms that have a nucleus and membrane-bound organelles, while bacteria are prokaryotic organisms that lack a nucleus and membrane-bound organelles.
3.
Which cell part is not found in an amoeba?
Correct Answer
C. Cell wall
Explanation
Amoebas are single-celled organisms that belong to the group of protists. Unlike plant cells, amoebas do not possess a cell wall. Instead, they have a flexible and dynamic cell membrane that allows them to change shape and move. The absence of a cell wall in amoebas enables them to engulf and consume food particles by extending their pseudopods. Therefore, the correct answer is cell wall.
4.
A living thing, usually with one cell that has a nucleus and other cell parts, is a
Correct Answer
B. Protist
Explanation
A protist is a living thing that can be composed of a single cell with a nucleus and other cell parts. This category includes various organisms such as algae, amoebas, and paramecia. Unlike monerans, which are prokaryotic organisms without a nucleus, protists have a more complex cellular structure. Viruses are not considered living organisms as they lack cellular structure and can only replicate inside host cells. Fungi are also multicellular organisms with a distinct cellular structure, making protist the most suitable answer.
5.
In one stage of its life cycle, the slime mold flows like a(n)
Correct Answer
C. Amoeba
Explanation
The correct answer is amoeba because amoebas are known for their ability to move by extending their cytoplasm in a flowing motion, which is similar to the movement of slime molds in one stage of their life cycle. Amoebas use pseudopods to propel themselves forward, allowing them to change direction and navigate their environment. This characteristic makes amoebas a suitable comparison for the movement of slime molds in this particular stage of their life cycle.
6.
Malaria is caused by
Correct Answer
D. A sporozoan
Explanation
Malaria is caused by a sporozoan. Malaria is a parasitic disease that is transmitted to humans through the bite of infected female Anopheles mosquitoes. The parasite responsible for malaria is called Plasmodium, which is a sporozoan. It enters the human bloodstream through the mosquito bite and travels to the liver, where it multiplies and matures. From the liver, it infects red blood cells, leading to the symptoms of malaria. Therefore, the correct answer is a sporozoan.
7.
This plant-like protist can be mutlicellular and has a complex life cycle
Correct Answer
D. Green algae
Explanation
Green algae is the correct answer because it is a plant-like protist that can be multicellular and has a complex life cycle. Green algae are photosynthetic organisms that can range in size from single-celled to multicellular forms. They have a complex life cycle that involves both sexual and asexual reproduction. Green algae can be found in various habitats, including freshwater, marine environments, and even on land. Therefore, green algae fits the description given in the question.
8.
All animal-like protists are mobile
Correct Answer
B. This statement is false
Explanation
The statement is false because not all animal-like protists are mobile. While many animal-like protists, such as amoebas and paramecia, are indeed mobile, there are also non-mobile animal-like protists, such as sporozoans. These protists are parasitic and live inside the bodies of other organisms, relying on their hosts for movement. Therefore, it is incorrect to claim that all animal-like protists are mobile.
9.
Which of the following organisms uses cilia to move?
Correct Answer
D. Paramecium
Explanation
Paramecium uses cilia to move. Cilia are hair-like structures that cover the surface of the organism and beat in coordinated waves, allowing it to move through its environment. Euglena uses a whip-like tail called a flagellum to move, while amoeba uses pseudopods or "false feet" to crawl. Dinoflagellates also have flagella for movement. Therefore, out of the given options, paramecium is the only organism that uses cilia for locomotion.
10.
Which of the following protists cause disease?
Correct Answer
E. All of the above
Explanation
All of the listed protists (plasmodium, amoeba, trypanosomes, giardia) are known to cause diseases. Plasmodium is responsible for causing malaria, amoeba can cause amoebic dysentery, trypanosomes are responsible for diseases like African sleeping sickness, and giardia can cause giardiasis. Therefore, all of the above protists are known to cause diseases.
11.
Algae are important to humans because
Correct Answer
D. All of the above
Explanation
Algae are important to humans because they provide us with oxygen through photosynthesis, which is essential for our survival. Additionally, algae are a source of food for humans, as they are used in various forms such as seaweed in sushi and as a nutritional supplement. Furthermore, algae serve as a vital food source for other animals in aquatic ecosystems, supporting the entire food chain. Therefore, all of the above statements are correct, highlighting the significance of algae to humans and the environment.
12.
Red tide is caused by
Correct Answer
C. Dinoflagellates
Explanation
Red tide is caused by the presence of dinoflagellates. These are single-celled organisms that can produce toxins, leading to the discoloration of water and the formation of a red tide. Dinoflagellates are a type of plankton and are known to undergo population explosions, resulting in the formation of large blooms. These blooms can be harmful to marine life, as the toxins produced by dinoflagellates can be detrimental to fish, shellfish, and other organisms in the water. Therefore, dinoflagellates are the main cause of red tide occurrences.
13.
A green organism and a fungus living together is a
Correct Answer
B. Lichen
Explanation
A lichen is a correct answer because it is a symbiotic relationship between a green organism (usually an alga or a cyanobacterium) and a fungus. The fungus provides structure and protection, while the green organism provides food through photosynthesis. This mutualistic relationship allows lichens to survive in harsh environments and colonize a variety of substrates.
14.
A _____ is an example of a fungus.
Correct Answer
C. Mushroom
Explanation
A mushroom is an example of a fungus because mushrooms are the fruiting bodies of certain types of fungi. Fungi are a distinct kingdom of organisms that include mushrooms, yeasts, molds, and other types of fungi. They obtain nutrients by decomposing organic matter and play important roles in ecosystems as decomposers. Mushrooms are specifically the reproductive structures of some fungi, releasing spores that can germinate and grow into new fungal organisms. Therefore, a mushroom is a specific example of a fungus.
15.
Ringworm and athletes foot are caused by
Correct Answer
C. Fungi
Explanation
Ringworm and athlete's foot are both common fungal infections. Fungi are microscopic organisms that can invade the skin, hair, and nails, causing various types of infections. Bacteria and viruses are different types of microorganisms that cause different types of infections, but they are not responsible for ringworm or athlete's foot. Protists, on the other hand, are a group of eukaryotic microorganisms that include protozoa and algae, and they are not known to cause ringworm or athlete's foot either. Therefore, the correct answer for the cause of ringworm and athlete's foot is fungi.
16.
Fungi used to make bread and alcohol are
Correct Answer
D. Yeasts
Explanation
Yeasts are used to make bread and alcohol because they are a type of fungi that can ferment sugars into alcohol and carbon dioxide through a process called fermentation. In bread-making, yeast is added to the dough to produce carbon dioxide gas, which causes the dough to rise. In alcohol production, yeasts convert the sugars in fruits or grains into alcohol, resulting in the fermentation process that produces beer, wine, and other alcoholic beverages. Mushrooms, rusts, and mildew are different types of fungi that do not have the same ability to ferment sugars and are not commonly used in bread or alcohol production.
17.
All fungi ___
Correct Answer
D. Both "a" and "b" are correct
Explanation
Fungi are organisms that have cell walls, which provide structure and support to their cells. Additionally, fungi are unable to produce their own food through photosynthesis, unlike plants. Instead, they obtain nutrients by breaking down organic matter in their environment. Therefore, both statements "a" and "b" are correct.
18.
Yeasts are an unusual sac-fungus in that they reproduce by___
Correct Answer
D. Budding
Explanation
Yeasts are an unusual sac-fungus because they reproduce through budding. Budding is a form of asexual reproduction where a small outgrowth or bud forms on the parent cell and eventually separates to become a new individual. This process allows yeasts to rapidly multiply and colonize their surroundings. Unlike fission, which involves the splitting of a parent cell into two equal parts, budding involves the formation of a smaller offspring that gradually grows in size before detaching. Sexual reproduction and fermentation are not the primary methods of reproduction for yeasts.