Grade 8 Cells And Systems Quiz
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Do you like studying science? Do you have good knowledge of human body cells? Try this grade 8 cell quiz that we've prepared below to check your understanding of human body cells and their related concepts. Crafted with care, each question aims to test your knowledge, reinforce learning, and ignite a passion for the life sciences.
From the structure and function of cell organelles to the intricate workings of the human body's systems, this quiz covers all essential topics in an engaging and interactive format. As you progress, you'll encounter a mix of multiple-choice questions, true/false statements, and short Read moreanswer challenges designed to cater to different learning styles and encourage critical thinking.
The questions of this test will be based on the Grade 8 science syllabus, and students who understand this topic can ace this quiz easily. So, let's start this grade 8 cell test and see if you can pass it or not. Best of luck!
Grade 8 Cells And Systems Questions and Answers
- 1.
Which of the following statements about the cell nucleus is FALSE?
- A.
The nucleus controls all activity in the cell.
- B.
The nucleus carries DNA.
- C.
The bacterial cell has no nucleus.
- D.
The nuclear membrane connects with the endoplasmic reticulum.
Correct Answer
C. The bacterial cell has no nucleus.Explanation
Bacterial cells are prokaryotic, meaning they lack a true nucleus and other membrane-bound organelles. Their DNA is located in a region called the nucleoid, but it's not enclosed within a membrane. The other statements are true: the nucleus acts as the control center of eukaryotic cells, DNA is housed within the nucleus, and the nuclear membrane is continuous with the endoplasmic reticulum in eukaryotic cells.Rate this question:
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- 2.
A ___________________ organism has only one cell.
Correct Answer
unicellularExplanation
An organism that is unicellular means that it is composed of only one cell. This type of organism is simple in structure and function, as all of its life processes occur within a single cell. Examples of unicellular organisms include bacteria, archaea, and some types of algae. They are capable of performing all necessary functions for survival, such as obtaining nutrients, reproducing, and responding to their environment, within their single cell.Rate this question:
- 3.
Which is a function of the mitochondria?
- A.
Carries DNA
- B.
Stores wastes
- C.
Convert food energy to ATP energy for the cell
- D.
Stores proteins
Correct Answer
C. Convert food energy to ATP energy for the cellExplanation
Mitochondria are known as the powerhouses of the cell because their main function is to generate energy in the form of ATP through cellular respiration. This process occurs in the inner membrane of the mitochondria, where electrons from food molecules are transferred through a series of reactions, ultimately producing ATP. Therefore, the correct answer is “converts food energy to ATP energy for the cell."Rate this question:
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- 4.
Which of the following organelles is primarily responsible for producing energy in both plant and animal cells?
- A.
Ribosomes
- B.
Nucleus
- C.
Mitochondria
- D.
Lysosomes
Correct Answer
C. MitochondriaExplanation
The mitochondria are known as the "powerhouses" of the cell because they generate ATP (adenosine triphosphate), the cell's main energy currency, through cellular respiration. This process occurs in both plant and animal cells. Ribosomes synthesize proteins, the nucleus controls cellular activities by housing DNA, and lysosomes break down waste, but it is the mitochondria that are crucial for energy production in eukaryotic cells, making them essential for cell survival and function.Rate this question:
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- 5.
Which of the following is not present in an animal cell?
- A.
Vacuole
- B.
Cell Wall
- C.
Lysosomes
- D.
Golgi Body
Correct Answer
B. Cell WallExplanation
The cell wall is not present in an animal cell. While both plant and fungal cells have a rigid cell wall made of cellulose, animal cells lack this structure. Animal cells are surrounded by a flexible plasma membrane that allows for movement and flexibility. The absence of a cell wall in animal cells enables them to change shape and move more freely compared to plant cells.Rate this question:
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- 6.
Bacteria are
- A.
Eukaryotic cells
- B.
Prokaryotic cells
- C.
Are always sphere-shaped
- D.
Are always spiral-shaped
Correct Answer
B. Prokaryotic cellsExplanation
The correct answer is "Prokaryotic cells." Bacteria are prokaryotic cells because they lack a nucleus and other membrane-bound organelles. Prokaryotic cells are generally smaller and simpler in structure compared to eukaryotic cells, which have a true nucleus and other membrane-bound organelles. Bacteria can have various shapes, including sphere-shaped (cocci), spiral-shaped (spirilla), and rod-shaped (bacilli), but their cell type remains prokaryotic regardless of their shape.Rate this question:
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- 7.
____________ is the diffusion of water particles through a selectively permeable membrane.
Correct Answer
OsmosisExplanation
The diffusion of water particles through a selectively permeable membrane is called "osmosis." Osmosis is a specific type of diffusion that involves the movement of water molecules across a membrane from an area of lower solute concentration to an area of higher solute concentration, or vice versa, in an attempt to equalize the concentration on both sides of the membrane. This process is essential for many biological and cellular functions.Rate this question:
- 8.
An example of a response to a stimulus is
- A.
Answering this question
- B.
Blinking when a bright light is shone on your face
- C.
Staring at a blank TV screen
- D.
Waking up naturally in the morning
Correct Answer
B. Blinking when a bright light is shone on your faceExplanation
Blinking when a bright light is shone on your face is an example of a response to a stimulus because it is an automatic reflex action that occurs in response to the stimulation of the optic nerves by the sudden increase in light intensity. This reflex helps protect the eyes from potential damage caused by excessive light.Rate this question:
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- 9.
________ is a cell in which there are very few organelles, and those organelles are NOT enclosed in a membrane.
Correct Answer
prokaryotic, prokaryotes, Prokaryotes, Prokaryotic, Prokaryotic cellExplanation
A prokaryotic cell is a cell in which there are very few organelles, and those organelles are not enclosed in a membrane. Prokaryotic cells are typically found in bacteria and archaea, and they lack a nucleus and other membrane-bound organelles found in eukaryotic cells. This type of cell is characterized by its simplicity and smaller size compared to eukaryotic cells.Rate this question:
- 10.
Cells extract energy from their food by means of
- A.
Chlorophyll
- B.
Photosynthesis
- C.
Cellular respiratation
- D.
Osmosis
Correct Answer
C. Cellular respiratationExplanation
Cells extract energy from their food through cellular respiration. This process involves breaking down glucose molecules in the presence of oxygen to produce ATP, which is the main energy currency of cells. Cellular respiration occurs in the mitochondria of eukaryotic cells and involves a series of enzymatic reactions that release energy stored in the chemical bonds of glucose. Chlorophyll and photosynthesis are related to the process of converting sunlight into chemical energy in plants, while osmosis is the movement of water across a semipermeable membrane and is not directly involved in energy extraction.Rate this question:
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Oct 22, 2024Quiz Edited by
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Jun 16, 2010Quiz Created by
Mary Rose