Quiz · Grade 6 · Science
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Q1. Which organelle is known as the 'powerhouse of the cell' because it produces energy?
Answer: Mitochondria
Explanation: Mitochondria produce ATP (energy) through cellular respiration, earning the nickname 'powerhouse of the cell.'
Q2. The cell membrane controls what substances enter and exit the cell.
Answer: true
Explanation: The cell membrane is selectively permeable, meaning it regulates the movement of materials in and out of the cell.
Q3. What is the main function of the nucleus in a cell?
Answer: To control the cell's activities and contain DNA
Explanation: The nucleus acts as the control center of the cell and houses the cell's genetic material (DNA).
Q4. Both plant cells and animal cells have a cell wall.
Answer: false
Explanation: Only plant cells have a cell wall. Animal cells have only a cell membrane but no cell wall.
Q5. Which organelle is responsible for making proteins in the cell?
Answer: Ribosome
Explanation: Ribosomes are the sites of protein synthesis, reading instructions from DNA to build proteins.
Q6. The vacuole in a plant cell is typically much larger than the vacuole in an animal cell.
Answer: true
Explanation: Plant cells have a large central vacuole that stores water and helps maintain the cell's shape, while animal cells have smaller, less prominent vacuoles.
Q7. The Golgi apparatus can best be compared to which of the following?
Answer: A post office that packages and ships materials
Explanation: The Golgi apparatus packages, modifies, and ships proteins and other materials to their correct destinations inside or outside the cell.
Q8. Chloroplasts are found in both plant cells and animal cells.
Answer: false
Explanation: Chloroplasts are found only in plant cells and some algae. They contain chlorophyll and are responsible for photosynthesis.
Q9. What substance do chloroplasts use to capture energy from sunlight?
Answer: Chlorophyll
Explanation: Chlorophyll is the green pigment inside chloroplasts that absorbs light energy used during photosynthesis.
Q10. The endoplasmic reticulum helps transport materials throughout the cell.
Answer: true
Explanation: The endoplasmic reticulum (ER) is a network of membranes that acts like a highway, transporting proteins and other substances within the cell.
Q11. Which organelle breaks down and digests old cell parts and foreign materials?
Answer: Lysosome
Explanation: Lysosomes contain digestive enzymes that break down waste materials, old cell parts, and foreign substances.
Q12. The cell wall of a plant cell is located inside the cell membrane.
Answer: false
Explanation: The cell wall is located outside the cell membrane. It provides extra support and protection for the plant cell.
Q13. Why is the cell membrane described as 'selectively permeable'?
Answer: Because it allows only certain substances to pass through
Explanation: Selectively permeable means the cell membrane can choose which substances to let in or out, controlling the cell's internal environment.
Q14. Mitochondria are found in both plant cells and animal cells.
Answer: true
Explanation: Both plant and animal cells need energy, so both contain mitochondria to carry out cellular respiration.
Q15. A student notices that a plant cell has a rigid outer boundary that an animal cell does not have. What structure is the student observing?
Answer: Cell wall
Explanation: The cell wall is a rigid structure found only in plant cells that provides shape and structural support.
Q16. The nucleus contains the cell's DNA, which carries instructions for how the cell should function.
Answer: true
Explanation: DNA stored in the nucleus contains the genetic instructions that direct all of the cell's activities and functions.
Q17. Which of the following best explains why plant cells are green?
Answer: Their chloroplasts contain a green pigment called chlorophyll
Explanation: Chlorophyll, the green pigment in chloroplasts, gives plants their green color and absorbs light for photosynthesis.
Q18. Ribosomes can be found floating freely in the cytoplasm or attached to the endoplasmic reticulum.
Answer: true
Explanation: Ribosomes exist in two locations: free in the cytoplasm or attached to the rough endoplasmic reticulum, where they produce proteins.
Q19. If the mitochondria in a cell stopped working, what would most likely happen?
Answer: The cell would not be able to produce energy
Explanation: Mitochondria produce ATP, the energy currency of the cell. Without functioning mitochondria, the cell would run out of energy to perform its functions.
Q20. The cytoplasm is the jelly-like fluid that fills the cell and surrounds the organelles.
Answer: true
Explanation: Cytoplasm is the gel-like substance that fills the cell, suspending organelles and allowing materials to move throughout the cell.
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