21. Which of the following statements is false?

Answer: B

Explanation:

Animal cells use chloroplasts to gain energy is false.

Animal cells do not contain chloroplasts, which are organelles responsible for photosynthesis. Instead, they rely on mitochondria to produce energy.

A) Animal cells use lysosomes to break down old cells

This statement is true. Lysosomes are membrane-bound organelles in animal cells that contain enzymes to digest cellular waste and break down old or damaged cells.

B) Animal cells use chloroplasts to gain energy

This statement is false. Unlike plant cells, which contain chloroplasts for photosynthesis, animal cells do not have chloroplasts and instead generate energy through mitochondria.

C) Plant cells have a cell wall to maintain structure

This statement is true. Plant cells possess a rigid cell wall made of cellulose that provides structural support and protection, distinguishing them from animal cells.

D) All of the above are true

This statement is false. Since statement B is incorrect, asserting that all statements are true is also incorrect.

Conclusion

The false statement is that animal cells use chloroplasts to gain energy, as they do not possess chloroplasts. Options A and C are accurate descriptions of cell structures and functions in animal and plant cells, respectively. Therefore, the correct identification of the false statement demonstrates an understanding of cell biology and the differences between animal and plant cells.