Question

9)Plant cells ________.

a)use carbon dioxide but do not use oxygen

b)do not need mitochondria because their chloroplasts meet their energy needs

c)have chloroplasts and mitochondria

d)do not need chloroplasts because their mitochondria meet their energy needs

10)Eukaryotic cells have their chromosomes packaged in the

a)a measure of calories

b)a measure of calories

c)the capacity to cause movement

d)a measure of disorder

11)Which environments would be best for the functioning of animal and plant cells?

a)A hypotonic environment for plant cells and an isotonic environment for animal cells

b)An isotonic environment for both plant and animal cells.

c)A hypotonic environment for animal cells and an isotonic environment for plant cells

12)How many chromosomes does an individual with Klinefelter Syndrome have?

a)45

b)24

c)46

d)47

Answer 1

9. C

First option is incorrect because plant cells use carbon dioxide during photosynthesis and oxygen during respiration. Second option is incorrect because they have both mitochondria and photosynthesis. Mitochondria is responsible for undertaking cellular respiration and chloroplast is responsible for undertaking photosynthesis. Third option is correct because both chloroplast and mitochondria are present in plant cell. Fourth option is incorrect because they need both chloroplast and mitochondria to survive.

10. Incorrect options

11. B

An isotonic environment is the one in which the amount of water entering the cell is equal to the amount of water leaving the cell. This would be the best for the functioning of a plant and animal cell.

A cell kept in hypotonic solution will game water due to the entry of water into the cell. Therefore the cell made burst.

A cell kept in hypertonic solution will lose water and shrink. Both swollen and shrinked cells would not be able to perform their activities.

12. 47

Klinefelter is XXY. One extra X chromosome is present.

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