Chapter 21 Quiz 1

Complete the word equation for photosynthesis.

(a)________________ + water → glucose + (b)________________

• (a) oxygen；(b) carbon dioxide

• (a) carbon dioxide；(b) oxygen

Which of the following are importances of chlorophyll in photosynthesis?

(1) To absorb light energy

(2) To absorb carbon dioxide

(3) To drive the synthesis of organic molecules

• (1) and (2) only

• (1) and (3) only

• (2) and (3) only

• (1), (2) and (3)

Arrange in the correct order the following steps for testing the presence of starch in the leaves of a plant.

(1) Add iodine solution.

(2) Put the leaves in hot alcohol for five minutes.

(3) Put the leaves in boiling water for five minutes.

(4) Put the leaves in water at room temperature for a few seconds.

• (2), (3), (4), (1)

• (2), (4), (3), (1)

• (3), (2), (4), (1)

• (3), (4), (2), (1)

Which of the following correctly describes the stroma of chloroplasts?

• disc-shaped membrane structures; chlorophyll is found on the membranes

• a transparent layer of cells that allows light to reach the inner parts of the leaf

• contains enzymes for catalysing photosynthetic reactions

• a waxy layer that prevents water loss from leaves

Which of the following correctly describes the thylakoid?

• disc-shaped membrane structure; chlorophyll is found on the membranes

• a transparent layer of cells that allows light to reach the inner parts of the leaf

• contains enzymes for catalysing photosynthetic reactions

• a waxy layer that prevents water loss from leaves

Which of the following correctly describes the cuticle?

• a transparent layer of cells that allows light to reach the inner parts of the leaf

• a waxy layer that prevents water loss from leaves

• composed of closely packed cells with numerous chloroplasts to absorb light

• composed of loosely packed cells with lots of air spaces to allow gases to diffuse freely

Which of the following correctly describes the leaf epidermis?

• a transparent layer of cells that allows light to reach the inner parts of the leaf

• a waxy layer that prevents water loss from leaves

• composed of closely packed cells with numerous chloroplasts to absorb light

• composed of loosely packed cells with lots of air spaces to allow gases to diffuse freely

Which of the following correctly describes the spongy mesophyll?

• a transparent layer of cells that allows light to reach the inner parts of the leaf

• a waxy layer that prevents water loss from leaves

• composed of closely packed cells with numerous chloroplasts to absorb light

• composed of loosely packed cells with lots of air spaces to allow gases to diffuse freely

Which of the following correctly describes the palisade mesophyll?

• a transparent layer of cells that allows light to reach the inner parts of the leaf

• a waxy layer that prevents water loss from leaves

• composed of closely packed cells with numerous chloroplasts to absorb light

• composed of loosely packed cells with lots of air spaces to allow gases to diffuse freely