transpiration

1. 1. where does the loss of water vapour mainly occur during transpiration?

• a. stem  

• b. leaves

• c. roots

• d. all of the above

 2. where does this loss of water causes water to be taken up by?

• a. stem

• b. leaves

• c. roots

• d. none of the above

3. what is the constant flow of water from the roots through the stem and xylem vessels and out of the leaves

• a. diffusion

• b. transpiration stream

• c. photosynthesis

• d. osmosis

4. what is the function of transpiration?

• a. upward movement of water in plants

• b. downward movement of water in plants

• c. to transport nutrients

• d. to release sugar

5. what causes transpiration?

• a) evaporation of air at the leaf 

• b. lack of water

• c. lack of heat

• d. evaporation of water in the leaf

6. What does it mean by the word  : guard cell ? 

• a. are cells surrounding each stomata .

• b. are animal cells

• c. are cells that occurs in xylem vessels

• d. none of the above

 7. What are holes on the underside of the leaf ? 

• a. open stomata

• b. guard cell

• c. stomata

• d. close stomata

8. Water vapour is lost from the leaves by :

• a. translocation

• b. transpiration

• c. evaporation

• d. translucent

9.  Water moves into the roots from the soil by :

• a. transpiration

• b. diffusion

• c. osmosis

• d. active transport

10. The loss of water from the leaves reduces the pressure at the top of the : 

• a. root

• b. phloem vessels

• c. leaf

• d. xylem vessels