Transpiration, Translocation & Plant Structure

Question 1

What do the phloem cells do?

Answer 1

Transport sugars from the leaves to the rest of the plant

Question 2

What do the xylem cells do?

Answer 2

Transport water and minerals ions from roots to leaves

Question 3

What is transpiration?

Answer 3

Evaporation of water from leaves

Question 4

Give 4 factors that affect transpiration?

Answer 4

1) Light Intensity
2) Temperature
3) Air Flow
4) Humidity

Question 5

Where does CO2 diffuse through in a leaf?

Answer 5

Stomata

Question 6

Why is there lots of space between cells in the spongy mesophyll?

Answer 6

Allows for easy airflow and diffusion into the palisade mesophyll

Question 7

What is the waxy cuticle and what’s its purpose?

Answer 7

A thing layer of lipids… stops water inside passing through

Question 8

What happens to the stomata when there’s lots of water in the leaf?

Answer 8

Stomata open wide (turgid) to maximise CO2 diffusion

Question 9

What happens to the stomata when there isn’t much water in the leaf?

Answer 9

Stomata become flaccid (close), conserving water vapour

Question 10

Why do the stomata close at night time?

Answer 10

They aren’t photosynthesising so don’t need CO2, thus minimising water loss

Question 11

Why are the stomata located on the underside of the plant?

Answer 11

Because it’s cooler so less water will evaporate