Transport in Plants Practice Questions

The graph above shows the water uptake and water loss by a plant over a period of 24 hours.
(a) Describe the relationship between water uptake and water loss. [1]

(b) Name the process through which water is lost to the atmosphere. [1]

(c) Between which hours does water loss exceed water uptake? [1]

(d) Between which hours does the plant have the highest water uptake and water loss? [1]

(e) Suggest a reason why the highest water loss occurs at this time. [1]

(f) State what would happen to the plant if water loss continues to exceed water uptake. [1]

ANSWERS
(a) As water loss increases, water uptake also increases ; / as water loss decreases, water uptake also decreases ;
(b) Transpiration ;
(c) 6.30 am to 8.00 pm ;
(d) Around 3.00 pm to 4.00 pm ;
(e) Due to high temperature which increases rate of diffusion and hence rate of transpiration ;
(f) Cells in plant lose turgor/ become flaccid, leaves will start to droop, wilting occurs ;