MEDIUM
AS and A Level
IMPORTANT
Earn 100
Explain how pits adapts xylem vessels for their function of transporting water from roots to leaves.
Important Questions on Transport in Plants
MEDIUM
AS and A Level
IMPORTANT
The accepted theory for how water moves through xylem is called the cohesion- tension theory. It relies largely on what is called transpiration pull. Briefly explain the use of the terms cohesion-tension and transpiration pull.
EASY
AS and A Level
IMPORTANT
Give an example of an organic molecule containing nitrogen.
EASY
AS and A Level
IMPORTANT
Give an example of an organic molecule containing phosphorus.
EASY
AS and A Level
IMPORTANT
Give an example of an organic molecule containing sulphur.
EASY
AS and A Level
IMPORTANT
Which substances listed in the below table are the assimilates (made by plants)?
Components of phloem sap
HARD
AS and A Level
IMPORTANT
Which of the following are sources and which are sink?
a. a nectary in a flower
b. a developing fruit
c. the storage tissue of potato tuber (a storage organ) when the buds are beginning to sprout
d. a potato tuber being formed
HARD
AS and A Level
IMPORTANT
Sucrose is highly soluble in water. It is also relatively inactive metabolically. Suggest how these two properties make it suitable as a long distance transport sugar.
HARD
AS and A Level
IMPORTANT
If sucrose is actively loaded into a companion cell, which combination of changes take place in the cytoplasm of companion cells?
