IGCSE B7.1 transport in plants (Transpiration)

What is defined as the loss of water vapour from plant leaves by evaporation of water at the surfaces of the mesophyll cells followed by diffusion of water through the stomata?

• Translocation

• Transpiration

• Gas exchange

• Cohesion

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

During transpiration, water evaporates from the surface of which cells in the leaf?

What is the name of the pores in the lower epidermis that allow water vapour to leave the leaf?

Which cells control the size of the opening of the stomata to regulate water loss?

Tags

NGSS.MS-LS1-2

Water first enters a plant by being absorbed by which type of cell?

Through which cells does the water have to travel to move from the root hair cell to the xylem in the centre of the root?

What property of water allows it to be pulled along the xylem when water evaporates from the leaves?

• Adhesion

• Cohesion

• High boiling point

• Good solvent

How does water vapour in the air space leave the leaf?

• Osmosis

• Diffusion

• Transpiration

• Translocation

Answer explanation

It is diffusion, rather than osmosis as there is no cell membrane to cross. It can't be transpiration as the water is already vapour in the air space (transpiration = evaporation + diffusion).

How would you expect increasing the temperature to affect the rate of transpiration?

• Increase it

• Decrease it

• No change

• Can't predict

Tags

NGSS.HS-LS1-3

How would you expect increasing the humidity to affect the rate of transpiration?

• Increase it

• Decrease it

• No change

• Can't predict

Tags

NGSS.MS-LS2-3