Yr 12: Topic 1-1 Osmosis & Transpiration

Question 1

What is osmosis

Answer 1

It is a special type of diffusion that only involves the movement of water molecules

Question 2

What is a plant cell called when it is full of water, and when it has little water in it?

Answer 2

Full of water- turgid

Little water-plasmolysed

Question 3

What is transpiration?

Answer 3

It is the evaporation of water at the surfaces of the spongy mesophyll cells in leaves followed by loss of water vapour through the stomata by diffusion

Question 4

What is the transpiration stream

Answer 4

It is the continuous movement of water through the plant, from the root to the stem and finally to the leaves

Question 5

Go into further detail on the transpiration stream

Answer 5

As the roots absorb water, water also leaves the plant through transpiration at the leaves maintaining a constant concentration gradient.

Question 6

How does transpiration occur, involve the xylem

Answer 6

The xylem carries water from the root into the leaf, where through diffusion it moves into the spongy mesophyll and leaves the leaf through the stomata by transpiration