Which tissue layer of the leaf carries out most of the light absorption for photosynthesis?
Palisade tissue
Spongy mesophyll tissue
Lower epidermal tissue
What causes the stomata to open?
The guard cells die
The guard cells become flaccid
The guard cells become turgid
What is the name of the process by which carbon dioxide and oxygen enter and leave the leaf?
Active transport
Osmosis
Diffusion
Which of these substances is carried in the phloem vessels of the plant?
Water
Sucrose
Mineral salts
Which of these is a feature of xylem vessels?
Living cytoplasm
Many mitochondria
Tough walls containing lignin
What is the loss of water vapour through the stomata called?
Translocation
Transpiration
Which of these is a function of transpiration?
To carry sugar to the roots for storage as starch
To carry sucrose to the growing shoots
To cool the leaves by evaporation
What is the name of the process in which water moves into the root hair cell?
How are root hair cells adapted to maximise water absorption?
They have a large surface area
They have a small surface area
They have a fully permeable membrane
What two things are measured in a potometer to give an estimate of the rate of transpiration?
The volume of water lost and the time it took
The distance the bubble travelled and the time it took
The distance the bubble travelled and the volume of water lost