Biology- Transport In Plants Flashcards
What does the epidermis do
Covers the outer surfaces of the plant for protection
What is the palisade mesophll
The main site of photosynthesis in the leaf
What is the spongy mesophll
Air spaces between the cells allowing gases to diffuse through the leaf
What do xylem vessels do
They transport water up through the leaf and supports the plant
What does the phloem vessel do
Transports dissolved minerals and food through the plant
What is the meristem tissue and where is it found
It is found mainly at the tips of the roots where it produces new cells for plant growth
How does water enter the plant
It enters the plant through the soil and root hair cells, by osmosis
What cells are specialised to transports necessary nutrients round the plant
Root hair, xylem and phloem cells
What are the stages of water transport
1- water enters the plant through the soil
2- water is transported through the xylem
3- once at the leaves the water will evaporate through the stomata
What is transpiration
The loss of water through the leaves
What can affect transpiration
-increase in temperature causes an increase the rate as there is more energy transferred
- faster air flow will increase the rate as it will move away water vapour allowing more to evaporate
- increased light intensity causes an increase as it will cause the stomata to open
- an increase in humidity DECREASES the rate as the air contains more water vapour
What is the role of guard cells
To open and close the stomata
Daytime- open
Nightime- closed
Why are stomata closed at night time
Because the carbon dioxide is not needed for photosynthesis so closing the stomata prevents water loss
How can you measure the rate of transpiration
Using a potometer
What is translocation
The movement of food through the phloem tissue
