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Bio Revision

What does xylem do? Xylem carries water, phosphates, potassium, and nitrates (protein) from the roots to the rest of the plant through the inner place of the stem
What does phloem do? Phloem carries sucrose (sugar) and amino acids (to make protein) from the leaves to the rest of the plant through the outer place of the stem.
Describe the pathway taken by water through a plant from soil to leaves It is absorbed in the root hair cells and carried to the root cortex cells, then to the xylem vessels in the stem and finally ends at the mesophyll cells in the leaves.
Describe transpiration It is the evaporation of water at the surface of the mesophyll cells followed by the loss of water vapour from plant leaves through the stomata.
3 factors that affect transpiration humidity, light temperature
describe translocation movement of nutrients such as glucose and amino acids from the leaves to other parts of the plants through the phloem
What is amino acids made of glucose made from photosynthesis and nitrates made from soil
what does amino acids make protein
Whats stoma holes that plants let the C02 in and oxygen and water vapour out
How does stomata closes and opens the guard cell opens in the daylight and closes in night
State the pathway taken by water through root, stem and leaf root hair cells to root cortex cells to xylem vessels to mesophyll
What causes water to be pulled up the stem of plants The differences of the concentration of solute drives the forces up a plant. The cohesion of water molecules makes them go up.
Why does the xylem vessels have a thick wall It has a thick wall to stiffen itself.
What is cohesion? It's the movement of water molecules bonding together because of the different charges between them.
Besides transpiration, what does the plant create to force water vapour going up? Root pressure created by the root
Why do plants need nitrogen to make protein
Why do plants need magnesium to make chloroplasts
What are done with glucose 1. stored as starch 2. used for respiration 3. changed to sucrose to travel to roots
What enters the leaf through stomata during photosynthsis CO2
State the direction of sucrose leaves to other parts through phloem
State the direction of nitrates roots to other parts through xylem
State the differences between xylem and phloem 1. Xylem carries water, nitrates, and mineral ions; phloem carries amino acids and sucrose 2. Xylem has only one way (roots to leaves); phloem have two ways 3. xylem has no end wall between cells; phloem has walls between cells
Created by: amos228



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