Structure Of A Leaf Flashcards
What is the job of the xylem?
Carries water and mineral ions, only flows upward(transpiration)
What is the job of the Phloem?
Carries sugar around the plant, up and down(translocation)
What is the job of Guard Cells?
Guard cells control the size of the stomata.
What does the stomata do?
The stomata allows gas exchange
What is the waxy cuticle?
The waxy cuticle is waterproof (this helps the water run off the plant)
How are Root Hair Cells adapted?
Root hair cells are adapted for efficient uptake of water by Osmosis and mineral ions by active transport
What does the Xylem tissue do?
The Xylem tissue transports water and mineral ions from the roots to the stems and leaves. It is composed of hollow tubes strengthened by lignin for the transport of water.
What is the role of the Stomata?
The role of the Stomata and guard cells are to control gas exchange and water loss.
What is the first stage of the leaf cycle?
The water moves into the roots by osmosis. Water moves from higher concentrates to lower concentrates.
What is the second stage of the leaf cycle?
Transpiration(loss of water) occurs and water vapour is released by diffusion and evaporation.
What is the third stage of the leaf cycle ?
Water continues to move up through the stem. Leaves replace the water lost by evaporation.
What is the fourth stage of the leaf cycle?
Water is lost from the leaves by evaporation and diffusion.
What are the four factors affecting Transpiration?
Light Intensity
Temperature
Air Movement
Humidity
What is the effects of humidity?
The greater the humidity-the lower the rate of transpiration. Due to the water in the air and the water in the plant.
What is the effect of Temperature during Transpiration?
The higher the temperature - the greater the rate of transpiration. Diffusion happens faster due to more kinetic energy
