Flashcards
Biology 3.1.3 Transpiration
Cards in this deck (14)
- 1Define transpirationThe loss of water vapour from the upper part of the plant, especially the leaves
(must say "water vapour" not just "water") - 2What part of the leaf limits evaporation?Waxy cuticle
- 3What are the three processes of transpiration (in order)?1) Osmosis
2) Evaporation
3) Diffusion - 4Explain how osmosis is involved in transpiration?The water enters the mesophyll cells via osmosis via the symplast and apoplast pathway
- 5Explain how evaporation is involved in transpiration?The water evaporates from the surface of the mesophyll cells into air spaces between mesophyll cells, increasing the water potential
- 6Explain how diffusion is involved in transpiration?When the water potential is higher inside the leaf than outside, water diffuses out of the leaf via the stomata
- 7Why does water leave the leaf via diffusion rather than osmosis?There is no membrane so can't be osmosis as the water leaves via the stomata, not aross a membrane
- 8Why do stomata open?When the water enters the guard cells via osmosis, the guard cells become turgid, opening the stomata
- 9How d guard cells decrease the water potential?They actively pump in K+ ions
- 10What apparatus is used to measure the rate of transpiration of a plant?Potometer
- 11How do you use a potometer?Fill up the potometer with water and take a fresh shoot and cut it underwater at a slant. Keeping everything underwater, put the shoot into the potometer. Put vaseline on all the joints of the potometer and then dry off the leaves and leave them for a bit. Adjust the capillary tube so that the water is at the start of the scale and measure how far the water moves in a set period of time
- 12Why must we ensure that we dry the leaves?So that transpiration can occur
- 13Why must we cut he shoot underwater and ensure no air bubbles are in the system?So that the xylem can maintain a continuous column of water
- 14Why must we leave the leaves for a bit before conducting the experiment?So that the stomata can start to open and close
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- User has deleted their subject information Flashcards on Biology 3.1.3 Transpiration, created by Deleted user on 22/04/2019.
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- Created by Sam Gunnell · Apr 16, 2019
- Copied by Sam Gunnell · Apr 22, 2019
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