1979 A.P.

PLANT SYSTEMS QUESTION 1979:L. PETERSON/AP BIOLOGY

In relation to plants, describe in detail ace way of:

a) measuring the rate of transpiration

b) measuring the rate of photosynthesis

c) separating pigments

Essay :

Transpiration is the wrong of peeing vapor from land plants into the atmosphere, causing movement of urine through the plant from the soil to the atmosphere via roots, shoot and leaves, which occurs mainly through the stomata. Factors which tooshie affect the rate of transpiration are those such(prenominal) as temperature, humidity, wind, and light, and the water in the soil. A plant cannot cut through to transpire rapidly if its water loss is not make up by replacement from the soil. When absorption of water by the roots fails to keep up with the rate of transpiration, loss of turgor occurs, and the stomata close. This forthwith reduces the rate of transpiration (as well as of photosynthesis). If the loss of turgor extends to the rest of the cockle and stem, the plant wilts. To measure transpiration, you can artifici aloney create the surround for a plant for which you want to transpire. For example, if you have a .1 mL pipette, plastic tubing and a leaf, you have almost all the materials you need to measure the rate of transpiration for that leaf and whatever environmental conditions you impose upon the leaf.



One will be examining the amount of water in the tubing which is being customd, and from there you can demonstrate how much water has been used.

Photosynthesis is the process by which green plants, algae and some bacteria absorb light energy and use it to synthesize organic compounds. In green plants, photosynthesis occurs in chloroplasts, that acquire the photosynthetic pigments. Photosynthesis occurs by slightly different processes in C3 and C4 plants. Factors which can affect...

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