AP BIOLOGY

Detailed explanation-1: -If the water lost through transpiration is more than than the water absorbed by the root hair cells the plant tends to loose water. As a result the leaves stems and flowers become droop.

Detailed explanation-2: -When plant roots can no longer absorb enough water to satisfy transpiration from its leaves, it begins to dehydrate. At this point the stomates can over-ride photosynthesis and close down for certain parts of the day to avoid further water loss.

Detailed explanation-3: -When transpiration exceeds water absorption by the roots, the plant dehydrates. This usually happens each day with the plant rehydrating again each night. As the soil dries out this rehydration is not complete, resulting in the plant becoming water stressed (Figure 3).

Detailed explanation-4: -Plants absorb water from the soil by osmosis. Root hair cells are adapted for this by having a large surface area to speed up osmosis. The absorbed water is transported through the roots to the rest of the plant where it is used for different purposes: It is a reactant used in photosynthesis.

Detailed explanation-5: -Transpiration is defined as the physiological loss of water in the form of water vapor. It also evaporates from the surfaces of leaves, flowers, and stems. Transpiration has two main functions namely, cooling the plant and pumping water and minerals to the leaves for photosynthesis.