Give reasons for the following:
(i) The rate of transpiration increases in hot and dry
weather.
(ii) Water transpired is water absorbed.
(iii) In some xerophytes leaves are modified into
spines.
(iv) Antitranspirants can be used to keep cut flowers
fresh for a long time.
(v) Balsam plants wilt during midday even if the soil
is well watered.
(vi) The leaves of certain plants roll up on a bright
sunny day.
Answers
Answer:
1) The rate of transpiration increases during hot and dry season because the evaporation is more at the tip of the plant and plant looses more water.
2) All plants continuously absorb water through their roots. This water is conducted upwards through the stem and is distributed to all the aerial parts including the leaves. ... The rest of it is almost lost to the atmosphere as water vapour as a result of transpiration. Therefore, water transpired is water absorbed.
3) Xerophytes are plants growing in dry climate. It is important for them to conserve water. Leaves modified into spines reduce the surface area and thus reduce the rate of transpiration.
4) Antitranspirants are used to reduce the process of transpiration. These are generally applied to cut flowers and transplanted shrubs etc thus preventing them from early drying out by bloacking the hydrogen ion transport from the stomatal cells. These chemicals also protect from diseases (fungal) and burns.
5) Balsam plants wilt during midday even if the soil is well watered as the rate of transpiration is greater than the rate of absorption, by wilting they try to reduce the surface area and thereby the rate of transpiration.
6) On a bright Synny day, leaves roll up to decrease the area of the leaf. This reduces the transpiration in leaves helping them to conserve more water.
Explanation:
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