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प्रश्न
Why are the stomata in most plants more numerous on the lower surface of a leaf instead of being on the upper surface?
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उत्तर
The lower surface of leaf is sheltered from direct sunlight. If more stomata are on the upper surface of a leaf, then excessive transpiration would occur, resulting in quick wilting of the plant. Hence most plants have more numerous stomata on the lower surface of a leaf to control the rate of transpiration.
संबंधित प्रश्न
(a) State whether the following statement are True or False.
(b) Rewrite the false statement in (a) above in the correct form by changing either the first or the last word only.
Transpiration creates a pull for the upward movement of the sap.
Which of the following statements are true and which ones are false? Give reason in support of your answer.
Most transpiration occurs during midday.
Choose the correct answer:
Transpiration is more ____________
Choose the correct answer:
In herbaceous plants, following percentage of absorbed water comes out __________
Give Reasons for the following:
Young plants wilt on a hot sunny day.
Explain the Term
Transpiration
Study the diagram given alongside and answer the questions that follow:
(i) Explain the physiological process of being study.
(ii) What will be the observations in the two test-tubes after about 2-3 days?
(iii) Give a reason for your answer in (ii) above.
(iv) Why is the surface of water covered with oil?
(v) State the purpose of setting up test tube B.
Complete the following sentence with appropriate word:
Plants become cool as a result of __________.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
More transpiration occurs from the upper surface of a leaf.
Write the functional activity of the following structure:
Lenticels
