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Question
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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Solution
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.
RELATED QUESTIONS
Name the factors which affect the rate of transpiration? State their role in each case.
Describe an experiment to show that the plant loses water through its leaves.
Transpiration helps in creating ______ force and in eliminating excess ______.
Given below is an apparatus which has setup to investigate a physiological process in plants. The setup was placed in bright sunlight. Answer the questions that follow:
Draw a neat, labelled diagram of a stomatal apparatus.
The diagram alongside represents a structure found in a leaf. Study the same and answer the questions that follow:
(i) Name the parts labeled A and B.
(ii) What is the biological term for the above structure?
(iii) What is the function of the part labeled A?
(iv) Mention two structural features of A, which help in the function mentioned in (iii) above?
(v) Where is this structure likely to be found in a leaf?
(vi) The structure (fig.5.22) helps in the process of transpiration. Explain the term transpiration.
(vii) How many other cells are found surrounding this structure as seen in the diagram?
Give Reasons for the following:
Transplanting of seedlings to a flowerbed in the evening is better than doing so in the morning.
What is meant by the term transpiration stream?
Explain the Term
Transpiration
Write the functional activity of the following structure:
Cuticle
