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प्रश्न
Name the factors which affect the rate of transpiration? State their role in each case.
उत्तर
The following are the main factors that affect the rate of transpiration:
- Sunlight: During daytime, the rate of transpiration is faster. This is because the stomata remain open to allow the inward diffusion ofcarbondioxide for photosynthesis.
During dark, the stomata are closed, and hence transpiration hardly occurs at night. - Temperature: Transpiration is faster on hot summer days as compared to cold winter.
- Wind: Transpiration is more when the wind is blowing faster as water evaporates faster from the leaves.
- Humidity: Transpiration is reduced if the air is humid. Air cannot hold any water molecules when it is already laden with moisture (humidity).
- Low atmospheric pressure: The rate of transpiration increases when the pressure is low.
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संबंधित प्रश्न
State whether the following statement is true or false. Rewrite the false statement correctly.
During transpiration, the leaves lose more water from their upper surface.
Given below is an example of a certain structure and its special functional activity:
Chloroplasts and Photosynthesis.
In a similar way, write the functional activity against each of the following:
Thick cuticle and ………………………..
Why are the stomata in most plants more numerous on the lower surface of a leaf instead of being on the upper surface?
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?
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions.
What is the purpose of keeping the test tube B in the experimental setup?
Give Reasons for the following:
Balsam plants wilt during midday even if the soil is well watered.
Explain the Term
Cuticular transpiration
Give Technical Term
Loss of water from the aerial parts of a plant.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Root hairs are the extensions of the outer epidermal cells of the root
State the Location:
Lenticels
