[1 Mark Question Answer]

Question 11 Mark

Name the paper which is used to show loss of water through stomata of a leaf.

Answer

Cobalt chloride paper.

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Question 21 Mark

Name the instrument used for measuring the rate of transpiration.

Answer

Potometer is the instrument used for measuring the rate of transpiration.

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Question 31 Mark

Write the correct substitutes for only the first two words if it is a wrong statement.

Answer

Cobalt chloride ($CoCl_2$) paper

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Question 41 Mark

Name the opening on the stem through which transpiration occurs.

Answer

Cuticle, lenticels and stomata are the three openings through which transpiration occurs.

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Question 51 Mark

Explain how the rate of transpiration is affected on:
a foggy day

Answer

A foggy day: On a foggy day the area outside the leaf is saturated with water. So, water vapour from the leaves is removed very slowly thereby reducing transpiration.

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Question 61 Mark

Give any three factors that enhance the rate of transpiration.

Answer

The three factors that enhance the rate of transpiration are:
1. High intensity of light 2. High temperature 3. Low humidity

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Question 71 Mark

What is photometer? What is its use?

Answer

Potometer: It is an apparatus where the rate of the air bubble will indicate the rate of transpiration.It is used to measure the rate of transpiration.

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Question 81 Mark

Name the process by which the aerial parts of a green plant give out water as water vapour.

Answer

Transpiration

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Question 91 Mark

Name the organ in which guard cells are located and mention their main functions.

Answer

Stomata. Their main functions include exchange of gases and transpiration.

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Question 101 Mark

Name the tissue which conducts water absorbed by the roots to the upper parts of a herbaceous plant.

Answer

Xylem tissue

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Question 111 Mark

Comment on the following statement:
A well-watered potted plant shows wilting of leaves on a hot sunny day.

Answer

A well-watered potted plant shows wilting of leaves on a hot sunny day. As during hot sunny day rate of transpiration is more than the rate of absorption of water.

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Question 121 Mark

Give three means of water loss in plants.

Answer

The three means of water loss in plants are:
(a) Respiration (b) Guttation (c) Bleeding

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Question 131 Mark

What is the difference between transpiration and evaporation?

Answer

transpiration	evaporation
1. It is the loss of water from the aerial parts of the plant in the form of water vapour.	1. It is a physical process of loss of water in the form of water vapour without incorporation of living cells.

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Question 141 Mark

When does transpiration occur the highest?

Answer

The transpiration occurs highest during the day time as with the increase in light intensity the rate of transpiration increases.

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Question 151 Mark

What is the impact of more atmospheric pressure on transpiration?

Answer

When the atmospheric pressure is higher, less water vapour is lost and the rate of transpiration lowers.

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Question 161 Mark

What is the effect of temperature on transpiration?

Answer

There is a direct effect of temperature on transpiration as the increase in temperature results in increase in the rate of transpiration.

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Question 171 Mark

How does transpiration take place in night?

Answer

Rate of transpiration slows down at night because photosynthesis does not take place and the stomata remains closed.

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Question 181 Mark

From which structure cuticular transpiration occur in plants?

Answer

Cuticular transpiration occurs through the cuticle which is present on the epidermis of leaves & herbaceous stem.

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Question 191 Mark

When does stomatal transpiration take place in plants?

Answer

Stomatal transpiration occurs mainly during the day time when the guard cells of stoma are fully turgid and the stomata are fully open.

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Question 201 Mark

Where does transpiration take place in leaves? Give names of the various parts.

Answer

Transpiration takes place in leaves through stomata. Stomata consist of guard cells, epidermal cells, chloroplast and nucleus.

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Question 211 Mark

In which form, water comes out in transpiration?

Answer

During transpiration, water comes out in the form of water vapour.

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Question 221 Mark

What is transpiration?

Answer

Transpiration: It is the loss of water in the form of water vapour from aerial parts of the plant.

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