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Biology [2 Mark Question Answer]

Transpiration · ICSE STD 10 (ICSE - English Medium). 16 questions.

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[2 Mark Question Answer]

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16 questions · timed · auto-graded

Question 12 Marks
Mention three adaptations found in plants to reduce transpiration.
Answer
The three adaptations found in plants to reduce transpiration are:
1. Sunken stomata
2. Modification of leaves into spines
3. Presence of thick cuticle
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Question 22 Marks
A well watered healthy potted plant with variegated leaves was kept in darkness for about 24 hours. It was then set up as shown in the diagram and exposed to light for about 12 hours. At the end of this time, leaf x and y were tested for starch. Study the diagram and answer the questions that follow:
(i) Why was the plant initially kept in darkness for 24 hours?
(ii) What is the function of sodium hydroxide solution in the flask?
(iii) Select the correct leaf from the five available choices shown in the diagram as a, b, c, d and e. Rewrite the correct answer by filling in the appropriate letter for the questions that follow:
1. After the starch test, leaf x would look like ______.
2. After the starch test, leaf y would look like ______.
(iv) The experiment with leaf y shows that photosynthesis requires the presence of certain factors. Mention any one factor.
Answer
(i) The plant was kept in the dark to destarch the leaves.
(ii) Sodium hydroxide absorbs $CO _2$ thereby making the flask $CO _2$​​​​​​​ free.
(iii) (1) C, (2) E
(iv) Sunlight
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Question 32 Marks
What is the impact of transpiration on absorption? Explain.
Answer
Transpiration increases the rate of water absorption because it causes the concentration of sap to rise. In this condition cells absorb water from their neighbours, leaf, stem and root which creates transpirational pull which finally helps in the absorption of water.
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Question 42 Marks
Explain how the rate of transpiration is affected on:
a windy day
Answer
A windy day: On a windy day the water vapour released from the leaves by transpiration is removed faster and the leaf does not get saturated with water. So, transpiration is more during a windy day.
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Question 52 Marks
Explain the importance of transpiration.
Answer
Following are the importance of transpiration :
1. It causes transpirational pull which helps in the absorption of water.
2. It produces a cooling effect.
3. It helps in the ascent of sap.
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Question 62 Marks
What do you mean by transpiration? Explain its importance in plants.
Answer
Transpiration: It is the loss of water in the form of water vapour usually during day time.
Following are its importance in plants:
1. It causes transpirational pull which helps in the absorption of water.
2. It produces a cooling effect.
3. It helps in the ascent of sap.
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Question 72 Marks
Why is transpiration important for plants?
Answer
Transpiration is important for plants because it evaporates excess water which produces a cooling effect to plants. This process also helps in ascent of sap and transportation of water and minerals to the various parts of the plants.
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Question 82 Marks
Distinguish between the following :
Cuticular transpiration and lenticular transpiration
Answer
Cuticular transpirationlenticular transpiration
1. It is the loss of water through the cuticle present on the epidermis of leaves and herbaceous stem .1. It is the loss of water through the lenticels present in the bark of the stem .
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Question 92 Marks
Distinguish between the following :
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 102 Marks
Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in front of a fan?
Answer
Movement of the air bubble will be faster.
Reason : Moving air produces dry air which increases the rate of transpiration which hence increases the movement of air bubble.
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Question 112 Marks
Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in sunlight.
Answer
Movement of the air bubble will be faster.
Reason: During sunlight, stomata remains opened due to which the rate of transpiration increases which hence increases the movement of air bubble.
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Question 122 Marks
Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in dark.
Answer
Movement of the air bubble will be decreased or slow.
Reason: During dark, stomata remains closed due to which the rate of transpiration decreases which hence decreases the movement of air bubble.
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Question 132 Marks
What is the difference between transpiration and guttation?
Answer
The difference between traspiration and guttation are as follows :
transpiration guttation
1. It is the loss of water in the form of water vapour usually during day time .1. It is the loss of water in the form of a liquid during night time .
2. It occurs through stomata , cuticle and lenticels.2. It occurs through hydathodes.
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Question 142 Marks
How many types of transpiration are found in plants?
Answer
There are three types of transpiration found in plants:
(a) Cuticular transpiration (b) Lenticular transpiration (c) Stomatal transpiration
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Question 152 Marks
What is the relationship between transpiration water and water absorbed from the soil?
Answer
The relationship between transpiration water and water absorbed from the soil is that if the soil is deficient in water then the rate of water absorption decreases which hence decreases the rate of transpiration and if the soil has excessive water then the rate of water absorption increases which in turn increases the rate of transpiration.
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Question 162 Marks
Give one important difference between transpiration and evaporation.
Answer
The important difference between transpiration and evaporation is that transpiration is the loss of water from the aerial parts of the plant while evaporation is loss of water from any surface.
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[2 Mark Question Answer] - Biology STD 10 Questions - Vidyadip