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Transpiration - 2

Description: Tranpiration-II
Number of Questions: 15
Created by:
Tags: Tranpiration-II Transpiration Factors Affecting Transpiration Mechanism of Stomatal Transpiration
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How do plants manage the excessive water absorption by roots?

  1. Using it in respiration

  2. Removing it through transpiration

  3. Removing it through guttation

  4. Reserving it for photosynthesis

Show answer
Correct Option: B
Explanation:

Excessive water absorbed by roots is removed through transpiration.

Which of the following structures allow guttation?

  1. Stomata

  2. Hydathodes

  3. Lenticels

  4. Phloem

Show answer
Correct Option: B
Explanation:

Hydathodes are special pore bearing structures present on the margin of the leaf to allow guttation.

How do forests contribute in bringing rain?

  1. By increasing the moisture in the atmosphere through transpiration.

  2. By cooling the atmosphere through transpiration.

  3. By reducing the CO2 content of atmosphere.

  4. By increasing the O2 content of atmosphere.

Show answer
Correct Option: A
Explanation:

Forests bring rain by increasing the moisture in the temperature.

Which of the following characteristics of xylem aids in ascent of sap?

  1. Thick walled xylem cells

  2. Narrow diameter of xylem vessels

  3. Hypertonic nature of xylem cells

  4. Adhesive force between xylem and water

Show answer
Correct Option: B
Explanation:

Narrow diameter of xylem vessels aids in ascent of sap through capillary force.

What is the advantage of having narrow leaves of plants?

  1. It reduces guttation.

  2. It reduces transpiration.

  3. It increases photosynthesis.

  4. It increases light absorption.

Show answer
Correct Option: B
Explanation:

Narrow leaves have less surface area. So, it reduces loss of water through transpiration. Plants with narrow leaves are usually found in dry climate.

Which of the following factors is responsible for bleeding in plants?

  1. Root pressure

  2. Thick cuticle

  3. Transpiration

  4. Presence of hydathodes

Show answer
Correct Option: A
Explanation:

Root pressure is responsible for bleeding in plants.

Which of the following forces helps in making a continuous column of water in xylem?

  1. Force of adhesion

  2. Force of gravitation

  3. Force of cohesion

  4. Osmotic pressure

Show answer
Correct Option: C
Explanation:

Cohesive force between the water molecules allows the formation of a continuous column of water in xylem and ascent of sap.

Which of the following is not an advantage of transpiration?

  1. Cooling effect

  2. Absorption of CO2

  3. Distribution of mineral salts

  4. Creating suction force

Show answer
Correct Option: B
Explanation:

Transpiration does not play any role in absorption of CO2.

Which of the following statements is NOT true?

  1. Only about 2% of absorbed water is used in photosynthesis.

  2. Potometer measures the water uptake by the cut shoot to determine transpiration.

  3. Cuticular transpiration is regulated by the amount of water in surrounding cells.

  4. Stomatal transpiration does not occur during night.

Show answer
Correct Option: C
Explanation:

Cuticular transpiration is not regulated.

Which of the following statements is NOT true?

  1. Transpiration helps in ascent of sap.

  2. Transpiration is affected by wind velocity.

  3. Rate of transpiration increases with increase in atmospheric pressure.

  4. Thick cuticle reduces transpiration.

Show answer
Correct Option: C
Explanation:

Rate of transpiration increases with decrease in atmospheric pressure.

Which of the following is mainly responsible for the distribution of food manufactured in leaves to lower parts of the plants?

  1. Capillarity

  2. Root pressure

  3. Gravity

  4. Transpiration

Show answer
Correct Option: C
Explanation:

Gravity is mainly responsible for distribution of food manufactured in leaves to lower parts of the plants.

Which of the following instruments is used to measure transpiration?

  1. Potometer

  2. Hydrometer

  3. Voltmeter

  4. Sphygmomanometer

Show answer
Correct Option: A
Explanation:

Ganong's potometer is used for the measurement of transpiration.

Match the following ||| |---|---| | (i) Transpiration | (A) Carbon dioxide | | (ii) Guttation | (B) Ruptured surface of plant | | (iii) Bleeding | (C) Lenticels | | (iv) Stomata | (D) Pores bearing structures on leaf |

  1. (i) - (C), (ii) - (B), (iii) - (D), (iv) - (A)

  2. (i) - (C), (ii) - (D), (iii) - (B), (iv) - (A)

  3. (i) - (B), (ii) - (A), (iii) - (D), (iv) - (C)

  4. (i) - (D), (ii) - (C), (iii) - (B), (iv) - (A)

Show answer
Correct Option: B
Explanation:

Transpiration occurs through lenticels. Guttation occurs through hydathodes. CO2 is absorbed through stomata.

Which of the following conditions will be the most favourable for transpiration to occur?

  1. Hot and humid climate

  2. Hot and dry climate

  3. Cloudy and humid climate

  4. Cloudy and dry climate

Show answer
Correct Option: B
Explanation:

Hot and dry conditions increase the rate of transpiration. Cloudy and humid conditions decrease the rate of transpiration.

Which of the following statements is NOT true for guttation?

  1. It occurs through special pores present in the leaves, called hydrathodes.

  2. It particularly happens in plants growing in warm humid conditions.

  3. It does not have any cooling effect on plant's body.

  4. Water lost does not contain any salt.

Show answer
Correct Option: D
Explanation:

Water lost through guttation contains salt in solution.

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