Transpiration assertion reason questions for Class 10 ICSE
1.) Assertion (A): Transpiration is the process by which water is lost from the aerial parts of plants.
Reason (R): It occurs mainly through the stomata and lenticels.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
2.) Assertion (A): Transpiration helps in the absorption of minerals by plant roots.
Reason (R): Transpiration creates a negative pressure in the leaf, aiding in the ascent of sap.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
3.) Assertion (A): The rate of transpiration is higher in hot and dry conditions.
Reason (R): High temperature increases the kinetic energy of water molecules, facilitating their movement out of the leaf.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
4.) Assertion (A): Cuticle helps in reducing transpiration.
Reason (R): Cuticle is a waxy layer covering the epidermis, preventing excessive water loss.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
5.) Assertion (A): Wilting of leaves is a result of excessive transpiration.
Reason (R): Insufficient water uptake by the roots leads to the collapse of leaf cells.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
6.) Assertion (A): Transpiration pull is responsible for the movement of water from roots to leaves.
Reason (R): Transpiration creates a suction force that pulls water up the plant.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
7.) Assertion (A): Aquatic plants do not undergo transpiration.
Reason (R): Transpiration is only possible in terrestrial plants.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (b) Both A and R are False
8.) Assertion (A): Transpiration is more rapid in windy conditions.
Reason (R): Wind removes the water vapor from the leaf surface, maintaining a lower concentration gradient.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
9.) Assertion (A): The closing of stomata reduces transpiration.
Reason (R): Stomata are the primary sites for water vapor loss.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (c) A is True and R is False
10.) Assertion (A): Guttation is a form of transpiration.
Reason (R): It involves the exudation of water droplets from the leaf tips or margins.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
- ) Assertion (A): Transpiration helps in cooling the plant.
Reason (R): Water loss during transpiration results in the release of latent heat.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
12.) Assertion (A): Root pressure is involved in the upward movement of water in plants.
Reason (R): Root pressure is caused by the active pumping of water into the xylem.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (c) A is True and R is False
13.) Assertion (A): Transpiration is a purely passive process.
Reason (R): It does not require energy input from the plant.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
- ) Assertion (A): Transpiration is more significant during the daytime than at night.
Reason (R): Stomata are generally open during the day and closed at night.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
- ) Assertion (A): The rate of transpiration is higher in deciduous plants compared to evergreen plants.
Reason (R): Deciduous plants shed their leaves, reducing the surface area for transpiration.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (d) A is False and R is True
16.) Assertion (A): Transpiration contributes to the transportation of nutrients within the plant.
Reason (R): Nutrients dissolved in water are transported upward during transpiration.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
17.) Assertion (A): Transpiration is affected by humidity levels in the atmosphere.
Reason (R): High humidity reduces the rate of transpiration.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (d) A is False and R is True
18.) Assertion (A): Water potential gradient is a driving force for transpiration.
Reason (R): Water moves from an area of higher water potential to an area of lower water potential.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
19.) Assertion (A): Transpiration is essential for the uptake of minerals by plant roots.
Reason (R): Transpiration creates a negative pressure in the root cells, promoting the movement of minerals.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (d) A is False and R is True
- ) Assertion (A): Transpiration rate is higher in herbaceous plants compared to woody plants.
Reason (R): Woody plants have thicker cuticles, reducing water loss.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (c) A is True and R is False
21.) Assertion (A): Transpiration is a vital process for nutrient absorption in hydroponically grown plants.
Reason (R): Hydroponically grown plants lack soil, and transpiration aids in nutrient uptake through the roots.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
22.) Assertion (A): Transpiration is more pronounced in plants with a high surface-to-volume ratio.
Reason (R): Plants with a high surface-to-volume ratio have more exposed surface area for water loss.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
23.) Assertion (A): Transpiration helps in maintaining the turgidity of plant cells.
Reason (R): Water loss through transpiration creates a pulling force that keeps cells rigid.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
- ) Assertion (A): Transpiration is influenced by the availability of soil moisture.
Reason (R): Insufficient soil moisture leads to stomatal closure, reducing transpiration.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
25.) Assertion (A): Transpiration rate is higher in young leaves compared to mature leaves.
Reason (R): Young leaves have more stomata per unit area than mature leaves.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
26.) Assertion (A): Transpiration is a major factor in the water cycle.
Reason (R): It involves the release of water vapor into the atmosphere.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
- ) Assertion (A): Transpiration helps in the distribution of plant hormones.
Reason (R): Hormones are transported in the xylem sap, which is driven by transpiration.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
28.) Assertion (A): Transpiration is affected by light intensity.
Reason (R): Stomata open in response to light, increasing the rate of transpiration.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
- ) Assertion (A): Transpiration helps in the uptake of oxygen by plant roots.
Reason (R): Oxygen is dissolved in water, and transpiration facilitates its movement to the root zone.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
30.) Assertion (A): Transpiration is inversely proportional to humidity.
Reason (R): High humidity creates a favorable environment for water vapor to escape from the leaves.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (d) A is False and R is True
31.) Assertion (A): Transpiration is higher in plants with a greater leaf surface area.
Reason (R): A larger leaf surface area provides more stomata for water vapor escape.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
32.) Assertion (A): Transpiration is a passive process driven by atmospheric conditions.
Reason (R): The movement of water molecules from the leaf to the atmosphere occurs due to differences in water potential.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
33.) Assertion (A): Transpiration is more pronounced in plants growing in well-drained soil.
Reason (R): Well-drained soil ensures an adequate supply of water to the roots, promoting transpiration.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (c) A is True and R is False
34.) Assertion (A): Transpiration is reduced in plants under water stress.
Reason (R): Water-stressed plants close their stomata to conserve water, decreasing transpiration.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (d) A is False and R is True
35.) Assertion (A): Transpiration contributes to the cooling effect in greenhouses.
Reason (R): Water vapor released during transpiration absorbs heat, cooling the greenhouse environment.
(a) Both A and R are True
(b) Both A and R are False
(c) A is True and R is False
(d) A is False and R is True
Answer: (a) Both A and R are True
Also See: Absorption by Roots – The Processes Involved assertion reason questions