Absorption by Roots – The Processes Involved assertion reason questions for Class 10 ICSE
Question 1:
Assertion (A): Root hairs increase the surface area of the root for better absorption.
Reason (R): Water and minerals are absorbed by the root hairs through osmosis and active transport.
(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
Question 2:
Assertion (A): The root cap protects the delicate meristematic cells as the root pushes through the soil.
Reason (R): Apical meristem at the root tip is responsible for primary growth and root elongation.
(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
Question 3:
Assertion (A): Endodermis cells are impermeable due to the presence of the Casparian strip.
Reason (R): The Casparian strip allows selective entry of water and minerals into the vascular cylinder.
(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
Question 4: Assertion (A): Mycorrhizal associations enhance the absorption of nutrients, especially phosphorus, by the root system.
Reason (R): Mycorrhizae are symbiotic associations between roots and fungi that increase the absorptive surface area of 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
Question 5:
Assertion (A): Root pressure is responsible for the guttation process in plants.
Reason (R): Guttation occurs when excess water from the roots is forced out through hydathodes on 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
Question 6: Assertion (A): Root systems anchor the plant in the soil and prevent soil erosion.
Reason (R): Root systems play no role in water and nutrient absorption for 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:- (d) A is False and R is True.
Question 7:
Assertion (A): Root hairs are unicellular extensions of the epidermis.
Reason (R): Root hairs secrete enzymes that break down organic matter for absorption by the root.
(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
Question 8:
Assertion (A): Xylem in the root transports water and minerals upward from the roots to the rest of the plant.
Reason (R): Phloem in the root transports sugars produced in the leaves to the rest of 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:- (c) A is True and R is False
Question 9:
Assertion (A): Root pressure and capillary action aid in water movement from the soil to the xylem in the roots.
Reason (R): The presence of root hairs enhances the process of transpiration in 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:- (a) Both A and R are True
Question 10:
Assertion (A): The root system is essential for the uptake of essential nutrients like nitrogen, phosphorus, and potassium.
Reason (R): Nutrients are absorbed from the soil solution and transported throughout the plant via the root system.
(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
Question 11:
Assertion (A): The root epidermis is responsible for the absorption of water and minerals.
Reason (R): Root hairs increase the absorptive surface area of the root.
(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
Question 12:
Assertion (A): The root pressure contributes to the movement of water from the soil to the xylem.
Reason (R): Osmosis and active transport processes aid in the absorption of water and minerals by the root.
(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.
Question 13:
Assertion (A): Endodermis and Casparian strip facilitate the regulation of substances entering the xylem.
Reason (R): Phloem transports water and minerals absorbed by the root to different parts of 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:- (c) A is True and R is False
Question 14:
Assertion (A): Mycorrhizal associations aid in the absorption of phosphorus by the root system.
Reason (R): Mycorrhizae increase the surface area for absorption by establishing a symbiotic relationship with fungi.
(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
Question 15:
Assertion (A): Root hairs facilitate the absorption of water and minerals through diffusion and active transport.
Reason (R): The root cap protects the root tip as it pushes through the soil.
(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
Question 16:
Assertion (A): Guttation occurs due to root pressure pushing water through hydathodes on leaves.
Reason (R): Transpiration and guttation are two independent processes in 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:- (d) A is False and R is True.
Question 17:
Assertion (A): The root system plays a significant role in anchoring the plant in the soil to prevent soil erosion.
Reason (R): Root systems have no role in the absorption of nutrients in 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:- (a) Both A and R are True
Question 18:
Assertion (A): Root hairs are unicellular extensions of root epidermal cells.
Reason (R): Root hairs help in breaking down organic matter for absorption by the root.
(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
Question 19:
Assertion (A): The xylem in roots primarily transports water and minerals from the root to the rest of the plant.
Reason (R): The phloem in roots carries sugars produced in the leaves to the rest of 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
Question 20: Assertion (A): Root pressure, capillary action, and root hairs collectively contribute to the movement of water from the soil to the xylem.
Reason (R): Root systems have no role in transpiration in 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:- (d) A is False and R is True.
Question 21:
Assertion (A): Root hair cells have large surface areas due to their elongated shape.
Reason (R): The primary function of root hairs is to facilitate the absorption of water and 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:- (a) Both A and R are True
Question 22:
Assertion (A): Root pressure is responsible for the upward movement of water in the xylem.
Reason (R): Root pressure aids in transpiration, leading to water absorption from the soil.
(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
Question 23:
Assertion (A): Endodermis cells are selectively permeable due to the presence of the Casparian strip.
Reason (R): The Casparian strip allows uncontrolled entry of substances into the vascular tissue.
(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
Question 24:
Assertion (A): Mycorrhizal associations increase the absorption of water and essential nutrients by roots.
Reason (R): Mycorrhizae are harmful to the root system, affecting their absorption capacity.
(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
Question 25:
Assertion (A): The root cap is responsible for protecting the root tip from abrasions and providing signals for root growth.
Reason (R): The apical meristem is inactive and non-essential for primary growth in 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
Question 26:
Assertion (A): Guttation is caused by the root pressure forcing excess water out through hydathodes on leaves.
Reason (R): Guttation and transpiration are the same processes in 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:- (d) A is False and R is True.
Question 27:
Assertion (A): Root systems primarily aid in anchoring the plant and have no role in nutrient absorption.
Reason (R): The root system is the site for gaseous exchange in 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:- (d) A is False and R is True
Question 28:
Assertion (A): Root hairs are specialized cells for breaking down organic matter for absorption by the root.
Reason (R): Root hairs increase the surface area for absorption, aiding in water and mineral uptake.
(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
Question 29:
Assertion (A): The xylem in roots transports water and minerals upward from the roots to the rest of the plant.
Reason (R): Phloem in roots carries sugars produced in the leaves to the rest of 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
Question 30: Assertion (A): Root pressure, capillary action, and root hairs contribute to the movement of water from the soil to the xylem.
Reason (R): Root systems have no role in transpiration in 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:- (a) Both A and R are True
Question 31:
Assertion (A): The elongation zone of the root is essential for root growth and pushing the root cap through the soil. Reason (R): Root hair cells lack a large surface area for efficient absorption of water and 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:- (a) Both A and R are True
Question 32:
Assertion (A): The endodermis with its Casparian strip acts as a checkpoint for substances entering the vascular system of the root.
Reason (R): The Casparian strip allows unrestricted movement of minerals and water into the vascular tissue.
(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
Question 33:
Assertion (A): Mycorrhizal associations aid in the absorption of water and essential nutrients by roots.
Reason (R): Mycorrhizae interfere with root function and reduce the absorptive capacity of the root system.
(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
Question 34:
Assertion (A): The root cap is crucial for protecting the delicate root meristem and secretes substances to signal root growth.
Reason (R): The root cap is inactive and has no role in root growth or protection.
(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
Question 35:
Assertion (A): Guttation is caused by the root pressure forcing excess water out through hydathodes on leaves.
Reason (R): Guttation and transpiration are the same processes in 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:- (a) Both A and R are True
Also See: Genetics – Some Basic Fundamentals Ch. 3 assertion reason questions