Which structural-functional issue in a plant root would hinder gas exchange but not significantly impact water absorption?

Correct option is B

The correct answer is (b) Disrupted stomatal apparatus on aerial organs.

• The stomatal apparatus on aerial organs (leaves and stems) is responsible for gas exchange (O₂ and CO₂).

• Disruption of the stomatal apparatus affects gas exchange but does not impact water absorption, as water is absorbed through the roots, not the aerial organs.

Information Booster:

• (A) Endodermal cells without suberin:

  • Suberin in the Casparian strip regulates water and nutrient flow in roots, not involved in gas exchange.

• (C) Absence of root hairs due to epidermal deformation:

  • Root hairs aid water and nutrient absorption. Their absence affects water uptake but does not impact gas exchange, which occurs in aerial parts.

• (D) Mutated epiblema cells lacking vacuoles:

  • Epiblema cells are involved in water absorption. Lack of vacuoles affects water uptake but does not interfere with gas exchange.

Additional Facts:

• Stomatal Function: Stomata regulate the exchange of gases (CO₂ and O₂) and transpiration in plants.

• Gas Exchange: Primarily occurs in leaves and stems via stomata, not through roots.

• Root Water Absorption: Roots (via root hairs) absorb water and nutrients, not involved in gas exchange.