The correct option is Only two
Explanation
Simple permanent tissues in plants are classified into Parenchyma, Collenchyma, and Sclerenchyma based on their cell wall structure and function. Modifications of these tissues serve specific physiological roles.
- Pair 1 is correctly matched: Aerenchyma is a specialized modification of parenchyma tissue found primarily in aquatic plants (hydrophytes). It possesses large air cavities or intercellular spaces that store gases and provide buoyancy, enabling the plants to float.
- Pair 2 is correctly matched: Chlorenchyma refers to parenchyma cells that contain chloroplasts. These cells are responsible for performing photosynthesis and are abundantly found in the mesophyll of leaves and the green parts of stems.
- Pair 3 is incorrectly matched: The characteristic of "cells with corners thickened by cellulose, hemicellulose, and pectin" belongs to Collenchyma, which provides mechanical support to young stems and petioles while remaining living. Sclerenchyma, in contrast, consists of long, narrow cells with thick and lignified cell walls. Sclerenchyma cells are usually dead at maturity and provide hardness and structural strength (e.g., coconut husk).
Key Takeaway: The primary distinction in mechanical tissues lies in their cell walls: Collenchyma has uneven thickening (cellulose/pectin) and is living, whereas Sclerenchyma has uniform thickening (lignin) and is dead.