AP BIOLOGY

Detailed explanation-1: -In botany, a cortex is an outer layer of a stem or root in a vascular plant, lying below the epidermis but outside of the vascular bundles. The cortex is composed mostly of large thin-walled parenchyma cells of the ground tissue system and shows little to no structural differentiation.

Detailed explanation-2: -Hypodermis is the outermost cell layer of the cortex of plants. It is also known as exodermis.

Detailed explanation-3: -layer of cells, called the endodermis, which regulates the flow of materials between the cortex and the vascular tissues.

Detailed explanation-4: -The endodermis is the innermost part of the cortex. The cells of the endodermis have primary cell walls which are thickened on all four sides.So “A” is the correct answer.

Detailed explanation-5: -The unifying characteristic of all parenchyma cells is that they are living at maturity and capable of cell division, giving them important roles in regeneration and wound healing. Other key functions of these cells include photosynthesis, storage, secretion and transport.