MTTC Missed Topics Practice Test 2026 - Free MTTC Practice Questions and Study Guide

Collenchyma provides flexible support for growing parts. These elongated, living cells have unevenly thickened primary walls that reinforce the tissue without making it rigid, especially at the corners. This allows stems, leaf stalks, and other young organs to bend and elongate as the plant grows. Parenchyma is more general-purpose and soft, not specialized for structural support; sclerenchyma offers rigid, usually dead support with thick lignified walls; endodermis is a root layer involved in regulating what passes into the vascular system. So the tissue that gives flexible support in growing parts is collenchyma.