Chapter 5 of Class 11 Biology is Morphology of Flowering Plants. It covers the external structure and modifications of the root, stem, leaf, inflorescence, flower, fruit, and seed. These Class 11 Biology Chapter 5 solutions are also useful as quick revision notes before exams.
The Root System
Usually underground, develops from the radicle. Tap root system (dicots): one main root with lateral branches. Fibrous root system (monocots): cluster of roots from the base of the stem. Modifications: storage roots (carrot), respiratory roots/pneumatophores (mangroves).
The Stem
Develops from the plumule, bears nodes and internodes. Modifications: underground stems (rhizome, tuber, bulb, corm for storage/perennation), stem tendrils (support/climbing), stem thorns (protection).
The Leaf
A lateral, flattened structure from the stem node, bearing a bud in its axil. Parts: leaf base, petiole, lamina. Venation: reticulate (dicots) or parallel (monocots). Modifications: tendrils, spines, phyllode.
The Flower
A modified shoot for sexual reproduction. Parts (whorls, outer to inner): calyx (sepals), corolla (petals), androecium (stamens, male), gynoecium (carpels/pistil, female). Symmetry: actinomorphic (radial) or zygomorphic (bilateral).
The Fruit and Seed
A fruit develops from a fertilized ovary, consisting of pericarp (wall) and seeds. A seed develops from a fertilized ovule, containing an embryo, and either endosperm (albuminous seeds) or none (exalbuminous seeds, food stored in cotyledons).
Class 11 Biology Chapter 5 – Notes and Extra Questions
Along with these NCERT Solutions, students can also use the Class 11 Biology Chapter 5 Extra Questions and Class 11 Biology Chapter 5 Revision Notes for quick revision and extra practice.
