Chapter 5 — Morphology of Flowering Plants

Class 11 Biology Chapter 5 covers the morphology of flowering plants, including roots, stems, leaves, flowers, fruits, and seeds, with their structural variations and adaptations.

Flowering plants display enormous variation in structure and form. This chapter describes the root systems (tap, fibrous, and adventitious), stems with nodes and internodes, leaves with various venation patterns and arrangements, and the reproductive structures including inflorescences, flowers with their four whorls (calyx, corolla, androecium, and gynoecium), and the development of fruits and seeds after fertilization. Understanding these morphological features and their variations is essential for plant classification and identification.

1. 01Root systems vary by plant type: dicots have tap roots (primary + lateral branches), monocots have fibrous roots (many roots from stem base), and some plants have adventitious roots from non-radicle parts
2. 02Stems are distinguished by nodes (where leaves attach) and internodes (portions between nodes); they bear buds and conduct water, minerals, and photosynthates
3. 03Leaves consist of leaf base, petiole, and lamina; venation patterns are reticulate (network) in dicots or parallel in monocots; leaves can be simple or compound (pinnate or palmate)
4. 04Flowers are modified shoots with four whorls: calyx (sepals), corolla (petals), androecium (stamens), and gynoecium (carpels); flower symmetry can be actinomorphic, zygomorphic, or asymmetric
5. 05Fruits develop from ripened ovaries after fertilization and contain seeds; the pericarp may be dry or fleshy (differentiated into epicarp, mesocarp, endocarp)
6. 06Seeds contain a seed coat and embryo with radicle, embryonal axis, and cotyledons; dicot seeds have two cotyledons while monocot seeds have one scutellum