Morphology of Flowering Plants notes

Morphology is the study of the external form and structure of plants. In flowering plants, the vegetative parts are root, stem and leaf, while the reproductive parts include inflorescence, flower, fruit and seed. NCERT emphasizes that these organs show many modifications according to function, habitat and reproduction. For NEET, this chapter is highly memory-based but conceptually connected: root, stem and leaf identification helps in modification questions; flower structure explains aestivation, placentation and floral formulae; fruit and seed structure helps in monocot-dicot comparison; and plant families such as Fabaceae, Solanaceae and Liliaceae are frequently asked through diagnostic features, floral formulae and economic importance.

Root, stem and leaf form the vegetative body of flowering plants. Roots usually arise from the radicle, grow towards gravity, absorb water and minerals, and may store food, support the plant or help in respiration. Stems arise from the plumule, bear nodes, internodes, buds, leaves, flowers and fruits, and may become underground, subaerial or aerial modifications. Leaves are lateral, flattened organs mainly for photosynthesis and transpiration; they show venation, phyllotaxy and modifications such as tendrils, spines and phyllodes. For NEET, the key skill is identifying whether a modified structure is root, stem or leaf using origin, position, nodes, internodes, buds and NCERT examples.

Inflorescence is the arrangement of flowers on the floral axis. It helps plants display flowers efficiently for pollination and seed formation. In racemose inflorescence, the main axis continues to grow and flowers are produced laterally in acropetal succession, meaning younger flowers are near the apex and older ones near the base. In cymose inflorescence, the main axis ends in a flower, growth is limited and flowers show basipetal succession, meaning older flowers are near the apex. Special inflorescences such as cyathium, verticillaster and hypanthodium are compact and highly modified. NEET questions often test axis growth, order of flower opening and identification from diagrams or examples.

A flower is a modified shoot specialized for sexual reproduction in angiosperms. It usually has four whorls arranged on the thalamus: calyx, corolla, androecium and gynoecium. Calyx protects the bud, corolla attracts pollinators, androecium produces pollen and gynoecium contains ovules. Flowers are described by symmetry, sexuality, bract condition, ovary position, aestivation, placentation and floral diagram. Aestivation describes the arrangement of sepals or petals in a flower bud, while placentation describes the arrangement of ovules inside the ovary. NEET frequently asks terms such as actinomorphic, zygomorphic, hypogynous, perigynous, epigynous, valvate, twisted, imbricate, vexillary and marginal, axile, parietal, basal and free-central placentation.

Fruit is the mature ovary formed after fertilisation, while seed is the mature ovule. A fruit generally has a fruit wall called pericarp and seeds inside it. Fruits may be true or false depending on whether only ovary or additional floral parts contribute, and may be simple, aggregate or composite based on origin. Seeds contain seed coat, embryo and stored food either in cotyledons or endosperm. Dicot seeds like gram have two cotyledons, while monocot seeds like maize have one cotyledon called scutellum. Seed dispersal by wind, water, animals or explosive mechanisms helps reduce competition and spread species. NEET focuses on fruit origin, pericarp layers, monocot-dicot seed diagrams and NCERT examples.

Floral formula is a compact symbolic representation of a flower’s structure. It records bract condition, symmetry, sexuality, number and fusion of floral parts, adhesion, cohesion and ovary position. Floral diagram is a top-view diagram showing the relative arrangement of sepals, petals, stamens, carpels, mother axis and bract. Semi-technical description writes the same information in a standard order using correct botanical terms. For NEET, students must decode symbols such as Br, Ebr, ⊕, %, ⚥, ♂, ♀, K, C, P, A, G, brackets, plus signs and ovary lines. Accuracy matters because a small line above or below G changes superior and inferior ovary interpretation.

NCERT emphasizes three major angiosperm families: Fabaceae, Solanaceae and Liliaceae. Fabaceae, also called Leguminosae, includes pulses and has papilionaceous corolla, vexillary aestivation, diadelphous stamens and legume fruit. Solanaceae includes potato, tomato, brinjal and chilli; it usually has actinomorphic bisexual flowers, fused calyx and corolla, epipetalous stamens and berry or capsule fruit. Liliaceae includes onion, garlic, aloe and tulip; it is commonly monocot with parallel venation, perianth of six tepals, six stamens and tricarpellary syncarpous superior ovary. NEET questions frequently ask diagnostic floral characters, floral formulae, examples and economic uses such as pulses, medicines, vegetables, spices, ornamentals and fibres.