Plant Morphology - NEET 2026

Morphology of Flowering Plants

Root, stem, leaf, flower, fruit, seed — their types, modifications, and diagnostic features.

Root

Tap root: Dicots — primary root from radicle persists. Modifications: storage (carrot, radish, turnip), respiratory (pneumatophores in Rhizophora), supportive.

Fibrous root: Monocots — primary root short-lived, replaced by adventitious roots from stem base.

Adventitious roots: Arise from non-radicle parts (stem, leaf). Prop roots (Banyan), stilt roots (Maize), climbing roots (Pothos), storage roots (Sweet potato = tuberous), sucking roots/haustoria (Cuscuta — parasite).

Stem Modifications

Underground stems: Rhizome (Ginger, Turmeric), Corm (Colocasia/Arbi), Bulb (Onion), Tuber (Potato — has eyes = nodes with buds).

Sub-aerial: Runner (Grass), Stolon (Jasmine), Sucker (Chrysanthemum), Offset (Pistia, Eichhornia).

Aerial: Tendril (Passiflora), Thorn (Citrus, Bougainvillea), Phylloclade (Opuntia — flattened green stem), Bulbil (Agave).

Leaf & Venation

Parts: Leaf base (stipules in some), petiole, lamina.

Venation: Reticulate (dicots — Mango, Tulsi). Parallel (monocots — Grass, Banana).

Phyllotaxy: Alternate (China rose), Opposite (Calotropis), Whorled (Alstonia).

Leaf modifications: Tendrils (Pea), Spines (Cactus, Aloe), Pitcher (Nepenthes), Bladder (Utricularia), Scale leaves (bulb scales).

Simple vs Compound: Simple = one undivided lamina. Compound = divided into leaflets. Pinnate (Neem) vs Palmate (Silk cotton).

Flower — Floral Formula

Parts (acropetal): Calyx (sepals) → Corolla (petals) → Androecium (stamens) → Gynoecium (pistil).

Symbols: ⊕ = actinomorphic; ↑ = zygomorphic; ♀ = bisexual; ♂ = male; K = calyx; C = corolla; A = androecium; G = gynoecium; overline G = superior ovary; underline G = inferior ovary.

Fabaceae (Pea family): ↑K(5)C1+2+(2)A(9)+1G1 — papilionaceous corolla, diadelphous stamens.

Solanaceae: ⊕K(5)C(5)A5G(2) — epipetalous stamens, bicarpellary.

Liliaceae: ⊕P3+3 or (3+3)A3+3G(3) — monocot, trimerous.

Fruit Types & Seed

True fruit: Develops from ovary only. False fruit (pseudocarp): Other parts also contribute — Apple (thalamus), Strawberry (thalamus), Cashew (peduncle).

Simple fruits: Drupe (Mango — mesocarp edible, stony endocarp), Berry (Tomato, Banana), Nut (Litchi), Capsule (Cotton).

Aggregate: From multiple free carpels (Strawberry, Raspberry). Multiple (composite): From inflorescence (Jackfruit, Mulberry).

Seed: Seed coat (testa + tegmen) + cotyledon(s) + embryo. Castor = endospermic dicot. Orchid = smallest seed. Lodoicea = largest seed.

Morphology Fact Vault

High-yield direct recall facts for NEET.

Root Modifications — Storage

Carrot: Fusiform tap root
Radish: Napiform tap root
Turnip: Napiform tap root
Sweet potato: Tuberous adventitious
Dahlia: Fasciculated adventitious

Carrot = orange, conical (fusiform). Turnip = spherical (napiform). Beet = storage tap root

Stem Modifications (Underground)

Ginger: Rhizome (horizontal)
Turmeric: Rhizome
Onion: Bulb (leaf scales)
Garlic: Bulb (cloves = scale leaves)
Potato: Stem tuber (has eyes/nodes)
Arbi (Colocasia): Corm (solid)

Potato eyes = nodes with axillary buds — proof it's a stem, not root. Sweet potato = root tuber (no eyes)

Families — Key Features

Fabaceae: Papilionaceous, diadelphous
Solanaceae: Epipetalous, bicarpellary
Liliaceae: Trimerous (monocot)
Brassicaceae: Cruciform, tetradynamous

Economic importance — Fabaceae: pea, soybean; Solanaceae: potato, tomato, brinjal; Liliaceae: onion, garlic

False Fruits (Pseudocarps)

Apple: Thalamus swells
Strawberry: Thalamus
Cashew: Peduncle (cashew apple)
Mulberry: Multiple fruit (perianth)
Fig: Syconus (hollow receptacle)

True fruit = only from ovary. False fruit = other floral parts also contribute to fruit

Worked Examples

Morphology generates 2–4 NEET questions each year — very high return per hour of study.

EasySweet potato is a modified: (A) Tap root (B) Stem (C) Adventitious root (D) Rhizome▾

Sweet potato is a tuberous adventitious root. It arises from stem/node areas, stores food, and has no nodes or eyes (unlike potato which is a stem tuber). Root modifications for storage: Fusiform (carrot), Napiform (radish), Conical (carrot), Tuberous adventitious (sweet potato, Dahlia).

Answer: (C) Adventitious root

MediumWhich of the following is an aggregate fruit? (A) Apple (B) Jackfruit (C) Strawberry (D) Mango▾

Aggregate fruit = develops from a single flower with MULTIPLE FREE carpels (apocarpous gynoecium). Each carpel becomes a fruitlet. Example: Strawberry (the red fleshy part is thalamus — actually a false aggregate!), Raspberry, Magnolia. Jackfruit = Multiple fruit (from whole inflorescence). Apple = False fruit (thalamus). Mango = Simple drupe.

Answer: (C) Strawberry

Note: Strawberry is technically a false fruit — the fleshy part is thalamus, the real fruits are the small achenes on the surface

HardIdentify the correct floral formula for Fabaceae (Pea family):▾

(A) ⊕K(5)C(5)A5G(2) (B) ↑K(5)C1+2+(2)A(9)+1G1 (C) ⊕P3+3A3+3G(3) (D) ↑K5C5A∞G∞

Fabaceae (Pea, Bean, Gram): Zygomorphic (↑), K=5 fused sepals, Papilionaceous corolla C=1 (standard/vexillum) + 2 (wings/alae) + (2 fused keels/carinae), Diadelphous stamens A=(9)+1, simple pistil G=1 superior ovary. (A) = Solanaceae. (C) = Liliaceae (monocot). (D) = some Ranunculaceae.

Answer: (B) ↑K(5)C1+2+(2)A(9)+1G1

Mistake DNA

Classic NEET traps in morphology — memorise these fixes.

❌ Confusing Potato (stem) with Sweet Potato (root)

Potato = underground STEM tuber. Has nodes (eyes), internodes, scale leaves. Potato is modified stem. Sweet potato = adventitious ROOT tuber. Has no nodes or eyes. NEET asks this almost every year.

Fix: Potato has EYES (nodes) → stem. Sweet potato has NO eyes → root. "The eye is the window to the stem."

❌ Calling Apple a true fruit

Apple is a FALSE FRUIT (pseudocarp) because the fleshy edible part develops from the THALAMUS (receptacle), not from the ovary. Only the core (with seeds) is the true fruit. Similarly Strawberry and Cashew (peduncle swells).

Fix: True fruit = from ovary only. Apple, strawberry, cashew = thalamus/other parts enlarge → false/pseudo.

❌ Mixing up diadelphous and polyadelphous stamens

Fabaceae (pea): DIADELPHOUS = stamens in 2 bundles: (9)+1. The 9 are fused, 1 is free. Citrus: POLYADELPHOUS = stamens in many bundles. Lily: POLYANDROUS = stamens free and many. NEET specifically tests diadelphous.

Fix: Di = 2 bundles. Pea = (9)+1 = diadelphous. Not polyadelphous (that's Citrus).

Chapter Intelligence

PYQ Frequency

Root modifications: 1 Q/year
Stem modifications: 1 Q/year
Floral formula/family: 1 Q/year
Fruit types: 1 Q/2 years

2026 Prediction

High: Potato vs Sweet potato question (asked almost every year)
Expected: Floral formula identification (Fabaceae/Solanaceae)
Watch: False fruit examples (Apple, Cashew)

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