Morphology of Flowering PlantsNEET Botany · Class 11 · NCERT Chapter 4

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• Prop roots of Banyan arise from branches and grow downward. Stilt roots of Maize arise from lower stem nodes and grow obliquely downward.
• Pneumatophores grow UPWARD from waterlogged soil to get oxygen: Rhizophora and Avicennia mangroves.
• Haustoria of Cuscuta are parasitic adventitious roots that tap into the host vascular tissue.
• Sweet potato = tuberous ROOT. Potato = STEM tuber. Remember this distinction for NEET.

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• Potato eyes are nodes = it is a STEM tuber, NOT a root tuber. Sweet potato has no eyes/nodes = it is a ROOT tuber.
• Ginger and turmeric are rhizomes (horizontal underground stems with nodes and scale leaves).
• Cucurbita tendril = stem modification. Pea (Pisum sativum) tendril = leaf modification.
• Thorn (stem) vs Spine (leaf) vs Prickle (epidermal outgrowth): know which is which.

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• Reticulate venation = dicot (usually). Parallel venation = monocot (usually). Exceptions: Smilax is a dicot with parallel venation.
• Palmately compound: all leaflets from the TIP of the petiole (like Cannabis, Silk cotton).
• A deeply lobed leaf is STILL simple as long as incisions do not reach the midrib.
• Axillary bud is always at the base of the WHOLE LEAF (petiole), never at the base of a leaflet. Use this to tell compound from simple.

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• Sunflower head is a CAPITULUM (inflorescence), not a single flower. What you see as "petals" are sterile ray florets; disc florets in the centre produce seeds.
• Racemose: youngest flower at APEX (axis keeps growing). Cymose: oldest flower at APEX (axis terminates in flower).
• Catkin = drooping spike with unisexual flowers (Mulberry). Spadix = spike with fleshy axis in a spathe (Banana, Colocasia).
• Umbel: all pedicels from same point. Corymb: pedicels of different lengths but all flowers at same level. Both are racemose.

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• Epigynous = inferior ovary (ovary is BELOW; sepals, petals, stamens arise from above the ovary, as in Guava and Cucumber).
• Actinomorphic = any vertical plane gives two equal halves (Mustard, China rose). Zygomorphic = only one plane works (Pea, Bean).
• Apple: epigynous flower, inferior ovary, thalamus becomes the fleshy edible part. Therefore, apple is a FALSE fruit.
• Diadelphous stamens (9+1) = Pea family. Tetradynamous (4+2) = Mustard family. Monadelphous (all in one tube) = Hibiscus.

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• Apple is a FALSE fruit: the edible fleshy part is the THALAMUS, not the ovary. The papery core with seeds is the real fruit.
• Coconut layers: epicarp (outer green layer), mesocarp (fibrous husk), endocarp (hard brown shell). White flesh = endosperm. Water = liquid endosperm.
• Banana is a BERRY (seedless), not a drupe. No hard stone inside. Seeds are vestigial.
• Strawberry = aggregate + false fruit. Raspberry = aggregate (etaerio of drupelets). Mulberry = multiple (sorosis from catkin).

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• Scutellum = single cotyledon of monocot. Monocot = 1 cotyledon. Dicot = 2 cotyledons.
• Aleurone layer = outer protein layer of endosperm; secretes alpha-amylase during germination (triggered by gibberellin from embryo).
• In a non-endospermic dicot seed (pea, bean, gram), the COTYLEDONS store food. Endosperm is absent in the mature seed.
• Maize grain is a FRUIT (caryopsis): pericarp fused with seed coat. The entire grain is technically a fruit, not a seed.

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• Potato = stem tuber (has nodes/eyes). Sweet potato = root tuber (no nodes). This is the most common NEET trap in this chapter.
• Capitulum = most evolved inflorescence (Sunflower, Marigold). The whole "flower" is actually an inflorescence.
• Epigynous = inferior ovary. Hypogynous = superior ovary. Perigynous = half inferior.
• Pneumatophores: grow UPWARD for oxygen. Found in mangroves (Rhizophora, Avicennia).