Types of Aestivation in Flowers — NEET Biology
✅ Asked in NEET 2022Match List-I (Aestivation type) with List-II (Examples): List-I (Aestivation) (a) Imbricate (b) Valvate (c) Vexillary (d) Twisted List-II (Example) (i) Calotropis (ii) Cassia (iii) Cotton (iv) Bean Choose the correct answer from the options given below: [NEET -2022]
Match List-I (Aestivation type) with List-II (Examples): List-I (Aestivation) (a) Imbricate (b) Valvate (c) Vexillary (d) Twisted List-II (Example) (i) Calotropis (ii) Cassia (iii) Cotton (iv) Bean Choose the correct answer from the options given below: [NEET -2022]
Answer & NCERT explanation
Correct answer: C — -(ii), (b)-(i), (c)-(iv), (d)-(iii)
Imbricate aestivation has overlapping petals with irregular arrangement - seen in Cassia (a-ii). Valvate aestivation has petals touching at edges without overlap - found in Calotropis (b-i). Vexillary aestivation is specific to legumes like Bean with standard, wing, and keel petals (c-iv). Twisted aestivation has petals arranged in twisted manner - characteristic of Cotton family (d-iii).
Read more NCERT concept on the PYQ
Aestivation: The mode of arrangement of sepals or petals in floral bud with respect to the other members of the same whorl is known as aestivation. The main types of aestivation are valvate, twisted, imbricate
Aestivation describes how sepals or petals arrange themselves in a flower bud. The three main types are valvate (edges touching without overlapping), twisted (one sepal/petal overlaps the next in a spiral), and imbricate (some members overlap while others don't). Students often confuse these arrangements and mix them up with vernation (leaf arrangement). To avoid errors, remember that aestivation applies specifically to floral parts in buds and visualize each type: valvate = edges meet, twisted = spiral pattern, imbricate = irregular overlapping. NEET asks students to identify types from diagrams or describe which flowers show specific aestivation patterns.
What does NCERT say about Aestivation mode arrangement sepals?
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