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Morphology of Flowering Plants
Aestivation
6 questions from 6 papers, each with its answer.
- questions
- 6
- papers
- 6
- years asked, 2017–2026
- 1 of 10
- of Morphology of Flowering Plants
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Appears in
Concepts tested
- Vexillary aestivation 3
- Aestivation
- Imbricate aestivation
- Twisted aestivation
All Questions
2022 Phase 2 1 question
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Match List - I with List - II. Choose the correct answer.
Pick the matching item from Column II for each row.
Column I
- A. Imbricate
- B. Valvate
- C. Vexillary
- D. Twisted
Column II
- I. Calotropis
- II. Cassia
- III. Cotton
- IV. Bean
Correct answer: A → II, B → I, C → IV, D → III
Imbricate: margins overlap but not in a particular direction, e.g. Cassia, gulmohur. Valvate: margins just touch each other, e.g. Calotropis. Vexillary: largest standard petal overlaps two wings which overlap two keel petals, e.g. pea, bean. Twisted: one margin overlaps the next regularly, e.g. china rose, lady's finger, cotton.
2015 AIPMT-I 1 question
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Keel is the characteristic feature of flower ofIn vexillary aestivation, the largest petal (standard) overlaps the two lateral petals (wings), which overlap the two smallest anterior petals forming the keel.
This is the distinguishing feature of Fabaceae, to which Indigofera belongs.
Tomato (Solanaceae) and Tulip and Aloe (Liliaceae) show valvate aestivation.
2014 AIPMT 1 question
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When the margins of sepals or petals overlap one another without any particular direction, the condition is termed as:In imbricate aestivation the margins of sepals or petals overlap one another but not in any particular direction, as in Cassia and gulmohur.
2012 AIPMT-PRE 1 question
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Vexillary aestivation is characteristic of the familyIn pea and bean flowers (family Fabaceae) there are five petals: the largest (standard) overlaps the two lateral petals (wings), which in turn overlap the two smallest anterior petals (keel).
This is vexillary or papilionaceous aestivation.
2010 AIPMT-MAINS 1 question
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Aestivation of petals in the flower of cotton is correctly shown inAestivation is the mode of arrangement of sepals or petals in the floral bud with respect to the other members of the same whorl.
In china rose, lady's finger and cotton, one margin of each petal overlaps the margin of the next petal, and so on in a regular manner; this is twisted aestivation.
In valvate aestivation the margins just touch without overlapping ($Calotropis$); in imbricate aestivation the overlapping is not in any particular direction ($Cassia$, gulmohur); in vexillary aestivation there is a standard, wings and keel (pea, bean).
The correct diagram for cotton is therefore the one in which every petal has one margin overlapping its neighbour and the other margin overlapped, all in the same direction (twisted).
2010 AIPMT-PRE 1 question
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Keel is characteristic of the flowers ofIn pea and bean flowers (family Fabaceae) there are five petals: the largest (standard) overlaps the two lateral petals (wings), which in turn overlap the two smallest anterior petals (keel).
This arrangement is called vexillary or papilionaceous aestivation; the two anterior petals are fused to form the boat-shaped keel that encloses the stamens and pistil.
Gulmohur and $Cassia$ have imbricate aestivation, and $Calotropis$ has valvate aestivation; they do not have a keel.
Hence the keel is characteristic of the flowers of bean.