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Aestivation and floral formulae
Concepts tested here
- Fabaceae, Liliaceae and Solanaceae
All Questions
2010 AIPMT-MAINS 1 question
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Consider the following four statements A, B, C and D and select the right option for two correct statements.
Statements
(A) In vexillary aestivation, the large posterior petal is called standard, two lateral ones are wings and two small anterior petals are termed keel
(B) The floral formula for Liliaceae is $\oplus$ ⚥ $P_{3+3}A_{3+3}\underline{G}_{(3)}$
(C) In pea flower the stamens are monadelphous
(D) The floral formula for Solanaceae is $\oplus$ ⚥ $K_{(3)}C_{(3)}A_{(4)}\underline{G}_{(2)}$
The correct statements are(A) is correct: in vexillary (papilionaceous) aestivation of pea and bean flowers, the largest posterior petal (standard) overlaps the two lateral petals (wings), which overlap the two smallest anterior petals (keel).
(B) is correct: a Liliaceae flower is actinomorphic and bisexual with six tepals in two whorls (3 + 3), six stamens (3 + 3) and a tricarpellary, syncarpous, superior ovary.
(C) is wrong: in pea the ten stamens are diadelphous, nine united in one bundle and one free; monadelphous stamens are found in china rose.
(D) is wrong: Solanaceae flowers are pentamerous; the correct formula is $\oplus$ ⚥ $K_{(5)}C_{(5)}A_5\underline{G}_{(2)}$ with epipetalous stamens.
Hence the correct statements are (A) and (B).