NTA Abhyas NEET2020BotanyMorphology of Flowering PlantsPractice
In Calotropis, the leaves show (X) phyllotaxy while the petals show (Y) aestivation.
Options
- A( X ) : opposite and ( Y ) : valvate
- B( X ) : alternate and ( Y ) : valvate
- C( X ) : opposite and ( Y ) : twisted.
- D( X ) : alternate and ( Y ) : twisted
Correct answer
A. ( X ) : opposite and ( Y ) : valvate
Step-by-step solution
When sepals or petals in a whorl just touch one another at the margin, without overlapping, it is said to be valvate. If one margin of the appendage overlaps that of the next one and so on, it is called twisted. Calotropis has valvate aestivation. In alternate type of phyllotaxy, a single leaf arises at each node in alternate manner. In opposite type, a pair of leaves arise at each node and lie opposite to each other as in Calotropis.