In deciduous type calyx, the sepals fall off.

As soon as flower opens

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After fertilization

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In the bud condition

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All the above

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Solution

The correct option is A As soon as flower opens
Ageratum conyzoides have caduceus calyx in which sepals fall just after the opening of the flower.
Withania somnifera have the persistent calyx that is present in the fruits too.
Brassica campestris and Argemone mexicana has deciduous calyx in which sepals fall off along with petals.
Thus, the correct option is A.

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