Xenia is a effect of pollen grains on
$A$ : In sporoderm, pectocellulosic layer is surrounded by sporopollenin. $R$ : Exine is differentiated into outer ektexine and inner endexine.
Functional megaspore in an angiosperm develops into an
Winged pollen grains are present in
In which of the following, parthenocarpy makes no sense?
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