Question

Some of the flowers developed seeds although insects had not visited them. Suggest how seed formation could occur in the flowers not visited by insects.

Answer 1

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By looking at pollen grains.

Answer 2

A. Salvia is pollinated by insects by the turn pipe mechanism.

B. Fig is pollinated by a wasp. The wasp lays egg in the fig fruits and in turn fig is pollinated.

C. Commelina is a cleistogamous flower which never opens. The pollen from anther lobe fall on the stigma of the same flower and thus, pollination is not dependent on any external agency i.e. pollinators.

D. Zostera is a marine grass which is pollinated inside water.

Hence, seed setting is assured even in the absence of pollinating agents in Commelina.

So, the correct answer is 'Commelina'.