Question

15. Piston mechanism is found in
(a) Viola (6) Vallisnaria (c) Centaurea (d) Aster​

Answer 1

Answer:

ASTER is the right option

Explanation:

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Answer 2

Answer:      

The piston mechanism is found in Aster.

Explanation:

In the piston mechanism, the tip of the keel moves downwards under the pressure of the insect's weight. The anther and stigma are present as their own place and the pollen is released from the anther which gets pushed out through the hole in the tip of the keel. This method of dispersal of pollen helps in pollination.