Assertion : Conifer trees produce a large qua | vedclass

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(A) In $Pinus$, a conifer tree, microspores are produced by microsporogenesis in the microsporangium.Each microsporangium has an inner nourishing laye

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(A) In $Pinus$, a conifer tree, microspores are produced by microsporogenesis in the microsporangium.Each microsporangium has an inner nourishing layer known as the tapetum.$A$ large number of dusty and two-winged microspores (pollen grains) are produced.On maturity, the microsporangium wall bursts, and microspores are released into the air, which is often referred to as a "shower of sulphur."These pollen grains are dispersed by wind specifically due to the presence of wings, which provide buoyancy.Therefore, the presence of wings is the reason why they are efficiently wind-borne in large quantities.

Assertion : Conifer trees produce a large quantity of wind borne pollen grains.
Reason : The pollen grains have wings.

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Assertion : Conifer trees produce a large quantity of wind borne pollen grains.Reason : The pollen grains have wings.