What is the ratio of equational divisions tha | vedclass

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(C) In $Cycas$,the pollen grain undergoes two equational divisions to produce male gametes. The first division produces a prothallial cell and an anth

Vedclass · Accepted Answer

$2: 1$

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(C) In $Cycas$,the pollen grain undergoes two equational divisions to produce male gametes. The first division produces a prothallial cell and an antheridial cell,and the second division of the antheridial cell produces the tube cell and the generative cell,which eventually forms two male gametes. Thus,$2$ divisions are involved.In angiosperms,the microspore (pollen grain) undergoes one mitotic (equational) division to form a vegetative cell and a generative cell. The generative cell then undergoes one more mitotic division to form two male gametes. However,the question specifically asks for the divisions leading to the formation of male gametes from the pollen grain. In angiosperms,the generative cell divides once to form two male gametes,totaling $1$ division from the generative stage.Therefore,the ratio of equational divisions in $Cycas$ to angiosperms is $2: 1$.

What is the ratio of equational divisions that take place in Cycas and angiosperms respectively,leading to the formation of male gametes from pollen grains?

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