What is the ratio of equational divisions tha | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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

$2: 1$

Vedclass · Answer

(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 $2: 1$.

Column-$I$	Column-$II$
$(p)$ Intine	$(v)$ Long structure
$(q)$ Exine	$(w)$ Nutrition to pollen grain
$(r)$ Pollen tube	$(x)$ Sporopollenin
$(s)$ Tapetum	$(y)$ Pectin,cellulose
	$(z)$ Glycogen

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?

Similar Questions

Gametes formed by meiosis are called

In . . . . . . ,pollen grains are long and ribbon-like.

Match the following:
Column-$I$ Column-$II$
$(p)$ Intine $(v)$ Long structure
$(q)$ Exine $(w)$ Nutrition to pollen grain
$(r)$ Pollen tube $(x)$ Sporopollenin
$(s)$ Tapetum $(y)$ Pectin,cellulose
$(z)$ Glycogen

Which of the following plants produce seeds and possess a pollen tube?

Select the incorrect statement from the following.

Vedclass Test Series

Exam Paper Generator

Online Exam Module