Non-motile gametes are formed in :- | vedclass

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(D) In $Nostoc$ (a cyanobacterium),reproduction occurs through non-motile spores like akinetes,hormogonia,or heterocysts,and gametes are not formed in

Vedclass · Accepted Answer

$(1) \& (3)$ both

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(D) In $Nostoc$ (a cyanobacterium),reproduction occurs through non-motile spores like akinetes,hormogonia,or heterocysts,and gametes are not formed in the traditional sense as it is a prokaryote. However,in the context of algae and related organisms,$Polysiphonia$ (a red alga) is characterized by the complete absence of flagellated or motile stages in its life cycle,meaning its gametes are non-motile. $Fucus$ (a brown alga) produces motile male gametes (sperms). Therefore,both $Nostoc$ and $Polysiphonia$ represent organisms where motile gametes are absent. Thus,the correct option is $(1) \& (3)$.

Column-$I$	Column-$II$
$A$. Thalamiflorae	$p$. $6$
$B$. Disciflorae	$q$. $4$
$C$. Calyciflorae	$r$. $5$
$D$. Inferae	$s$. $3$

Column-$I$	Column-$II$
$(a)$ Gymnosperms	$(p)$ Trimerous flowers
$(b)$ Monocots	$(q)$ Absence of flowers
$(c)$ Dicots	$(r)$ Primitive type of flowers
$(d)$ Pteridophytes	$(s)$ Tetramerous or pentamerous flowers

Non-motile gametes are formed in $:-$

Similar Questions

Spirogyra differs from Mucor in having

Column-$I$ lists the series and Column-$II$ lists the number of orders in Bentham and Hooker's classification system. Select the correct option.
Column-$I$ Column-$II$
$A$. Thalamiflorae $p$. $6$
$B$. Disciflorae $q$. $4$
$C$. Calyciflorae $r$. $5$
$D$. Inferae $s$. $3$

Assertion : Like pteridophytes,sporophyte is a dominant phase in gymnosperms.
Reason : The gametophyte stages are independent in the pteridophytes.

Match the following columns:
Column-$I$ Column-$II$
$(a)$ Gymnosperms $(p)$ Trimerous flowers
$(b)$ Monocots $(q)$ Absence of flowers
$(c)$ Dicots $(r)$ Primitive type of flowers
$(d)$ Pteridophytes $(s)$ Tetramerous or pentamerous flowers

$A$ living fossil is .......

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