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Question

(B) The $Palmella$ stage is a survival mechanism observed in certain algae like $Chlamydomonas$.During unfavourable conditions,such as drought or lack

Vedclass · Accepted Answer

During unfavourable conditions

Vedclass · Answer

(B) The $Palmella$ stage is a survival mechanism observed in certain algae like $Chlamydomonas$.During unfavourable conditions,such as drought or lack of water,the flagella of the zoospores are withdrawn,and the cells become non-motile.These cells secrete a mucilaginous sheath around themselves,and they may divide to form a colony-like structure embedded in the mucilage.This aggregation is known as the $Palmella$ stage.When favourable conditions return,these cells are released and develop into new individual plants.

Column-$I$	Column-$II$
$A$. Blue-green algae	$i$. Spirogyra
$B$. Unicellular algae	$ii$. Nostoc
$C$. Filamentous algae	$iii$. Volvox
$D$. Colonial algae	$iv$. Chlamydomonas

Column $I$	Column $II$
$a.$ Shallowest depth	$(i)$ Green algae
$b.$ Intermediate depth	$(ii)$ Brown algae
$c.$ Greatest depth	$(iii)$ Red algae

The $Palmella$ stage is produced:

Similar Questions

Match the following columns:
Column-$I$ Column-$II$
$A$. Blue-green algae $i$. Spirogyra
$B$. Unicellular algae $ii$. Nostoc
$C$. Filamentous algae $iii$. Volvox
$D$. Colonial algae $iv$. Chlamydomonas

Which of the following pairs is incorrect?

The non-motile,greatly thickened asexual spores are called

In $Spirogyra$,which of the following statements is correct?

Match Column $I$ with Column $II$ and choose the correct option:

Column $I$ Column $II$

$a.$ Shallowest depth $(i)$ Green algae

$b.$ Intermediate depth $(ii)$ Brown algae

$c.$ Greatest depth $(iii)$ Red algae

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