The classification of algae is based on:

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(D) The classification of algae into three main classes,namely $Chlorophyceae$,$Phaeophyceae$,and $Rhodophyceae$,is primarily based on the following c

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All the above

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(D) The classification of algae into three main classes,namely $Chlorophyceae$,$Phaeophyceae$,and $Rhodophyceae$,is primarily based on the following criteria:$1$. The type of photosynthetic pigments present (e.g.,chlorophyll $a$,$b$,$c$,$d$,$fucoxanthin$,$phycoerythrin$).$2$. The nature of the stored food material (e.g.,starch,$mannitol$,$laminarin$,$floridean$ starch).$3$. The composition of the cell wall (e.g.,cellulose,$pectin$,$algin$,$polysulphate$ esters).Therefore,all the given options are correct.

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Which plant group is considered 'thalloid' (lacking true roots, stems, and leaves)?

$A$ : Thallophytes are non-vascular,non-archegoniate and non-cormophytic plants.
$R$ : Thallophytes lack vascular bundles,archegonia and differentiated plant body.

Read carefully the given statements about algae and choose the correct option.
$I$. The plant body is thalloid.
$II$. Mainly aquatic.
$III$. Reproduction takes place by vegetative,asexual,and sexual methods.
$IV$. Volvox and Ulothrix are the colonial forms of algae.

Algae are important; we should study algae because

Which of the following is an unsuitable habitat for algae?

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