Question

explain briefly chlorophyceae, phaeophyceae, rhodophyceae​

Answer 1

Answer:

The Chlorophyceae are one of the classes of green algae, distinguished mainly on the basis of ultrastructural morphology

The brown algae, comprising the class Phaeophyceae, are a large group of multicellular algae

The Rhodophyta comprises one of the largest phyla of algae

Answer 2

Chlorophyceae ( Green algae )  :-

• Plant body - Unicellular, colonial or filamentous .

• Cell wall- Rigid cell wall made up of an inner layer of cellulose and outer layer of pectose.

• Pigments - Chlorophyll a, b.

• Stored food - Starch and protein in the form of pyrenoids.

• Some of them store food in the form of oil droplets.

 Modes of reproduction :-

• Vegetative - Fragmentation

• Asexual - Flagellated zoospores

• Sexual - Isogamy, Anisogamy, Oogamy

 Examples :-

• Ulothrix

• Chlamydomonas

• Spirogyra

• Chara

Phaeophyceae  ( Brown algae )  :-

• Plant body - Simple branched, filamentous with a hold fast for attachment, stalk called stipe and leaf like frond.

• Cell wall - cellulose with gelatinous coating of algin .

• Pigments - Chlorophyll a, c, Carotenoids, Xanthophyll, Fucoxanthin .

• Stored food - Laminarin, Mannitol .

 Mode of reproduction :-

• Vegetative - fragmentation

• Asexual - Diflagellate zoospores

• Sexual - Isogamy , Anisogamy , Oogamy

Examples :-

• Ectocarpus

• Dictyota

• Sargassum

• Fucus

Rhodophyceae ( Red algae )  :-

• Plant body - Complex, multicellular .

• Cell wall - Cellulose .

• Pigments - Chlorophyll a, d, Phycoerythrin .

• Stored food - Floridean starch .

Mode of reproduction :-

• Vegative - Fragmentation

• Asexual - Non - motiles spores

• Sexual - non- motile gametes

Examples :-

• Polysiphonia

• Porphyra

• Gracilaria

• Gelidium