Question

Write about structure of rhodophyceae.​

Answer 1

Some points on structure of rhodophyceae are as follows:-

1. Most of the alage are multicellular generally.

2. Complex cell wall is present as cell wall is made up of cellulose.

3. In the formation of cell wall pectin & polysulphate esters is required.

4. Secretion of calcium carbonate is possible by some of the algae.

5. Coral like structure is seen after the deposition of calcium carbonate.

6. There are some exceptions which may be unicellular as well

7. In them eukaryotic cell is found.

8. Parts of the plant like leaves, stem or roots are not present.

Answer 2

Explanation:

It is a large group of algae consisting of about 831 genera and over 5;250 species. They are commonly known as red algae due to the presence of a water soluble red pigment, r- phycoerythrin. The r-phycoerythrin is, however, present sufficiently and completely to mask the chlorophyll a, giving the characteristic red colouration. More than 98% members are marine and the rest grow in fresh water.

The fresh water members grow in stagnant water (e.g., Asterocystis, Compsopogon etc.) as well as in flowing water (e.g., Lamanea, Thorea, Batrachospermum etc.). The marine species have the ability to live at greater depth (even at 30-90 meters) than the other members of different classes. They also exhibit a high degree of para­sitism and epiphytism. The parasitic members show great reduction in their size and pigmenta­tion.