Question

Algae are classified as?

Answer 1

Algae:

1. Algae are usually aquatic i.e. found in freshwater or marine water.
2. Some are terrestrial and occur in moist soil, tree trunk, moist rocks and walls.
3. They have a thallus like plant body i.e. not differentiated into root, stem and leaves.
4. They are autotrophic.
5. Reserve food material is basically starch.
6. They can reproduce by any of three methods : (1) Vegetative Method, (2) Asexual Method, (3) Sexual Method
7. Vascular and mechanical tissues are absent.

There are mainly 3 types of Algae :-

1. Rhodophyta (Red Algae)

• Red algae are predominately marine, it is an ancient group of algae without non-flagellate cells.
• They imparts red colour due to predominance of phycobillins pigment.
• Agar- agar is obtained from Gelidium and Gracilaria which are red algae.

2. Phaeophyta (Brown Algae)

• All brown algae are usually marine and found in both tidal and subtidal regions.
• They are the highly evolved forms as the plants display highest degree of differentiation.
• Example :- Sargassum, Laminaria, Fucus etc.

3. Chlorophyta (Green Algae)

• The species included in this class are generally green in colour due to predominance of chlorophyll pigment.
• Green algae occurs in all types of moist habitats.
• Example :- Ulothrix, Chara, Ulva etc.