Algae are known to reproduce asexually by variety of spores under the different environmental conditions . What are the spores and different conditions under which they are produced ?

1 Answer
Nov 27, 2016

Asexual reproduction takes place by the formation of various types of sporangia. The spores escape from the parent plants, undergo germination and give rise to new plants.


Algae reproduce asexually by a variety of spores such as ,

1) Zoospores : these are flagelated , often with an eyespot. Normally these are formed under favourable conditions e.g. Chlamydomonas.
In Vaucheria, compound zoospores called synzoospore are formed.

2) Aplanospores : these are non motile thin walled zoospores , formed by cleavage of protoplasts within a cell. They are formed under unfavourable conditions e.g. Ulothrix

3) Akinetes : these are formed under unfavourable conditions as method of perinnation. They are thick walled and non motile. On release they form new thalli e.g. Anabaena

4) Hypnospores: these are thick walled aplanospores and are formed during unfavourable conditions. Under prolonged unfavourable conditions the protoplasm of Hypnospores divides to make cysts e.g. Chlamydomonas nivalis.

5) Tetraspores : these are haploid thin walled non motile spores formed after reduction division in diploid tetrasporangia e.g. members of Rhodophyceae and Phaeophceae.

6) Autospores : these are similar to the parent cell. In Chlorella and Scenedesmus autospores acquire all characteristics of parent cells before their discharge from sporangium.