Question

Heterotrichous habit is shown by
A. Stigeoclonium
B. Chlamydomonas
C. Oedogonium
D. Ulothrix

Answer 1

Hint: It is green algae of the family Chaetophoraceae. In green algae, a heterotrichous habit is the most highly developed type of habit.

Complete Answer:
Heterotrichy means plants, namely prostrate branches and erect branches that produce two types of branches. The erect filament system arises in the plant body from the prostate filament system. Branches are positioned only above the ground in prostrate branches, while branches are kept up in erect.

Now, let us find the solution from the options-
- Heterotrichy means producing branches of two kinds. Both of the branches in Stigeoclonium are well known.
- Chlamydomonas is also green algae in which heterotrichous habit is not seen. Therefore, the option B is incorrect.
- Oedogonium is a free-living algae but it does not show heterotrichous habit. Therefore, the option C is incorrect.
- Ulothrix is a non-branching green algae which does not show heterotrichous habit. Therefore, the option D is incorrect.

Thus, the correct answer is option A Stigeoclonium.

Note: The most frequently seen heterotrichous habit is in green algae such as Fritschiella, Draparnaldia, etc. Only the prostate structure is well established in some algae, e.g. Scutata, Coleochaete. Heterotrichy, in Chaetophorales, is dominant.