Question

Heterotrichous habit is common among
A. Brown algae
B. Red algae
C. Yellow-green algae
D. Green algae

Answer 1

Hint: It occurs mostly in the members of the division Chlorophyta.

Complete answer:
Heterotrichous habit is the most highly evolved and advanced type of habit in green plants. Heterotrichy is the ability of the plants to produce two types of branches. The two types of branches are:
- Prostrate branches are also called a prostrate system.
- Erect branches are also called erect systems.

Additional information
> Heterotrichous means different filaments, in the case of green algae mostly two filaments.
> Erect system of filaments in the plant body develops from the prostrate system of filaments.
> In prostrate branches, the branches lie just above the ground whereas, in erect branches, branches are held erect.
> The prostrate shrubs have a horizontal or a sub-erect axial shoot as they grow for a long time in length but for a limited time in thickness.
> The prostrate system of branches is the characteristic feature of woody plants.
> The erect system of branches is the characteristic feature of most trees and shrubs.

So, the correct answer is Green algae.

Note: Heterotrichous habit is most commonly found in green algae like Fritschiella, Draparnaldia, etc. In heterotrichous habit, the thallus is differentiated into a prostate portion and an upright or projecting system.