November 10, 2021 Alice Henneman
Examples of colonial green alga are Volvox, Synura and Scenedesmus.
Which of the following are colonial green algae?
Volvox is a colonial green alga. Chlamydomonas is a unicellular organism. Spirogyra is filamentous while Fucus is a plate-like thalloid, brown alga.
Is Fucus a colonial algae?
(A) Porphyra (B) Fucus (C) Gracillaria (D) Chara Page 62 answer Ans [B] Fucus is a brown algae i.e. belongs to Class Phaeophyta. In this alga the accumulation product of photosynthesis is D-mannitol (a sugar alcohol) and the reserve food material is laminarin.
What is colonial algae?
Colonial alga are algae in which cells resembling free swimming unicells form groups. They may be large and elaborately interconnected as in Volvox or smaller and relatively simple as in Synura. The individual cells divide longitudinally and the colonies also divide into two, as they grow larger.
Which is a colonial form?
Colonial organisms are clonal colonies composed of many physically connected, interdependent individuals. The subunits of colonial organisms can be unicellular, as in the alga Volvox (a coenobium), or multicellular, as in the phylum Bryozoa. The former type may have been the first step toward multicellular organisms.
Which is not colonial form of algae?
➡Algae which is not found in colonial form is ulothrix.
What is an example of a colonial organism?
In biology, typical examples of colonies are insect colonies. For example, an ant colony is comprised of ants that live closely together due to mutual benefits, such as to make stronger defense. Single-celled organisms can also form colonies, as coenobium is a colony of single-celled Volvox species.
Why do algae form colonies?
The green alga, Scenedesmus acutus, grows in culture in unicellular form, but it forms colonies (coenobia) when exposed for 48 h to a chemical released by the grazer Daphnia magna. The colony-forming response can be evoked only in growing cells. Colony formation can be interpreted as a grazing defense mechanism.
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