Question

Tubular and multinucleated alga is ______.

• A. Rhizopus
• B. Anabaena
• C. Parmelia
• D. Vaucheria

Hint:

Coenocytic algae like Vaucheria lack septa and contain many nuclei.

Answer 1

The Correct Option is D

Step 1: Understanding the terms.
Tubular and multinucleated organization refers to a coenocytic thallus, where the body is tube-like and contains many nuclei without cross walls.
Step 2: Characteristics of Vaucheria.
Vaucheria is a green alga that shows siphonous (coenocytic) organization. Its thallus is tubular and contains many nuclei within a continuous cytoplasm.
Step 3: Analysis of options.
(A) Rhizopus: A fungus, not an alga.
(B) Anabaena: Filamentous cyanobacterium with cells separated by septa.
(C) Parmelia: A lichen with a thalloid body, not tubular or multinucleated.
(D) Vaucheria: Correct, a coenocytic, tubular alga.
Step 4: Conclusion.
Vaucheria is the tubular and multinucleated alga.