Question

The single filament of Nostoc without mucilage sheath is known as a:

• A. colony
• B. mycelium
• C. hyphae
• D. trichome

Answer 1

The correct option is D

trichome

The correct option is option D.

Explanation of the correct option:

1. Nostoc belongs to the phylum cyanobacteria.
2. The body of Nostoc consists of many thread-like structures known as filaments.
3. A single-chain filament is called the trichome.
4. Trichome is without a mucilaginous sheet.

Explanation of the incorrect options:

Option A:

A group of bacteria, fungi, and other microorganisms in a solid agar plate is known as a colony.

Option B:

1. It is a root-like structure of the fungus.
2. It consists of thread-like branching structures known as hyphae.

Option C:

1. It is a long, branching filamentous structure.
2. It is collectively called mycelium.
3. Hyphae are present in fungi, oomycete, and actinobacterium.

Final answer: A single filament of Nostoc without mucilage sheath is known as a trichome.