BioSapience

1. Mostly type of zygospore in Ulothrix is:

Uniflagellate

Quadriflagellate

Multi-flagellate

Non-flagellate

2. Most of the algae along with other submerged plants usually float on water during the day time, while they sink at night, because :

They become buoyant by virtue of accumulation of oxygen in their cells as gas vacuole as a result of photosynthesis

They become comparatively light due to the loss of food material during respiration

They become lighter in weight as the fish and other aquatic animals utilize their parts as food

They come up to receive sunlight

3. Each chloroplast in Spirogyra bears :

A definite number of pyrenoids

An indefinite number of pyrenoids

No pyrenoids

Only single pyrenoid

4. ‘Pond silk’ or ‘Water silk’ is the common name of :

Ulothrix

Spirogyra

Oscillatoria

Mucor

5. On germination, each zygospore of Spirogyra divides meiotically into four, but the number of filaments produced is :

6. Heterotrichous habit means :

Whole plant body is prostrate

A portion of plant body is prostrate and another portion erect

None of the above is correct

Whole plant body is erect and aerial

7. The basal-cell by which an alga is attached to its substratum is known as :

Holdfast

Intercalary cell

Hypha

Rhizoid

8. Hormogonia are the vegetative reproductive structures of :

Spirogyra

Chlamydomonas

Ulothrix

Oscillatoria

9. True sexuality is not found in:

Blue-green algae

Green algae

Desmids

Diatoms

10. Heterocysts are found in :

Nostoc

Oscillatoria

Spirogyra

Chlamydomonas