Oscillatoria

1. Heterocyst is absent in 

A. Nostoc

B. Scytonema

C. Gleotrichia

D. Oscillatoria

Ans . D

2. Oscillatoria is named on 

A. It's gliding movement

B. Oscillatory movement

C. Oscillatory flagella 

D. Creeping movement

Ans . B

3. Gaidukov phenomenon or charomatic adaptation occurs in

A. Oscillatoria 

B. Gleotrichia

C. Saragassum

D. Chara

Ans . A

4. In Oscillatoria gas vacuoles are formed when 

A. Light intensity is low

B. Light intensity is high

C. Temperature  is low

D. Oxygen concentration is high

Ans . A 

5. What is false about of oscillatoriaceae 

A. All cells of filament are alike .

B. All cells of filament can divide .

C. Heterocyst is intercalary .

D. Trichomes have an envelop of mucilagenous seath .

Ans . C 

6. Gaidukov phenomenon is 

A. Capacity to change colour in different wavelengths of light .

B. Nitrogen fixation process

C. Capacity to absorp plenty of oxygen

D. None 

Ans . A 

Trichothallic growth occurs in

A.  Oscillatoria

B. Gleotrichia

C. Rivularia

D. Both B and C 

Ans D