Class 8 | Micro-Organism Friend and Foe | Science NCERT MCQ Worksheet - 2

1. Which bacteria helps in settling of curd?

Rhizobium
Vibriocholarae
Bacillus
Lactobacillus

2. _____________- are the smallest of all microorganisms.

Bactria
Viruses
Protozoa
Algae

3. Fungi consist of two main groups of organisms - __________ and moulds.

Algae
Coccus
Yeast
Virus

4. Moulds are aerobic but some yeasts can survive in both aerobic and ____________ conditions.

absorbic
anaerobic
probiotic
None of the above

5. The presence of ___________ and the warmth stimulate rapid growth of the yeast cells.

salt
sugar
methane
carbon di oxide

6. Protozoa are __________ just as algae are plant like.

plant like
animal like
both the above
None of the above

7. The process by which amount of nitrogen remains the same in the atmosphere is known as

carbon cycle
nitrogen cycle
fermentation
photosynthesis

8. Which of the following is not used as food preservatives?

Methane
Vinegar
Salt
Sugar

9. Which of the following disease is spread due to bacteria?

Measles
Chicken pox
Tuberculosis
Polio

10. Which microorganism causes AIDS?

Algae
Virus
Fungus
Protozoa

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