Wednesday, 24 February 2021

CBSE Class 8 Science - MCQ and Online Tests - Unit 2 - Microorganisms: Friend and Foe

CBSE Class 8 Science – MCQ and Online Tests –  Unit 2 – Microorganisms: Friend and Foe

Every year CBSE students attend Annual Assessment exams for 6,7,8,9,11th standards. These exams are very competitive to all the students. So our website provides online tests for all the 6,7,8,9,11th standards’ subjects. These tests are also very effective and useful for those who preparing for any competitive exams like Olympiad etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.

These online tests are based on latest CBSE syllabus. While attempting these, our students can identify their weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly


CBSE Class 8 Science – MCQ and Online Tests –  Unit 2 – Microorganisms: Friend and Foe

Choose the correct option in the following questions:

Question 1.
The disease caused by protozoa is
(a) tuberculosis
(b) polio
(c) typhoid
(d) malaria


Answer: (d) malaria

Question 2.
Which bacteria helps in settling of curd?
(a) Rhizobium
(b) Lactobacillus
(c) Vibriocholarae
(d) Bacillus


Answer: (b) Lactobacillus

Question 3.
Which cannot fix atmospheric nitrogen in the soil?
(a) Rhizobium
(b) Clostridium
(c) Azotobacter
(d) Penicillin


Answer: (d) Penicillin

Question 4.
What helps in the rise of bread or dosa dough?
(a) Heat
(b) Grinding
(c) Growth of yeast cells
(d) Low pressure


Answer: (c) Growth of yeast cells

Question 5.
The status of algae in the aquatic food chain is
(a) consumers
(b) producers
(c) host
(d) small in size


Answer: (b) producers

Question 6.
The rod shaped bacteria are called
(a) Bacillus
(b) Coccus
(c) Vibrio
(d) Spirillum


Answer: (a) Bacillus

Question 7.
Bacteria present in root nodules of pea
(a) Coli
(b) Plasmodium
(c) Rhizobium
(d) Penicillin


Answer: (c) Rhizobium

Question 8.
The microorganism which contains chlorophyll
(a) Virus
(b) Fungus
(c) Algae
(d) All


Answer: (c) Algae

Question 9.
Which of the following is not used as food preservatives?
(a) Salt
(b) Sugar
(c) Vinegar
(d) Methane


Answer: (d) Methane

Question 10.
The process by which amount of nitrogen remains the same in the atmosphere is known as
(a) fermentation
(b) carbon cycle
(c) nitrogen cycle
(d) photosynthesis


Answer: (c) nitrogen cycle

Question 11.
The disease caused by fungi is
(a) measles
(b) chicken pox
(c) polio
(d) ringworm


Answer: (d) ringworm

Question 12.
Which microorganism causes AIDS?
(a) A protozoa
(b) A bacteria
(c) A virus
(d) An algae


Answer: (c) A virus

Question 13.
Alcohol is produced with the help of
(a) sodium chloride
(b) yeast
(c) nitrogen
(d) carbon dioxide


Answer: (b) yeast

Question 14.
Which of the following drug is an antipyretic?
(a) Insulin
(b) Alcohol
(c) Streptomycin
(d) Paracetamol


Answer: (d) Paracetamol

Question 15.
Which of the following disease is spread due to bacteria?
(a) Tuberculosis
(b) Measles
(c) Chicken pox
(d) Polio


Answer: (a) Tuberculosis



Post a Comment

In Article

Definition List

Unordered List