Match the organisms in Column A with their action in Column B.
(i) Bacteria(a) Fixing nitrogen
(ii) Rhizobium(b) Setting of curd
(iii) Lactobacillus(c) Baking of bread
(iv) Yeast(d) Causing malaria
(v) A protozoan(e) Causing cholera
(vi) A virus(f) Causing AIDS
(g) Producing antibodies

AcademicBiologyNCERTClass 8

Correct Answer:

(i) Bacteria
(e) Causing cholera
(ii) Rhizobium
(a) Fixing nitrogen
(iii) Lactobacillus
(b) Setting of curd
(iv) Yeast
(c) Baking of bread
(v) A protozoan
(d) Causing malaria
(vi) A virus
(f) Causing AIDS


Cholera is an acute diarrheal sickness caused by an infection with the Vibrio cholerae bacterium in the bowel.

Biological nitrogen fixation (BNF) refers to the process by which atmospheric nitrogen is transformed into usable nitrogen compounds by bacteria such as rhizobium, present in the root nodules of leguminous plants. Some blue-green algae also contribute to the fixation of atmospheric nitrogen.

Lactobacillus is a species of bacterium that generates lactic acid as a byproduct of glucose metabolism. This is a "friendly" bacteria that generally resides disease-free in our digestive, urinary, and genital systems. This is utilized in the commercial manufacturing of sour milk, cheeses, and yogurt.

Fermentation is a chemical process in which carbohydrates, such as starch and glucose, are broken down anaerobically (without oxygen) by microorganisms (yeasts, bacteria, and moulds) that get energy from the process.

Plasmodium, a microscopic, single-celled protozoan organism, is responsible for causing malaria. The female Anopheles mosquito is the carrier of Plasmodium and spreads malaria from one person to another. Plasmodium reproduces by the asexual method of reproduction known as multiple fission.

AIDS (Acquired Immuno Deficiency Syndrome) is the last stage of HIV (Human Immunodeficiency Virus) infection caused by the weakened immune system, infected by a virus. It interferes with the body's ability to combat infection.

Updated on 10-Oct-2022 12:46:41