Class 8 Science MCQ Micro Oraganisms Friends And Foe

Question :Yeast helps in the production of:
(a) sugar
(b) alcohol
(c) oxygen
(d) none of these

Question :Examples of Multicellular Microorganism are
(a) Algae, Bacteria
(b) Bacteria and Fungi
(c) Bacteria and Viruses
(d) Algae and Fungi

Question :Some medicines obtained from micro-organisms are applied to kill or stop the growth of disease-causing microorganisms. Such medicines are called ______.
(a) Antibodies
(b) Antibiotics
(c) Antiseptics
(d) All of the above

Question :The cause of whooping cough is
(a) bacteria
(c) virus
(b) fungi
(d) algae

Question :Virus is.
(a) non-living
(c) living as well as non-living
(b) living
(d) none of these

Question :Tuberculosis is a disease caused by:
(a) bacterium
(b) protozoan
(c) virus
(d) malnutrition

Question :BCG vaccine is used to curb:
(a) cholera
(b) tuberculosis
(c) polio
(d) typhoid

Question :Cholera is due to:
(a) virus
(b) fungus
(c) protozoan
(d) bacterium

Question :A common preservative used in jam and pickles is
(a) Sodium benzoate
(b) Nitric acid
(c) Sodium Chloride
(d) Copper Sulphate

Question :Rhizobium found in root nodules of leguminous roots is an
(a) Atmospheric Carbon fixer
(b) Atmospheric Oxygen fixer
(c) Atmospheric Nitrogen fixer
(d) All of the above

Question :Lactobacillus is commonly found in
(a) Cake
(b) Curd
(c) Bread
(d) All of the above

Question :In Pasteurisation the milk is heated to about:
(a) 100°C
(b) 50°C
(c) 70°C
(d) 110°C

Question : Scientist who discovered fermentation is
(a) Alexander Fleming
(b) Louis Pasteur
(c) John Mendal
(d) Edward Jenne

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

Question : Yeast is not used in the preparation of :
(a) bread
(b) alcohol
(c) dhokla
(d) antibiotic

Question : Which of the following enzymes is secreted by bacteria that can digest cellulose?
(a) Amylase
(b) Cellulase
(c) Lipase
(d) Protease

Question :The process of conversion of sugar into alcohol by yeast is called
(a) Fermentation
(b) Pasteurisation
(c) Alcoholism
(d) All of the above

Question :Penicillium is a
(a) Fungus
(b) Algae
(c) Bacteria
(d) Yeast

Question :Malaria Is caused by
(a) Protozoa
(b) Virus
(c) Algae
(d) Bacteria

Question :Rhizobium becteria
(a) Help in nitrogen fixation
(b) Help in digestion
(c) Cause diseases
(d) All of these

Question : The pores in the bread is due to gas bubbles of
(a) Oxygen
(b) Nitrogen di oxide
(c) Nitrogen
(d) Carbon di oxide

Question :Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called _______
(a) Medication
(b) Antibiotics
(c) Vaccination
(d) All of the above

Question : The microbe for Malaria is carried by
(a) Male Anopheles mosquito
(b) Female Anopheles Mosquito
(c) Male Aedes mosquito
(d) Female Aedes mosquito

Question :Microorganisms are
(a) Multi-cellular
(b) Unicellular
(c) Unicellular and multi-cellular
(d) None of the options

Question :Scientist who discovered fermentation is
(a) Louis pasteur
(b) Alexander fleming
(c) John mendal
(d) Edward jenner

Question :Amoeba belongs to
(a) Protozoa
(b) Algae
(c) Fungi
(d) Virus

Question :Mushroom belongs to
(a) Fungi
(b) Algae
(c) Virus
(d) None of the options

Question : Examples of Multicellular Microorganism are
(a) Algae, Bacteria
(b) Bacteria and Fungi
(c) Bacteria and Viruses
(d) Algae and Fungi

Question : Virus reproduce:
(a) only outside the cells of the host organisms
(b) only inside the cells of the host organisms
(c) both inside and outside the cells of the host organisms
(d) none of these

Question :Amount of nitrogen in the atmosohere is
(a) 0.78
(b) 0.58
(c) 0.68
(d) 0.88

Question :Vaccine for small pox is discorvered by
(a) Edward jenner
(b) Louis pasteur
(c) Alexander fleming
(d) John mendal

Question :Spyrogyra is
(a) A fungi
(b) An algae
(c) A protozoa
(d) A bacteria

Question : A plant disease called citrus canker is caused by a _________ .
(a) Virus
(b) Protozoa
(c) Bacteria
(d) Fungi

Question : What process takes place when yeast is added to grape juice and left for a week?
(a) Decomposition
(b) Fermentation
(c) Distillation
(d) Oxidation

Question : Malaria is spread by:
(a) plasmodium
(b) female anapheles mosquito
(c) male anapheles mosquito
(d) none of these

Question :Vegetable peels, remains of animals are organic wastes.

Question :Bacterium Rhizobium promotes the formation of curd.

Question :Viruses reproduce only inside the cells of the host organism.

Question :Typhoid is caused by protozoa.

Question :Polio is caused by viruses.

Question :All the micro organisms can be seen with the unaided eye.

Question :The process of conversion of sugar into alcohol is known as fermentation.

Question :Sodium bicarbonate is an antibiotic.

Question :Carrier of malaria-causing protozoan is housefly.

Question :The bread or idle dough rises because of growth of yeast cells.

Question :Cholera, common cold, chicken pox are communicable diseases.

Question :Some of the micro organisms growing on our food causes food poisoning.

Question :All micro organisms are unicellular.

Question :Yeast is used in the production of hydrochloric acid.

Question :Jams, jellies and squashes are preserved by sugar.

Question :Our atmosphere has ___________________ nitrogen gas.

Question :Micro organisms are organisms that cannot be seen by ___________________ eye.

Question :___________________ is mode of transmission of disease citrus canker.

Question :___________________ is used to preserve meat and fish.

Question :___________________ discovered penicillium.

Question :When a disease-carrying microbe enters our body, the body produces ___________________ to fight the invader.

Question :Medicines called ___________________ kill or stop the growth of the disease causing micro organisms.

Question :Microbial diseases that can spread from an infected person to a healthy person through air, water or physical contact are called ___________________ .

Question :___________________ mosquito acts as carries of dengue virus.

Question :___________________ discovered the vaccine for small pox.

Question :AIDS is caused by virus called ___________________ virus.

Question :Disease causing micro organisms are called ___________________ .

Question :Penicillium is an example of ___________________ .

Question :___________________ promotes the formation of curd.

Question :Blue green tilgae fix ___________________ directly from air to enhance fertility of soil.

Question :Pasteurisation prevents the growth of ___________________ in milk.

Question :Mode of transmission of disease ‘Yellow vein mosaic of bhindi is ___________________ .

Question :Diseases like polio and chicken pox are caused by _______
(a) Bacteria
(b) Fungi
(c) Virus
(d) Worms

Question :Micro-oganisrn decompose the organic waste and dead plants and animals into ___________________ substances and clean up the environment.

Question :Micro-organism can be seen with the help of a ___________________ .

Question :Microbes are of five kinds (a) ___________________. (b) ___________________. (c) ___________________ (d) ___________________ (e) ___________________