F.A.-2 SCIENCE GRADE-8

Penicillin was discovered by

• Edward Jenner

• Louis Pasteur

• Alexander Fleming

• Robert Brown

Cold, influenza and most cough are caused by ___?

• Bacteria

• Viruses

• Fungi

• None of these

The process of conversion of sugar into alcohol is known as ...

• Budding

• Fusion

• Fermentation

• Fixation

The microorganisms that cause diseases in human beings, plants and animals are called _

• Carriers

• Spirogyra

• Pathogens

• Antibodies

A preparation of weakened or killed pathogens.

• Bacteria
• Antibiotic Resistance
• Vaccine
• Capsid

Bacteria is known as ______________ in an ecosystem when feeding on dead organisms.

• decomposers
• herbivores
• pathogens
• infections

Are microorganisms helpful or harmful?

• Helpful
• Harmful
• Both
• Neither

A tiny, nonliving particle that invades and then reproduces inside a living cell.

• Bacteria
• Virus
• Protist
• Fungi

Which of the following statements about freezing as a method of food preservation is INCORRECT?

• It helps to slow down the growth of food spoiling bacteria.

• It kills the bacteria present in the food.

• It helps to slow down the enzyme activity of food spoiling bacteria

• The water inside the food freezes into ice crystals

Rayon is the different from synthetic fiber because

• it has a silk like appearance

• it is obtained from wood pulp

• its fibers can also be woven like those of natural fibers

• All the above