Science Practice Quiz 239

Q1.What is unique about the reproduction of viruses?

A. They reproduce outside the host organism B. They reproduce only inside the host organism C. They reproduce in air and water D. They reproduce in soil and plants

Q2.What is a beneficial role of some microorganisms?

A. They cause diseases in plants and animals B. They decompose organic waste and dead plants and animals C. They produce toxins in the environment D. They reduce soil fertility

Q3.What disease is caused by protozoans?

A. Dysentery and malaria B. Tuberculosis and cancer C. Diabetes and hypertension D. AIDS and Alzheimer's

Q4.What is the role of some bacteria in the soil?

A. They fix nitrogen from air into soil B. They convert nitrogenous compounds into nitrogen gas C. They produce toxins in the soil D. They reduce soil fertility

Q5.What is the effect of some microorganisms on food?

A. They increase the nutritional value of food B. They preserve food for a longer period C. They cause food poisoning D. They reduce the shelf life of food

Q6.What are the round structures called on the roots of a gram or bean plant?

A. Root hairs B. Root nodules C. Stem cells D. Leaf buds

Q7.What happens when the balloon from test tube B is fitted onto a test tube filled with lime water and shaken well?

A. The lime water turns red B. The balloon inflates further C. The lime water turns milky D. The lime water remains unchanged

Q8.What is the role of antibiotics in our lives?

A. To harm microorganisms B. To fix atmospheric nitrogen C. To produce carbon dioxide D. To harm human cells

Q9.What is the purpose of the experiment involving test tubes A and B, sugar, yeast, and balloons?

A. To demonstrate the harmful effects of microorganisms B. To show the usefulness of antibiotics C. To observe the production of carbon dioxide D. To fix atmospheric nitrogen

Q10.What are the two broad classifications of natural resources?

A. Renewable and Non-Renewable B. Inexhaustible and Exhaustible C. Living and Non-Living D. Natural and Man-made

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Science Practice Quiz 239