List four benefits to human life by eliminating the use of CFCs

Subject

Biology

Class

CBSE Class 12

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

1.

Name the type of cross that would help to find the genotype of a pea plant bearing violet flowers.

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2.

State two postulates of Oparin and Haldane with reference to origin of life.

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3.

A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome this problem.

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4.

What are Cry genes ? In which organism are they present ?

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5.

An electrostatic precipitator in a thermal power plant is not able to generate high voltage of several thousands. Write the ecological implication because of it.

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6.

A pollen grain in angiosperm at the time of dehiscence from an anther could be 2-celled or 3-celled. Explain. How are the cells placed within the pollen grain when shed at a 2-celled stage ?

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7.

Differentiate between the genetic codes given below : (a) Unambiguous and Universal (b) Degenerate and Initiator

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8.

Mention one application for each of the following : (a) Passive immunization (b) Antihistamine (c) Colostrum (d) Cytokinin-barrier

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9.

Name the microbes that help production of the following products commercially : (a) Statin (b) Citric acid (c) Penicillin (d) Butyric acid

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10.

List four benefits to human life by eliminating the use of CFCs .


(1) Ozone depletion will be prevented.
(2) Green house effect will be controlled
(3) Global warming will be controlled.
(4) It will prevent old climatic changes that takes place due to rise in temperature.

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