Subject

Biology

Class

CBSE Class 12

Pre Boards

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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


(a) Passive Immunization : - When ready made antibodies are introduced into the body, it is called as passive immunization. It provides quick immune response in body.
(b) Anti Histamines : - These are the chemicals which are given against allergic reactions.
(c) Colostrum : - It is the yellow fluid produced during the initial days of lactation. It is rich in antibodies and is necessary to develop resistance in a new born baby.
(d) Cytokinin-Barrier : - is Interferon. These are the glycoproteins which protect non-infected cells from further viral infection.

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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 .

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