Subject

Biology

Class

CBSE Class 12

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

1.

An anther with malfunctioning tapetum often fails to produce viable male gametophytes. Give any one reason.

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2.

Why sharing of injection a needle between two individuals is not recommended?

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3.

Name the enzyme and state its property that is responsible for continuous and discontinuous replication of the two strands of a DNA molecule.

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4.

Identify the examples of convergent evolution from the following:

(i) Flippers of penguins and dolphins

(ii) Eyes of octopus and mammals

(iii) Vertebrate brains
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5.

Write the importance of MOET.

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6.

Why is the enzyme cellulase needed for isolating genetic material from plant cells and not from the animal cells?

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7.

Name the type of biodiversity represented by the following:

(a) 50,000 different strains of rice in India.

(b) Estuaries and alpine meadows in India.

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8.

Write the equation that helps in deriving the net primary productivity of an ecosystem.


GPP – R = NPP (where GPP = Gross Primary Productivity, R = Respiratory losses and NPP = Net Primary Productivity)

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9.

Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.

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10.

When and where do chorionic villi appear in humans? State their function.

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