A mature embryo sac in a flowering plant may possess 7-cells, bu

Subject

Biology

Class

CBSE Class 12

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

1.

Our government has intentionally imposed strict conditions for M.T.P. in our country. Justify giving a reason.

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2.

State the fate of a pair of autosomes during gamete formation.

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3.

What role does an individual organism play as per Darwin’s theory of natural selection?

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4.

Suggest a method to ensure an anamnestic response in humans.

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5.

What is biopiracy?

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6.

A mature embryo sac in a flowering plant may possess 7-cells, but 8-nuclei. Explain with the help of a diagram only.


A typical angiospermic embryo sac is 8-nucleated and 7-celled.

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7.

Mention the evolutionary significance of the following organisms:

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8.

In an agricultural field, there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:
(a) White rust (b) Leaf and stripe rust
(c) Black rot (d) Jussids
Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus, improve the crop yield.

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9.

How does the application of the fungal genus, Glomus, to the agricultural farm increase the farm output?

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10.

Plenty of algal bloom is observed in a pond in your locality.
(a) Write what has caused this bloom and how does it affect the quality of water.
(b) Suggest a preventive measure.

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