Subject

Biology

Class

CBSE Class 12

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

Download the PDF Sample Papers Free for off line practice and view the Solutions online.
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 Multiple Choice QuestionsShort Answer Type

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11.

Differentiate between albuminous and non-albuminous seeds, giving one example of each.


The differences between albuminous and non-albuminous seeds are as under:

Albuminous seeds

Non-albuminous seeds

These seeds have endosperm.

These seeds do not have endosperm because it is consumed by the growing embryo.

Examples: wheat and maize

Examples: pea and beans

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12. Explain the process of RNA interference.
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13. List the key tools used in recombinant DNA technology.
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14. Name the two types of immune systems in a human body. Why are cell-mediated and humoral immunities so called?
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15.

Write the scientific names of the causal organisms of elephantiasis and ringworm in humans. Mention the body parts affected by them.

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16. Justify with the help of an example where a deliberate attempt by humans has led to the extinction of a particular species.
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17. Identify A, D, E and F in the diagram of an antibody molecule given below.

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18.

Study the graph given below. Explain how oxygen concentration is affected in the river when sewage is discharged into it.

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19. Explain how a hereditary disease can be corrected. Give an example of first successful attempt made towards correction of such diseases.
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20. Draw a diagram of a male gametophyte of an angiosperm. Label any four parts. Why sporopollenin is considered the most resistant organic material?
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