CBSE Class 12 Biology Question Paper Foreign with Answers 2017 (3)

CBSE Class 12 Biology Question Paper Foreign with Answers 2017 (3). Students can download the last year question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION A

1. A region of a coding DNA strand has the following nucleotide sequence : – A T G C –

What shall be the nucleotide sequence in (i) sister DNA segment it replicates, and (ii) m-RNA polynucleotide it transcribes ?

2. Very small animals are rarely found in polar regions. Give two reasons.

3. Write the role of histone protein in packaging of DNA in eukaryotes.

4. Name the vegetative propagules in (i) Potato, and (ii) Pistia.

5. List the type of cry genes that provide resistance to corn plants and cotton plants respectively against lepidopterans.

SECTION B

6. Justify the need for signing of Montreal Protocol by the participating nations.

7. State how does ex-situ conservation help in protecting biodiversity.

8. Draw a sectional view of an apple and label the different parts of an ovary in it. Fruits develop from an ovary. Then why is apple referred to as a false fruit ?

9. Explain codominance with the help of one example.

                                           OR

What do the forelimbs of whales, bats and cheetah with respect to evolution signify ? Provide one such example in plants.

10. Name a bioactive molecule, its source organism and the purpose for which it is given to organ transplant patients.

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