CBSE Class 12 Biology Question Paper 2019 Set 07 Solved

CBSE Class 12 Biology Question Paper Solved 2019 Set G. Students can download the last year board exams 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. Why are no variations seen in clones ? State two reasons.

2. Differentiate between a DNA and a RNA nucleotide.

3. What is ‘Saltation’ according to de Vries ?

4. Write the scientific name of the organism Alexander Fleming worked on and discovered the first antibiotic. Was the organism he worked on a fungus or a bacterium ?

OR

Suggest a method to overcome excessive inbreeding depression.

5. Name the pollutant attributed to be the cause of ‘ozone-hole’ over the Antarctica region.

OR

List the greenhouse gases other than carbon dioxide.

SECTION B

6. (a) List any two characteristic features of wheat flowers that make it a good example of wind pollination.

(b) It is observed that plant breeders carrying out wheat hybridisation often take pollen grains from the ‘pollen banks’. Do you agree ?

Give one reason in support of your answer.

7. Differentiate between Turner’s syndrome and Down’s syndrome.

8. Explain the relationship between B-lymphocytes and T-lymphocytes in developing an immune response.

9. Why has the Indian Government set up the organisation named GEAC ? Give any two reasons.

OR

Give a schematic representation of the transformation of a pro-insulin into insulin.

10. What is ‘Ori’ ? State its importance during cloning of a vector.

OR

Explain the importance of ‘selectable marker’, with the help of a suitable example. 

Please click the link below to download pdf file of CBSE Class 12 Biology Question Paper Solved 2019 Set G.