CBSE Class 12 Biology Board Question Paper Solved 2018 Set 3

CBSE Class 12 Biology Board Question Paper Solved 2018 Set 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.

1. How do cytokine barriers provide innate immunity in humans ?

2. Write the dual purpose served by Deoxyribonucleoside triphosphates in polymerisation.

3. Write the names of the following :

(a) A 15 mya primate that was ape-like

(b) A 2 mya primate that lived in East African grasslands.

4. Mention the chemical change that proinsulin undergoes, to be able to act as mature insulin.

5. Name two diseases whose spread can be controlled by the eradication of Aedes mosquitoes.

6. How did a citizen group called Friends of Arcata Marsh, Arcata, California, USA, help to improve water quality of the marshland using Integrated Waste Water Treatment ? Explain in four steps.

7. Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non-leguminous terrestrial crop.

(a) Recommend two microbes that can enrich the soil with nitrogen.

(b) Why do leguminous crops not require such enrichment of the soil ?

8. You have obtained a high yielding variety of tomato. Name and explain the procedure that ensures retention of the desired characteristics repeatedly in large populations of future generations of the tomato crop.

9. (a) Name the source plant of heroin drug. How is it obtained from the plant ? 

(b) Write the effects of heroin on the human body.

Please click the link below to download pdf file of CBSE Class 12 Biology Board Question Paper Solved 2018 Set 3.