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

CBSE Class 12 Biology Question Paper All India 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. An electrostatic precipitator in a thermal power plant is not able to generate high voltage of several thousands. Write the ecological implication because of it.

2. Bt-toxins are released as inactive crystals in the bacterial body. What happens to it in the cotton boll worm body that it kills the boll worm ?

3. State two postulates of Oparin and Haldane with reference to origin of life.

4. Name the type of cross that would help to find the genotype of a pea plant bearing violet flowers.

5. A herd of cattle is showing reduced fertility and productivity. Provide one reason and one suggestion to overcome this problem.

SECTION B

6. List four benefits to human life by eliminating the use of CFCs.

                                            OR

Suggest two practices giving one example of each, that help protect rare or threatened species.

7. Give the binomials of two types of yeast and the commercial bioactive products they help to produce.

8. Differentiate between the genetic codes given below :

(a) Unambiguous and Universal

(b) Degenerate and Initiator

9. How many cells are present in the pollen grains at the time of their release from anther ? Name the cells

10. Name the group of cells the HIV enters after getting into the human body. What happens in these cells and what are these cells subsequently referred to as ? Name the next group of cells the HIV attacks from here.

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