CBSE Class 12 Biology Question Paper 2007 (3)

CBSE Class 12 Biology Question Paper 2007 (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. Mention the significant role of lymph capillaries (lacteals) in villi.

2. In a wheat field, some broad-leaved weeds were seen by a farmer.Name the synthetic plant hormone you would suggest to the farmer to get rid of them.

3. What is the starting point of a detritus food chain ?

4. Why is cardiac pacemaker a life-saving device ?

5. A container is divided into compartments A and B using a semipermeable membrane.Compartment A is filled with 10 percent sucrose solution and B with 5 percent sucrose solution. Mention the direction in which the water will move between the two compartments. Name the process by which the water moves.

SECTION-B

6. What is biological nitrogen fixation ? Name two organisms which fix nitrogen asymbiotically.

OR

In which form do plants absorb potassium from the soil ? List any two potassium deficiency symptoms in plants.

7. Who discovered Sertoli cells ? Mention their role in spermatogenesis.

8. What is anthropogenic extinction ? How is it different from mass extinction ?

9. Name the animal in which Rh factor was first discovered. Mention the problem expected to occur if an Rh_ mother bears an Rh+ foetus in humans.

10. Where do you find complex V in mitochondria ? What is its role ?

11. How do sciophytes and heliophytes adapt to different light intensities ? Explain.

12. One pea plant is illuminated with green light and another pea plant, similar in all respects (size and leaf area etc.) illuminated with blue light. In which plant will the rate of photosynthesis be higher and in which will it be lower, if all other conditions are identical ? Give reasons.

Please click the link below to download pdf file of CBSE Class 12 Biology Question Paper 2007 (3).