CBSE board 12th Last years solved question papers

[Nitin Sharma]

Would you please provide me the CBSE board 12th Last years solved question papers for biology???????

As per your request here I am sharing the CBSE board 12th Last years solved question papers for biology:

6. What is biological nitrogen fixation ? Name two organisms which fix nitrogen
asymbiotically. 2
OR
In which form do plants absorb potassium from the soil ? List any two potassium
deficiency symptoms in plants. 2

7. Who discovered Sertoli cells ? Mention their role in spermatogenesis. 2

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. 2

10. Where do you find complex V in mitochondria ? What is its role ? 2

11. How do sciophytes and heliophytes adapt to different light intensities ? Explain. 2

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.