CBSE Class XII 2015 Preparation Tips for Biology

Reproduction In Organisms

Sexual Reproduction In Flowering Plants

Human Reproduction

Reproductive Health

Principles Of Inheritance And Variation

Molecular Basis Of Inheritance

Human Health And Disease

Strategies For Enhancement In Food Production

Microbes In Human Welfare

?Biotechnology: Principles And Processes

Biotechnology And Its Applications

Organisms And Populations

Ecosystems

Biodiversity And Conservation

 Evolution

Form of Questions

Marks for each Question

No. of Questions

Total Marks

Long Answer Type (LA)

5

3

15

Short Answer (SA I) 3 09 27

3

9

27

Short Answer (SA II) 2 10 20

2

10

20

Very Short Answer (VSA)

1

8

8

TOTAL

30

70

Some Important Questions for Class 12^th Biology

• Define tissue culture and micropropagation. Mention their significance for enhancement of food production.

• What is active and passive immunity? Give examples of vaccines that provide active and passive immunity. Mention which one is long lasting and why?

• Tubectomy and Vasectomy cannot be considered as methods of contraception. Give reason.

• How techniques like GIFT, ZIFT, AI are different from each other? Describe each one of them.

• Under which conditions will a couple need surrogate mother’s help?

• Describe in detail the events taking place during oogenesis.

• Define central dogma. How retroviruses are an exception to the unidirectional information flow?

• What are pleiotropic genes? Give example.

• Describe the inheritance pattern of human skin colour.

• Differentiate between co dominance and incomplete dominance.

• Describe in detail the ecosystem services. Discuss the role played by biodiversity in maintenance of ecosystem services.

• Explain the specificity of energy flow in the ecosystem with reference to ecological pyramids.

• What is standing crop?