CBSE Class 12 Biology Question Paper 2006 (2)

CBSE Class 12 Biology Question Paper 2006 (2). 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

Q. 1. What is haemocoel?

Q. 2. What do you call the study of the timing of seasonal activities of plants in relation to change in environmental conditions?

Q. 3. What happens to the glycogen concentration in the liver cells when the concentration of adrenaline in the blood stream increases?

Q. 4. A 30-year-old man with a history of no prior immunization steps on a nail while walking barefoot in his courtyard and bleeds. Which immunizations should be undergo?

SECTION - B

Q. 5. Name the respective mineral nutrient element of plants that

i. is needed in the synthesis of auxinsss

ii. is a constituent of ferredoxin.

iii. forms the core constituent of the ring structure of chlorophyll.

iv. forms the component of nitrogenase and nitrate reductase.

Q. 6. Explain how the hormones glucagon and insulin are antagonistic to each other in their action.

Q. 7. List any four ways how the use of auxins may help in obtaining better yield of fruit crops.

Q. 8. What is quarantine? Why is quarantine essential before introducing a plant species from another country?

Q. 9. Two groups (A and B) of bean plants of similar size and same leaf area were placed in identical conditions. Group A was exposed to light to wavelength of 400-450nm, and Group B to light of wavelength of 500-550 nm. Compare the photosynthetic rate of the two groups giving reason.

Q. 10. Give two differences between rheumatoid arthritis and gouty arthritis.

OR

What is osteoporosis? Name two factors responsible for this condition.

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