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Board Paper of Class 12-Science 2006 Biology All India(SET 1) - Solutions

General Instructions:
 (i) All questions are compulsory.
(ii) This question paper consists of four sections A, B, C and D.
Section A contains 5 questions of one mark each.
Section B is of 10 questions of two marks each.
Section C is of 10 questions of three marks each and
 Section D is of 3 questions of five marks each.
(iii) There is no overall choice. However, an internal choice has been provided.
(iv) Wherever necessary, the diagrams drawn should be neat and properly labelled.
  • Question 2

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

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  • Question 3

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

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  • Question 4

    Name the type of granulocytes that play an important role in detoxification.

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  • Question 5

    A 30-year-old man with a history of no prior immunisation steps on a nail while walking barefoot in his courtyard and bleeds. Which immunisations should he undergo?

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  • Question 6

    Name the respective mineral nutrient element of plants that is

    (i) needed in the synthesis of auxins

    (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

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  • Question 7

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

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  • Question 8

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

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  • Question 9

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

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  • Question 10

    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 400-450 nm, and Group B to light of wavelength of 500-550 nm. Compare the photosynthetic rate of the two groups giving reason.

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  • Question 11

    Give two differences between rheumatoid arthritis and gouty arthritis.

    OR

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

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  • Question 12

    Explain the relationship between biotic potential and environmental resistance.

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  • Question 13

    What is eutrophication? Explain its consequences on the life of plants and animals in such water bodies.

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  • Question 14

    Why are stimulants and hallucinogens categorized as psychotropic drugs? Give one example each of the two types mentioned.

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  • Question 15

    Draw a labelled diagram of a part of the transverse section through seminiferous tubule of human testis showing the various stages of spermatogenesis.

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  • Question 16

    A section of root nodule of chickpea plant appears pink. What is this colour due to?

    What type of condition does this pigment create in the nodules?

    Explain the process of biological nitrogen fixation in the root nodules.

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  • Question 17

    How does oxidative phosphorylation differ from photophosphorylation? Explain.

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  • Question 18

    Does the location of juxtaglomerular apparatus in human kidney explain its function?

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  • Question 19

    Name the type of pollination taking place in coconut plant. List five characteristics of the flowers of coconut plant favouring this type of pollination.

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  • Question 20

    List any three major categories of cancer. Explain briefly each category giving one example.

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  • Question 21

    A 5-year-old child has complained of pain and swollen joints in his legs for the past one year. On physical examination, the doctor found bleeding gums, anaemia and emaciation.

    Name the deficient vitamin and the corresponding deficiency disease the child is suffering from.

    List any four functions of this vitamin.

    OR

    Why do pregnant women need to have higher levels of folic acid, iron and calcium in their diet?

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  • Question 22

    A person has been diagnosed to be HIV positive. Name the test which the person underwent. Write the full name of the pathogen involved and describe its structure.

    Which particular cells of this person are likely to get destroyed?

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  • Question 23

    What are tropical rain forests? Name any two dominant plant species of such forests in India. Why is soil in tropical deciduous forests richer in nutrients than in tropical rain forests?

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  • Question 24

    What is senescence? How do free radicals make senescence faster?

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  • Question 25

    Describe the special adaptations of xerophytes with respect to root system, stem and leaves.

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  • Question 26

    Name the phenomenon by which the water rises in the xylem vessels in small sized plants. Explain the cohesion theory of ascent of water in tall tree.

    OR

    Explain the mechanism of photorespiration. Name the cell organelles involved in the process.

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  • Question 27

    What is somatic hybridisation? Explain the steps involved in the production of a somatic hybrid.

    OR

    What are biopesticides? Give any two examples of their application. What is mycorrhiza? How does it act as a biofertiliser?

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  • Question 28

    List and explain the three ways in which carbon dioxide is transported by blood in the human body. Support the answer with a suitable diagram.

    OR

    Describe step by step what happens in the different phases of cardiac cycle in humans.

    Name the two heart sounds and mention when they are respectively produced in the cardiac cycle.

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