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Board Paper of Class 12-Science 2006 Biology (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 1

    What prevents collapsing of our trachea during breathing?

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  • Question 2

    What advantage does the sea anemone get in the sea anemone−hermit crab facultative mutualism? Give an alternative term for this kind of mutualism.

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  • Question 3

    Name the nitrogenous waste excreted in the larval and adult stages of frog respectively.

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  • Question 4

    In a wheat field, some broad-leaved weeds were found by a farmer. Which phytohormone can be used to eradicate them?

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  • Question 5

    Correct the statement given below with respect to brazzein: “Brazzein is a high calorie carbohydrate.”

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  • Question 6

    What is reverse osmosis? Give its one application.

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  • Question 7

    Which two heart sounds are heard through the stethoscope when placed on the chest? When are these sounds produced respectively?

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  • Question 8

    How is polyspermy prevented in humans?

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  • Question 9

    Write the full form of ELISA? Give example of the clinical application of ELISA test.

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  • Question 10

    What is fermentation? Name any two organic compounds produced in this process.

    OR

    What is glycolysis? Name the two monosaccharides which readily enter the glycolytic pathway.

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  • Question 11

    Draw a diagrammatic sketch of the microscopic view of a mammalian sperm and label any four parts in it.

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  • Question 12

    Name the location and function of Meibomian glands in the human eye.

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  • Question 13

    What would happen to the successive trophic levels in the pyramid of energy if the rate of reproduction of phytoplanktons was slowed down? Suggest two factors which could cause such a reduction in phytoplankton reproduction.

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  • Question 14

    What is cryopreservation? Give its one use.

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  • Question 15

    What is meant by total fertility rate? How does it differ from replacement level?

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  • Question 16

    What is agamospermy? How is agamospermy different from parthenogenesis and parthenocarpy?

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  • Question 17

    How can haploid plants be raised in the laboratory? Name the plant first used in India to produce haploid plants.

    Can haploid plants raise their own progeny? Give reason.

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  • Question 18

    What is the law of limiting factors? How would the rate of photosynthesis be affected if the soil water becomes limiting? Explain.

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  • Question 19

    Give information as asked about the following mineral nutrients in plants.

    Iron:

    It is a constituent of __________

    Its one typical deficiency symptom

    Zinc: 

    The group of enzymes it activates

    It is needed for the synthesis of _________

    Phosphorus:

    The form in which it is absorbed from the soil

    Its deficiency effect on seed germination

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  • Question 20

    What is the role of calcium ions, troponin and F-Actin during contraction in striated muscles of humans?

    OR

    Explain giving one example of each, the three types of joints in human skeleton, based on the capacity of movement.

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  • Question 21

    A patient was complaining of frequent urination, excessive thirst, hunger, and tiredness. His fasting blood glucose level was found higher than 130 mg/dl on two occasions.

    Name the disease.

    Give the root cause of this disease.

    Explain why the blood glucose level is higher than 130 mg/dl.

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  • Question 22

    Name and explain any three adaptations of mangroves to the conditions prevailing in the Sunderbans (West Bengal)

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  • Question 23

    What is eutrophication” Explain its consequences on the life of plants and animals living in such waters. Why is oxygen depletion in a eutrophicated water-body faster at night than during the day?

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  • Question 24

    What is a vaccine? Give an example of a vaccine produced by recombinant DNA technology?

    Name the disease against which DTP vaccination develops immunity.

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  • Question 25

    Define senescence. Explain the ‘programmed senescence theory’ of ageing.

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  • Question 26

    Explain the process of Crassulacean acid metabolism. How is it advantageous to plants?

    OR

    Explain the major steps in Krebs cycle. Why is this cycle also called citric acid cycle?

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  • Question 27

     

    What is electrocardiography? What is meant by P-Q interval and S -T interval in electrocardiography? Mention two medical applications of this technique. 

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  • Question 28

    Draw a section of the microscopic structure of human retina and label any six parts in it.

    Name the structure that determines the eye colour in humans. What is the normal function of this structure?

    Name the point of sharpest vision and the point of no vision in human eye.

    OR

    Draw the basic structure of a neural synapse and label the following parts in it Presynaptic cell, Postsnaptic cell, Vesicles, Neurotransmitter, Receptor, Synaptic cleft.

    Give any two differences between chemical synapses and electrical synapses.

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