Higher Secondary Education Board

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Higher Secondary Education Board

    Higher Secondary Education Board

    Examination 2056 (1999)

    Grade XII

    Biology Theory

     Full Marks : 100

     Pass Marks :35

     Time : 3hrs

    Attempt all questions. Figures in the margin indicate full marks. 1. Select the correct answer by a tick () mark. 5x1=5

    a) Nitrogen is the constituent of

    i) Carbohydrate ii) Lipid iii) Protein iv) Organic acid

    b) Largest cranial capacity is found in

    i) Java man ii) Neanderthal man iii) Cro-magnon man iv) Peking man

    c) Rooting hormones are

    i) Auxins ii) Gibberllins iii) Kinetins iv) Ethylene

    d) The probability of appearance of tall characters on pea plants in Fgeneration of a 2

    Mendelian Experiment is

    i) 100 % ii) 50% iii) 75% iv) 25%

    e) Wild life conservation means

    i. To conserve wild plants only

    ii. To conserve wild animals only

    iii. To conserve rare animals only

    iv. To conserve wild plants and animals.

    2. Write short notes on any four of the followings 4x4=16

    a) Haplodiploidic Life-cycle. b) Monoclonal antibody

    c) Mongolian idiocy d) Metagenesis

    e) Productivity f) Genetic engineering

    3. Explain any four of the followings 4x4=16

    a) Artificial selection has a wide practical application.

    b) Wings are the most important organs of flying animals

    c) Non-renewable resources cannot support the human need for ever.

    d) Man is the product of evolution

    e) Chemical fertilizers are the sources of water pollution.

    f) Thyroxine hormone triggers the rate of metamorphosis. 4. Differentiate between any four of the followings 4x2=8

    a) Herbicides and insecticides

    b) Fore limb of bat and fin of a fish

    c) Steady-state theory and Special Creation Theory

    d) Phenotype and genotype

    e) Allopatric and sympatric speciations.

    f) Auxins and Gibberllins.

    5. What are natural resources ? Discuss the multi-use of water. 2+8=10 6. State and explain the Hardy-Weinberg equilibrium, and calculate the frequency of carrier

    genotype in a population. 2+8=10

    7. Describe the ecological principles applied in agricultural ecosystems. 10


    Describe the roles of temperature and edaphic factors in agriculture.


    Higher Secondary Education Board

    Examination 2055 (1998)

    Grade XII

    Biology Theory

     Full Marks : 100

     Pass Marks :35

     Time : 3hrs

    Attempt all questions. Figures in the margin indicate full marks. 1. Put tick mark () on the correct answer. 5x1=5

    a. Which of the following theories contains an idea that life comes only from pre-existing life?

    i) Theory of special creation ii) Theory of spontaneous generation

    iii)Theory of organic evolution iv) Mendel's Law of Inheritance

    b. Falling of leaves from plants is due to:

    i) excess of auxins in the leav ii) High concentration of ABA in the leaf

    iii)due to cytokinins iv) due to Gibberellin

    c. Bio-fertilizers give a better yield when added along with:

    i) Po - fertilizers ii) Ca - fertilizers iii) N - fertilizers iv) 42


    d. Agents that cause mutations are called:

    i) mutagens ii) mutants iii) chromosomes iv)


    e. Change in shape and size of the individuals during growth is called:

    a) Metagenesis ii) Metamorphosis iii) Haploidy iv)


    2. Discuss any four of the following: 4x4=16

    a) Structure of the Thyroid gland

    b) The advantages of out-breeding

    c) Line-diagram showing hominid evolution

    d) How Rhizobium bacteria increase soil fertility

    e) Effect on wildlife due to forest exploitation

    f) The "alternation of generation" in the lifecycle of a fern plant 3. Explain any four of the followings each one in a short paragraph 4x4=16

    a) Pituitary gland is referred to as "Master Gland". Why?

    b) Glacial water is one of the best natural resources of Nepal. How?

    c) Productivity of a farmland depends upon the quality of soil, water and temperature. How?

    d) Continuous variation is the raw material for organic evolution. How?

    e) Pneumatic bones is one of the importance characters of the volant animals. How?

    f) Metamorphosis is entirely a hormonal action. How?

    4. Differentiate between any four of the followings pair of words 4x2=8

    a) Haploidic and Diploidic life-cycles

    b) Dwarfism and giantism

    c) Dominant and recessive characters

    d) Auxins and cytokinins

    e) Herbicides and insecticides

    f) Inbreeding and outbreeding.

    5. Explain the behaviour of chromosomes in meiotic cell division. 10 6. Discuss the basic concept of genetic engineering. Explain its practical applications. 5+5=10


     Define the term environment. Describe the important biological factors affecting agriculture.

    7. What are natural resources? Give a list of natural resources of Nepal and their uses. 2+8=10


    Higher Secondary Education Board

    Examination 2054 (1997)

    Grade XII

    Biology Theory

     Full Marks : 100

     Pass Marks :35

     Time : 3hrs

Attempt all questions. Figures in the margin indicate full marks.

    1. Mark ( ) the correct choice. 5x1=5

    a. Grow the inhibiting hormone in plant is:

    ; Abrasic acid ; Auxin ; Cytokinin

     ; Ethane

    b. Series of changes from larva to adult is called:

    ; Metagenesis ; Sparogenesis ; Parthenogenesis ;


    c. Both exocrine and endocrine recreation is found in the gland:

    ; Parathyroid ; Thymus ; Pancreas

     ; Adrenal

    d. Sustainable use of natural resources is called:

    ; Conservation ; Deforestation ; Afforestation ;


    e. Fusion of two identical gametes is called:

    ; Anisogamy ; Oogamy ; Isogamy

     ; Polygamy

    2. Attempt any five of the following: 5x3=15

    a. What is colonization?

    b. Mention the function of pituitaries

    c. What is a species? Give example.

    d. What is metagenesis.

    e. What is double fertilization? Give example.

    f. Name three biological factors affecting agriculture 3. Attempt any five of the following questions: 5x2=10

    a. Prove 9 : 3 : 3 : 1 phenotypic ratio of dihybrid cross

    b. What is green manuring? Give example.

    c. What is the cranial capacity for Java man?

    d. What is hologamy?

    e. Define mutaion theory.

    f. What is conservation of natural resources? 4. Differentiate between the followings 5x3=15

    a. Parasites and Vector.

    b. Insecticides and Hervbicides

    c. Binary fission and Multiple fission

    d. Thyroid gland and Thymus gland

    e. Genetic counseling and genetic screening 5. Discuss on Hardy Weinberg equilibrium. 10

    6. What is management of natural resources? Explain how ecological principles can be applied in

    agriculture. 10

    7. Discuss on the evolution of man. 10


     Write an essay on conservation of Wildlife, Forest and, Soil resources.


    Higher Secondary Education Board

    Examination 2053 (1996)

    Grade XII

    Biology Theory

     Full Marks : 100

     Pass Marks