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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

    Or,

    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

    Urea

    d. Agents that cause mutations are called:

    i) mutagens ii) mutants iii) chromosomes iv)

    genes

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

    a) Metagenesis ii) Metamorphosis iii) Haploidy iv)

    Diploidy

    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

    Or

     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 ;

     Adrenal

    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 ;

     Degradation

    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

    Or

     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 :35

     Time : 3hrs

    Attempt all questions. Figures in the margin indicate full marks. 1. Mark ( ) the correct choice. 5x1=5

    a. Genetic make up of an individual is called ……….

    ; Phenotype ; Genotype ; Recessive

     ; None

    b. Alternation of generation occurs in ………

    ; Hydra ; Obelia ; Sea-

    anemone ; Jelly-fish

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

    ; Volant adaptation ; Arboreal adaptation ; Fossorial adaptation ; Cursorial

    adaptation

    d. Alcoholic fermentation is catalysed by ……..

    ; Catalase ; Polymerase ; Lipase

     ; Zymase

    e. The mutation theory was proposed by ……

    ; Devries ; Charles Darwin ; Lamark

     ; A.R. Wallace

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

    a. Justify pancreas as exocrine and endocrine gland.

    b. List any three renewable natural resources.

    c. Name any three plant hormones.

    d. Mention any three important xerophytic characters of plants.

    e. What is carrying capacity? Give one example.

    f. What is dihybrid cross?

    3. Attempt any five of the following questions: 5x2=10

    a. Discuss any two possible consequences caused by forest exploitation.

    b. Mention the function of male sex hormone.

    c. What is plant growth inhibitor? Why is it necessary in plants?

    d. What is endangered species? Give two examples.

    e. Why is the phenotypic ration 3 : 6 : 3 : 1 : 2 : 1 obtained?

    f. How are fossils formed?

    4. Differentiate between the followings 5x3=15

    a. Euploidy and anenploidy

    b. Dominance and recessive

    c. Metamorphosis and metagenesis

    d. Haploidic life cycle and diploidic life cycle

    e. Autogamy and allogamy

    5. Explain the role of biological factors on agriculture. 10 6. Discuss the Law of Independent Assortment. 10 7. What is organic evolution? Give any two evidences to support organic evolution. 10

    Or

     Throw light on the management of natural resources.

    ***

    Higher Secondary Education Board

    Examination 2052 (1995)

    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. Cleavage in frog is:

    i) Holoplastic and unequal ii) Holoblastic and equal

    iii)Centrolecithal iv) None of them

    b. An organism having similar genes is called:

    i) Genotype ii) Dihybrid iii) Homozygous iv) Linkage

    c. The theory of mutation was given by:

    i) Darwin ii) Cuvier iii) de vries iv)

    Lamarck

    d. Pancreas is:

    i) Exocrine ii) Endocrine iii) Gonads

     iv) None of them

    e. A delicate and dynamic balance exist between the biotic and abiotic factors is called:

    i)Consumers ii) Producer iii) Ecology iv)

    Ecosystem

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

    a. Define metamorphosis. List the different process of metamorphosis.

    b. What is the basis of mendelian genetics? Explain the law of segregation of characters.

    c. State Hardy-Weinberg equilibrium.

    d. List the characters of identification of genetic disorder.

    e. Name any three biological factors that affects agriculture.

    f. List the process of segmentation of the egg of frog. 3. Attempt any five of the following: 5x2=10

    a. How does endosperm in angiosperms become triploid?

    b. How does natural selection operate according to Darwin's theory of evolution?

    c. What is endocrine gland? Give the list of major endocrine glands.

    d. Mention any two important characters of artificial selection.

    e. Name any four growth hormones find in plant.

    f. List any four insecticidal effects on an environment. 4. Differentiate between following terms: 5x3=15

    a. Heterozygous and homozygous

    b. Phenotype and genotype

    c. Biotic factor and abiotic factors

    d. Sporophyte and gametophyte

    e. Natural selection and artificial selection.

    5. Discuss on different aspects of conservation of water. 10 6. Describe the process of human evolution. 10

    7. Describe briefly the effects of fertilizer in an environment. 10

    Or

     Discuss briefly about the alcoholic fermentation.

    ***

    Higher Secondary Education Board

    Examination 2051 (1994)

    Grade XII

    Biology Theory

     Full Marks : 100

     Pass Marks :35

     Time : 3hrs

    Attempt all questions. Marks for each question are indicated against it. 1. Mark the correct choice of the following questions:. 5x1=5

    a. The process by which tadpole larva is converted into adult frog is called:

    ; Moulting ; Maturation ;

     Metamorphosis ; Morphogenesis

    b. Law of segregation relates to:

    ; Palaentology ; Embryology ; Genetics

     ; Evolution

    a. The pairing of homologous chromosomes takes place in

    ; Leptotene ; Zygotene ; Pachytene

     ; Diplotene

    b. The presence of one or more complete sets of chromosomes are called:

    ; Linkage ; Phenotype ; Polyploidy

     ; Genotype

    e. The diploid cell resulting from fusion of male and female gametes known as:

    ; Zoospore ; Zygospore ; Zygote

     ; Spore

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

    a. What is metagenesis? Give its significance.

    b. Discuss adaptational features of aerial life.

    c. Mention the names of the theories of evolution and explain which one is most pertinent to

    explain the evolution.

    d. Name any four types of plant growth hormones and its function.

    e. Draw a well labelled carbon cycle.

    f. Mention any four biological factors that affect different types of agriculture.

    3. Define the following terms (any five) 5x2=10

    a. Genotype

    b. Genetic engineering

    c. Biotic factors

    d. Biotechnology

    e. Colonization

    f. Conservation of nature

    4. Distinguish between (any five) 5x3=15

    a. Fraternal and identical twins\

    b. Haplodic and diploidic

    c. Homologous and vestigial organs

    d. Intraspecific and interspecific relationship

    e. Abiotic and biotic components

    f. Dominant and recessive alleles

    5. What are natural resources? Discuss their importance in the life of human beings. 10

    6. Write an account of pituitary and pancreatic endocrine glands in mammals. State their functions. 10

    7. Briefly discuss biotechnology in agriculture 10

    Or

     Write what you know about human evolution.

    ***

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