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Biology 2016-2017 HSC Science (General) 12th Board Exam Question Paper Solution

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Biology
2016-2017 March
Marks: 70

[7]1 | Select and write the most appropriate answer from the given alternatives (along with its alphabets) for each sub-question ·:
[1]1.1

The genotype of human blood group B is

(a)  IAi

(b)  IBi

(c) IAIA

(d) ii

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [1.01] Genetic Basis of Inheritance
[1]1.2

Breakdown of detritus into smaller particles is called

(a) fragmentation
(b) leaching 
(c) catabolism
(d) humification

Concept: Producing Restriction Fragments
Chapter: [2.01] Biotechnology - Process and Application
[1]1.3

In Brassica (rapeseed, mustard)........................ varietys is resistant to Aphids.

(a) Pusa A-4
(b) Pusa Gaurav
(c) Pusa Sawni
(d) . Pusa Shubra

Concept: Plant Breeding
Chapter: [3.01] Enhancement in Food Production
[1]1.4

The antibiotic chloromycetin is obtained from .............
(a) Sclerotiana libertine
(b) Aspergillus niger
(c) Streptomyces griseus
(d) Streptomyces venezuelae


Concept: Microbes in Household Products
Chapter: [3.02] Microbes in Human Welfare
[1]1.5

The ________enzyme is used to cut DNA at specific point

(a) DNA polymerase
(b) Alkaline phosphatase
(c) restriction endonuclease
(d) DNA ligase

Concept: Preparing and Cloning a DNA Library
Chapter: [2.01] Biotechnology - Process and Application
[1]1.6

R. Q. for proteins is about .......................

(a) 0.7

(b) 0.8

(c) 0.9

(d) 1.0

Concept: Single Cell Protein (SCP)
Chapter: [3.01] Enhancement in Food Production
[1]1.7

Ozone depletion is occuring widely in the stratosphere, it leads to ozone hole caused mainly due to ............

(a) ethylene
(b) methane
(c) CFCs
(d) CO2

Concept: Ozone - Ozone Depletion in the Stratosphere
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[12]2
[6]2.1 | Answer each question in 'one' sentence only
[1]2.1.1

Give an example of the source of thermostable enzyme DNA polymerase. 

Concept: Structure of DNA and RNA
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[1]2.1.2

Give an example of the non-edible or poisonous mushroom, studied by you .

Concept: Microbes in Household Products
Chapter: [3.02] Microbes in Human Welfare
[1]2.1.3

Name the secondary metabolites in catharanthus roseus.

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [5.01] Reproduction in Plants
[1]2.1.4

What is ecological succession?

Concept: Ecological Succession
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[1]2.1.5

Name the organism and enzyme which bring about alcoholic fermentation of sucrose .

Concept: Microbes in Household Products
Chapter: [3.02] Microbes in Human Welfare
[1]2.1.6

Enlist any 'two' floral adaptations in salvia.

Concept: Adaptive Radiation
Chapter: [7.01] Origin and the Evolution of Life
[2]2.2

Explain the carbon cycle with the help of a simplified model.

Concept: Nutrient Cycling
Chapter: [6.01] Organisms and Environment 1 - Habitat and Niche
[4]2.3 | Attempt any TWO of the following
[2]2.3.1

What is test cross?

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [1.01] Genetic Basis of Inheritance

Explain significance of a test cross.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [1.01] Genetic Basis of Inheritance
[2]2.3.2

Explain 'Wobble hypothesis' with the help of a suitable diagram.

Concept: Preparing and Cloning a DNA Library
Chapter: [2.01] Biotechnology - Process and Application
[2]2.3.3

What is a 'biopatent'? Explain it with a suitable example.

Concept: Ethical Issues
Chapter: [2.01] Biotechnology - Process and Application
[2]2.3.4

Name the parts W, X, Y and Z from the following figure:

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [5.01] Reproduction in Plants
[9]3
[6]3.1 | Attempt any Two of the following
[3]3.1.1

Explain replication of bacteriophage with the help of a suitable diagram.

Concept: Replication - The Experimental Proof
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[3]3.1.2

What are 'biofertilizers'? Explain them with suitable examples. 

Concept: Biotechnological Applications in Agriculture
Chapter: [2.01] Biotechnology - Process and Application
[3]3.1.3

Differentiate between anemophily and entomophily.

Concept: Modes of Reproduction
Chapter: [5.01] Reproduction in Plants
[3]3.2

Sketch and label V. S. of mature anatropous ovule.

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [5.01] Reproduction in Plants
[7]4 | Attempt any one of the following
[7]4.1

What is 'photophosphorylation'?

Concept: Electron Transport - Cyclic and Non-cyclic Photo-phosphorylation
Chapter: [4.01] Photosynthesis

Describe non-cyclic photophosphorylation with schematic representation. Give its significance.

Concept: Electron Transport - Cyclic and Non-cyclic Photo-phosphorylation
Chapter: [4.01] Photosynthesis
[7]4.2

What is 'RNA'?

Concept: General Structure, Types and Functions of RNA
Chapter: [1.02] Gene - Its Nature, Expression and Regulation

Explain different types of non-genetic RNA with diagrams and functions.

Concept: General Structure, Types and Functions of RNA
Chapter: [1.02] Gene - Its Nature, Expression and Regulation
[7]5 | Select and write the m.ost appropriate answer from the given alternatives (along with its alphabets) for each sub-question :
[1]5.1

Which. of the following has normal vision?

(a) Xc Xc
(b) Xc Y
(c) XC Xc
(d) Xc Yc

Concept: Sensory Reception and Processing - Eye - Parts of an Eye
Chapter: [10.03] Control and Co-ordination
[1]5.2

In DNA fingerprinting technique, radioactive DNA probe is obtained from______ of female banded krait snake.

(a) X chromosome
(b) Y chromoson1e
(c) X and Y chromosomes
(d) autosome

Concept: DNA Fingerprinting
Chapter: [8.01] Genetic Engineering and Genomics
[1]5.3

Abortion in the first trimester of pregnancy may occur due to lack of___________

(a) aldosterone
(b) testosterone
(c) oestrogen
(d) progesterone

Concept: Parturition and Lactation
Chapter: [11.01] Human Reproduction
[1]5.4

________contribute about 60% of the total volume of the semen.

(a) Prostate glands
(b) Cowper's glar1ds
(c) Seminal vesicles
(d) Bartholin's glands

Concept: Microscopic Anatomy of Testis
Chapter: [11.01] Human Reproduction
[1]5.5

Lowering of blood pressure is related with the production of_____

(a) ADH
(b) ANF
(c) GH
(d) LH

Concept: Heart Beat and Pulse
Chapter: [10.01] Circulation
[1]5.6

Humtilin is used to treat_____

(a) Diabetes mellitus
(b) Diabetes insipidus
(c) I-Iepatitis
(d) Nephritis

Concept: Common Diseases in Humans
Chapter: [9.01] Human Health and Diseases
[1]5.7

The modification of original genetic make-up is focussed by_________

(a) PCR
(b) DNA fingerprinting
(c) Electrophoresis
(d) Gene therapy

Concept: Biotechnological Applications in Medicine
Chapter: [8.01] Genetic Engineering and Genomics
[13]6
[6]6.1 | Answer the .following questions only in 'one' sentence each
[1]6.1.1

Which material is used for isolation of DNA in fingerprinting technique?

Concept: DNA Fingerprinting
Chapter: [8.01] Genetic Engineering and Genomics
[1]6.1.2

Give significance of podocyte

Concept: Human Excretory System
Chapter: [10.02] Excretion and Osmoregulation
[1]6.1.3

Define the following term and give one example for each:

Commensalism

Concept: Population - Population Interactions
Chapter: [12.01] Organisms and Environment 2
[1]6.1.4

Name the functions - Acrosome

Concept: Gametogenesis
Chapter: [11.01] Human Reproduction
[1]6.1.5

Distinguish between X andY chromosomes. (Mention any 'two' points.) 

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [7.02] Chromosomal Basis of Inheritance
[1]6.1.6

Give any 'two' examples of endangered species

Concept: Endangered Organisms
Chapter: [12.01] Organisms and Environment 2
[2]6.2

Sketch and Label the 'Structure of HIV'.

Concept: Common Diseases in Humans
Chapter: [9.01] Human Health and Diseases
[4]6.3 | Attempt any two of the following
[2]6.3.1

Write a note on erythrocytes.

Concept: Concept of Immunity
Chapter: [9.01] Human Health and Diseases
[2]6.3.2

What are the uses of vaccine?

Concept: Concept of Immunity
Chapter: [9.01] Human Health and Diseases
[2]6.3.3

Describe the process of budding in hydra.

Concept: Gametogenesis
Chapter: [11.01] Human Reproduction
[2]6.3.4

Name the species used in sericulture. Name the stages in the life cycle of a silk moth in cyclic form. 

Concept: Sex Determination in Honey Bees
Chapter: [7.02] Chromosomal Basis of Inheritance
[9]7
[6]7.1 | Attempt any TWO of the following
[3]7.1.1

Explain ABO  blood group system in human being with a suitable chart.

Concept: Blood - Blood Groups
Chapter: [10.01] Circulation
[3]7.1.2

Describe diagrammatic representation of age structure showing declining population.

Concept: Population and Ecological Adaptations
Chapter: [12.01] Organisms and Environment 2
[3]7.1.3

With the help of a neat and labelled diagram, describe reflex arc.

Concept: Reflex Action and Reflex Arc
Chapter: [10.03] Control and Co-ordination
[3]7.2

Describe the human male reproductive system.

Concept: The Male Reproductive System
Chapter: [11.01] Human Reproduction
[7]8 | Attempt any one of the following
[7]8.1

Define Endocrine gland

Concept: Endocrine Glands and Hormones
Chapter: [10.03] Control and Co-ordination

Describe the T. S. of thyroid gland

Concept: Endocrine Glands and Hormones
Chapter: [10.03] Control and Co-ordination

add a note on deficiency of thyroxine.

Concept: Endocrine Glands and Hormones
Chapter: [10.03] Control and Co-ordination
[7]8.2

Define organic evolution.

Concept: Origin of Life
Chapter: [7.01] Origin and the Evolution of Life

Give the principles of Darwin's theory of natural selection.

Concept: Darwin'S Contribution
Chapter: [7.01] Origin and the Evolution of Life

Objection to Darwin's theory of natural selection

Concept: Darwin'S Contribution
Chapter: [7.01] Origin and the Evolution of Life

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