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Biology (Theory) Set 1 2017-2018 ISC (Science) Class 12 Question Paper Solution

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Biology (Theory) [Set 1]
Marks: 70Academic Year: 2017-2018
Date: March 2018

[20]1
[8]1.1 | Answer the following questions briefly and to the point:
[1]1.1.1

Give a significant point of difference between Oestrous and Menstrual cycle.

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[1]1.1.2

Name the causative organism and preventive measures for Typhoid

Concept: Infectious and Non Infectious Disease
Chapter: [3.01] Human Health and Diseases
[1]1.1.3

If the haploid number of chromosomes in a plant species is 20, how many chromosomes will be
present in the cells of the shoot tip?

Concept: Introduction of Sexual Reproduction in Flowering Plants
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[1]1.1.4

Name a plant which flowers every twelve years.

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[1]1.1.5

Name the diagnostic test for AIDS.

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[1]1.1.6

Name the terminal stage of ageing in the life cycle of plants

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[1]1.1.7

Which organisms constitute the last trophic level?

Concept: Ecological Pyramids
Chapter: [5.02] Ecosystem
[1]1.1.8

What is emasculation?

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[4]1.2 | Each of the following questions has four choices. Choose the best option in each case
[1]1.2.1

Length of DNA with 23 base pairs is :

(1) 78.4 Å

(2) 78.2 Å

(3) 78 Å

(4) 74.8 Å

Concept: Structure of DNA and RNA
Chapter: [2.02] Molecular Basis of Inheritance
[1]1.2.2

Opium is obtained from :

(1) Papaver somniferum

(2) Cannabis sativa

(3) Erythroxylum coca

(4) Datura metal

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [3.01] Human Health and Diseases
[1]1.2.3

According to Abiogenesis, life originated from

(1) Non-living matter

(2) Pre-existing life

(3) Oxygen

(4) Extra-terrestrial matter

Concept: Modern Synthetic Theory of Evolution
Chapter: [2.03] Evolution
[1]1.2.4

The largest unit in which gene flow is possible is :

(1) Organism

(2) Population

(3) Species

(4) Genes

Concept: Darwin'S Contribution
Chapter: [2.03] Evolution
[4]1.3
[1]1.3.1

Give one significant contribution of the given scientists:

P. Maheshwari

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]1.3.2

Give one significant contribution of the given scientist

E. Wilson

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
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[1]1.3.3

Give one significant contribution of the given scientists:

M. S. Swaminathan

Concept: Introduction of Strategies for Enhancement in Food Production
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]1.3.4

Give one significant contribution of the given scientists

H. Boyer

Concept: Search for Genetic Material - Introduction of Search for Genetic Material
Chapter: [2.02] Molecular Basis of Inheritance
[2]1.4

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

Concept: Ethical Issues
Chapter: [4.02] Biotechnology and Its Applications

Define Parthenocarpy

Concept: Significance of Seed Dispersal and Fruit Formation
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2]1.5

Give a reason for the Following:

Pollen grains of wind-pollinated flowers are produced in large quantities.

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants

Give a reason for the Following:

Equilibrium of a forest ecosystem can be disturbed by uncontrolled hunting of big predators.

Concept: Extinction
Chapter: [5.03] Biodiversity and Its Conservation
[2]2 | Attempt Any One
[2]2.1

A woman with blood group O married a man with blood group AB shows the possible blood groups of the progeny. List the alleles involved in this inheritance.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[2]2.2

If the mother is a carrier of colour blindness and the father is normal, the possible genotype and
the phenotype of the offspring of the next generation, with the help of a punnet square

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[2]3

Define lifespan. Give the lifespan of an elephant

Concept: Embryo Development Upto Blastocyst Formation
Chapter: [1.03] Human Reproduction
[2]4

Give two characteristic features of Ramapithecus

Concept: Origin and Evolution of Man
Chapter: [2.03] Evolution

Give two characteristic features of Cro-Magnon man

Concept: Origin and Evolution of Man
Chapter: [2.03] Evolution
[2]5 | Attempt Any One
[1]5.1

List any four effects of global warming

Concept: Greenhouse Effect and Climate Change
Chapter: [5.04] Environmental Issues
[1]5.2

State any four measures to control noise pollution

Concept: Noise Pollution and Its Control
Chapter: [5.04] Environmental Issues
[2]6

What do you mean by Biochemical Oxygen Demand (BOD)?

Concept: Water Pollution - Causes of Water Pollution
Chapter: [5.04] Environmental Issues

What is Biochemical Oxygen Demand significance in an aquatic ecosystem?

Concept: Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
[2]7
[1]7.1

Give one significant difference between Humoral immunity and cell-mediated immunity.

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[1]7.2

Give one significant difference between Benign tumour and malignant tumour

Concept: Infectious and Non Infectious Disease
Chapter: [3.01] Human Health and Diseases
[2]8

Give four causes of infertility in males.

Concept: Infertility
Chapter: [1.04] Reproductive Health
[3]9 | Attempt Any One
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[3]9.1

Draw a labelled diagram of L.S. of human testis.

Concept: The Male Reproductive System
Chapter: [1.03] Human Reproduction
[3]9.2

Draw a labeled diagram of a mature embryo sac.

Concept: Embryo Development Upto Blastocyst Formation
Chapter: [1.03] Human Reproduction
[3]10

Explain gene therapy, with reference to the treatment of SCID

Concept: Gene Flow and Genetic Drift
Chapter: [2.03] Evolution
[3]11

Study the table given below. Do not copy the table, but write the answers in the correct order

Scientific Name Commercial Product Use
(a) ____________ Streptokinase (b) ____________
Monascus purpureus (c) ____________ (d) ____________
(e) ____________ Lactic acid (f) ____________
Concept: Introduction of Microbes in Human Welfare
Chapter: [3.03] Microbes in Human Welfare
[3]12

Explain industrial melanism.

Concept: Introduction of Environmental Issues
Chapter: [5.04] Environmental Issues
[3]13

Describe the tissue culture technique in plants

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production
[3]14

Define Spermatogenesis

Concept: The Male Reproductive System
Chapter: [1.03] Human Reproduction

Define Reproductive health

Concept: The Male Reproductive System
Chapter: [1.03] Human Reproduction

Define Amenorrhea

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[3]15 | Attempt Any One
[3]15.1

Define Hotspots

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation

Define Ramsar Sites

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation

What is Red Data Book?

Concept: Red Data Book
Chapter: [5.03] Biodiversity and Its Conservation
[3]15.2

Define Biodiversity

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation

Define Eutrophication

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation

Define PAR(photosynthetically active radiation)

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[5]16 | Attempt Any One
[5]16.1

Describe post-transcriptional processing of RNA in eukaryotes

Concept: Gene Flow and Genetic Drift
Chapter: [2.03] Evolution
[5]16.2

Describe Avery, McLeod and McCarty’s experiment. State its significance.

Concept: Search for Genetic Material - Introduction of Search for Genetic Material
Chapter: [2.02] Molecular Basis of Inheritance
[5]17 | Attempt Any One
[5]17.1

Write a short note on Chipko Movement.

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[5]17.2

Write a short note on Joint forest management.

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[5]18 | Attempt Any One
[5]18.1

What does PCR stand for? Describe the different steps of PCR

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
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[5]18.2

Give an account of the Blue-White Method of selection of recombinants

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
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