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Question Paper Solutions for Biology (Theory) Set A 2017-2018 ISC (Commerce) Class 12

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Marks: 70
[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.

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

Name the causative organism and preventive measures for Typhoid

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

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

Name a plant which flowers every twelve years.

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

Name the diagnostic test for AIDS.

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

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

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

Which organisms constitute the last trophic level?

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

What is emasculation?

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Plant Breeding
[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

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

Opium is obtained from :

(1) Papaver somniferum

(2) Cannabis sativa

(3) Erythroxylum coca

(4) Datura metal

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

According to Abiogenesis, life originated from

(1) Non-living matter

(2) Pre-existing life

(3) Oxygen

(4) Extra-terrestrial matter

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

The largest unit in which gene flow is possible is :

(1) Organism

(2) Population

(3) Species

(4) Genes

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

Give one significant contribution of the given scientists:

P. Maheshwari

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

Give one significant contribution of the given scientist

E. Wilson

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

Give one significant contribution of the given scientists:

M. S. Swaminathan

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

Give one significant contribution of the given scientists

H. Boyer

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

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

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

Define Parthenocarpy

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

Give a reason for the Following:

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

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

Give a reason for the Following:

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

Chapter: [5.03] Biodiversity and Its Conservation
Concept: Extinction
[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.

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

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

Define lifespan. Give the lifespan of an elephant

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

Give two characteristic features of Ramapithecus

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

Give two characteristic features of Cro-Magnon man

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

List any four effects of global warming

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

State any four measures to control noise pollution

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

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

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

What is Biochemical Oxygen Demand significance in an aquatic ecosystem?

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

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

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

Give one significant difference between Benign tumour and malignant tumour

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

Give four causes of infertility in males.

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

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

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

Draw a labeled diagram of a mature embryo sac.

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

Explain gene therapy, with reference to the treatment of SCID

Chapter: [2.03] Evolution
Concept: Gene Flow and Genetic Drift
[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) ____________
Chapter: [3.03] Microbes in Human Welfare
Concept: Introduction of Microbes in Human Welfare
[3]12

Explain industrial melanism.

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

Describe the tissue culture technique in plants

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

Define Spermatogenesis

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

Define Reproductive health

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

Define Amenorrhea

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

Define Hotspots

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

Define Ramsar Sites

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

What is Red Data Book?

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

Define Biodiversity

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

Define Eutrophication

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

Define PAR(photosynthetically active radiation)

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

Describe post-transcriptional processing of RNA in eukaryotes

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

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

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

Write a short note on Chipko Movement.

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

Write a short note on Joint forest management.

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

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

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

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

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

CISCE previous year question papers Class 12 Biology (Theory) with solutions 2017 - 2018

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