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Biology (Theory) Set 1 2015-2016 ISC (Science) Class 12 Question Paper Solution

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Biology (Theory) [Set 1]
Marks: 70Academic Year: 2015-2016
Date & Time: 18th March 2016, 2:00 pm
Duration: 3h

Part - I (20 Marks)
[20]1
[4]1.a | Give a brief answer for each of the following :
[1]1.a.i

What is the central dogma?

Concept: Transcription - Introduction of Transcription
Chapter: [2.02] Molecular Basis of Inheritance
[1]1.a.ii

Define cryopreservation.

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[1]1.a.iii

What is symbiosis?

Concept: Introduction of Reproduction in Organisms
Chapter: [1.01] Reproduction in Organisms
[1]1.a.iv

Explain the term perianth.

Concept: Introduction of Reproduction in Organisms
Chapter: [1.01] Reproduction in Organisms
[4]1.b
[1]1.b.i

The following question(s)/statement(s) has four suggested answers. Choose the correct option in the following case.

The curve showing the amount of light absorbed at each wavelength is : ____________.

Action spectrum

Absorption spectrum

Quantum yield

Quantum requirement

Concept: Organism and Its Environment - Responses to Abiotic Factors
Chapter: [5.01] Organisms and Populations
[1]1.b.ii

The following question(s)/statement(s) has four suggested answers. Choose the correct option in the following case.

After fertilisation, the integuments of an ovule develop into : __________.

Seed

Seed coat

Fruit

Fruit wall

Concept: Sexual Reproduction - Pre-fertilisation Events - Gametogenesis
Chapter: [1.01] Reproduction in Organisms
[1]1.b.iii

The following question(s)/statement(s) has four suggested answers. Choose the correct option in the following case.

Meselson and Stahl’s experiment proved: _________.

Transduction

Transformation

DNA is the genetic material

Disruptive DNA replication

Concept: Introduction of Molecular Basis of Inheritance
Chapter: [2.02] Molecular Basis of Inheritance
[1]1.b.iv

The following question(s)/statement(s) has four suggested answers. Choose the correct option in the following case.

The act of expelling the full-term foetus from the uterus is termed as __________.

Gestation

Implantation

Parturition

Capacitation

Concept: Parturition and Lactation
Chapter: [1.03] Human Reproduction
[4]1.c
[1]1.c.i

Give the scientific term for the following:

The smallest unit of DNA can mutate.

Concept: Structure of DNA and RNA
Chapter: [2.02] Molecular Basis of Inheritance
[1]1.c.ii

Give the scientific term for the following:

Type of water absorption by roots where metabolic energy is required.

Concept: Energy Flow
Chapter: [5.02] Ecosystem
[1]1.c.iii

Give the scientific term for the following:

Statistical study of the human population.

Concept: Introduction of Organisms and Populations
Chapter: [5.01] Organisms and Populations
[1]1.c.iv

Give the scientific term for the following:

Multiple effects of a gene on the phenotype of an organism.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[4]1.d
[1]1.d.i

Expand the following abbreviation :

rDT

Concept: Structure of DNA and RNA
Chapter: [2.02] Molecular Basis of Inheritance
[1]1.d.ii

Expand the following abbreviation: BAC

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
[1]1.d.iii

Expand the following abbreviation: SSBP

Concept: Single Cell Protein (SCP)
Chapter: [3.02] Strategies for Enhancement in Food Production
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[1]1.d.iv

Expand the following abbreviation: IUCD

Concept: Introduction of Reproductive Health
Chapter: [1.04] Reproductive Health
[4]1.e
[1]1.e.i

Name the scientist who has contributed to the following: Reverse transcription

Concept: Introduction of Molecular Basis of Inheritance
Chapter: [2.02] Molecular Basis of Inheritance
[1]1.e.ii

Name the scientist who has contributed to the following: Photorespiration

Concept: Introduction and Types of Ecosystem
Chapter: [5.02] Ecosystem
[1]1.e.iii

Name the scientist who has contributed to the following: Principle of limiting factors

Concept: Introduction of Organisms and Populations
Chapter: [5.01] Organisms and Populations
[1]1.e.iv

Name the scientist who has contributed to the following :

Photolysis of water

Concept: Introduction and Types of Ecosystem
Chapter: [5.02] Ecosystem
Section - A Part-II (50 Marks)
[50]2 | (Answer any two questions)
[3]2.a

Mention three features of the Neanderthal Man.

Concept: Introduction of Evolution and Origin of Universe and Earth
Chapter: [2.03] Evolution
[1]2.b

Differentiate between connecting links and the missing links.

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[1]2.c

What is adaptive radiation?

Concept: Adaptive Radiation
Chapter: [2.03] Evolution
[5]3
[3]3.a

Give an account of Lederberg’s replica plating experiment to show the genetic basis of evolution.

Concept: Introduction of Molecular Basis of Inheritance
Chapter: [2.02] Molecular Basis of Inheritance
[1]3.b

Define phylogeny.

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[1]3.c

What is the Founder's effect?

Concept: Introduction of Evolution and Origin of Universe and Earth
Chapter: [2.03] Evolution
[5]4
[3]4.a

With reference to the levels of an organisation, differentiate between living organisms and non-living objects.

Concept: Ecological Pyramids
Chapter: [5.02] Ecosystem
[1]4.b

Mention one cause for variation in nature.

Concept: Heredity and Variation
Chapter: [2.01] Principles of Inheritance and Variation
[1]4.c

What is the difference between the teeth of apes and the teeth of man?

Concept: Origin of Life
Chapter: [2.03] Evolution
Section-B
[10]5 | (Answer any two questions)
[4]5.a

Give a graphic representation of the C3 cycle.

Concept: Nutrient Cycling
Chapter: [5.02] Ecosystem
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[4]5.b

Discuss the role of cambium in the secondary growth of dicot stems.

Concept: Introduction of Sexual Reproduction in Flowering Plants
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2]5.c

State two advantages of vegetative propagation.

Concept: Asexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[10]6
[4]6.a

Explain the role of hormones during the menstrual cycle.

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[4]6.b

Give four adaptations shown by flowers pollinated by wind.

Concept: Pre-fertilisation - Structures and Events - Pollination
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2]6.c

Give two differences between heartwood and sapwood.

Concept: Introduction of Reproduction in Organisms
Chapter: [1.01] Reproduction in Organisms
[10]7
[4]7.a

Explain the chemiosmotic hypothesis for ATP synthesis.

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
[4]7.b

Draw a neat labelled diagram of the vertical section of a monocot leaf.

Concept: Introduction of Sexual Reproduction in Flowering Plants
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2]7.c

Mention any two functions of the human placenta.

Concept: Pregnancy and Embryonic Development
Chapter: [1.03] Human Reproduction
[10]8
[4]8.a

Explain the process of sex determination in honey bees.

Concept: Sex Determination in Honey Bees
Chapter: [2.01] Principles of Inheritance and Variation
[4]8.b

Define complete linkage. Give an example of a cross, showing complete linkage.

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [2.01] Principles of Inheritance and Variation
[2]8.c

Write a short note on Multiple Ovulation Embryo Transfer Technology. 

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[10]9
[4]9.a

Give an account of artificial chromosomes in the transfer of genetic material.

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[4]9.b

Mention any four methods involved in the treatment of cancer.

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[2]9.c

What is RNA interference? Give any one application of RNA interference.

Concept: Structure of DNA and RNA
Chapter: [2.02] Molecular Basis of Inheritance
[10]10
[4]10.a

What is Integrated Pest Management?

Concept: Introduction of Microbes in Human Welfare
Chapter: [3.03] Microbes in Human Welfare
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[4]10.b

Explain the structure of a typical antibody molecule.

Concept: Introduction of Human Health and Diseases
Chapter: [3.01] Human Health and Diseases
[2]10.c

Why are bio-fertilizers preferred over chemical fertilizers?

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