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Question Paper Solutions - Biology (Theory) 2014 - 2015 ISC (Arts) Class 12

SubjectBiology (Theory)
Year2014 - 2015 (March)

Answer all questions in Part I and six questions in Part II choosing two questions from each of the three sections A(Q2-Q4), B(Q5-Q7) . and C(Q-8-Q10)


Marks: 70
[20]1
[4]1.1 | Give a brief answer for each of the following:
[1]1.1.1

What is heterosis?

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Plant Breeding
[1]1.1.2

Why is non-cyclic photo phosphorylation considered as a non-cyclic pathway?

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Introduction of Sexual Reproduction in Flowering Plants
[1]1.1.3

Define test cross.

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Inheritance of Two Genes - Linkage and Crossing Over
[1]1.1.4

What are introns?

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Transcription - Introduction of Transcription
[4]1.2 | Each of the following question(s)/statement(s) has four suggested answers. Choose the correct option in each case.
[1]1.2.1

Triple Fusion involves:
(i) Fusion of one male, gamete with female gamete
(ii) Fusion of tube nucleus with generative nvcleus
(iii) Fusion of two polar nuclei.
(iv) Fusion of second male gamete with two polar nuclei

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Double Fertilisation
[1]1.2.2

An EEG represents spontaneous electrical activity of the:
(i)  Kidney 
(ii) Spinal cord
(iii) Heart
(iv) Brain

Chapter: [3.01] Human Health and Diseases
Concept: Common Diseases in Humans
[1]1.2.3

The genotype of a person withTumer's syndrome will be:
(i)   44+XXY
(ii)  44+XYY
(iii) 44+XO
(iv) 44+XXYY

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Genetic Disorders - Chromosomal Disorders
[1]1.2.4

Transcription is the transfer of genetic code from a DNA molecule to:
(i) RNA molecule
(ii) Second DNA molecule
(iii) Ribosomal sub unit·
(iv) Sequence of amino acids in a protein molecule

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Transcription - Introduction of Transcription
[4]1.3 | Give a scientific term for each of the following:
[1]1.3.1

Scientific term for the first formed category of photosynthetic organisms.

Chapter: [5.02] Ecosystem
Concept: Energy Flow
[1]1.3.2

Scientific term for the surgical removal of a section of fallopian tube.

Chapter: [1.03] Human Reproduction
Concept: Fertilisation and Implantation
[1]1.3.3

scientific term for an animal behaviour which benefits others but is of no advantage to itself.

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[1]1.3.4

Scientific term for the hydrostatic pressure developed inside the cell on the cell wall due to endosmosis.

Chapter: [4.02] Biotechnology and Its Applications
Concept: Stem Cell Technology
[4]1.4 | Expand the following abbreviations:
[1]1.4.1

Expand the STD

Chapter: [1.04] Reproductive Health
Concept: Sexually Transmitted Diseases (STDs)
[1]1.4.2

Expand NADP

Chapter: [5.02] Ecosystem
Concept: Energy Flow
[1]1.4.3

Expand MRI

Chapter: [3.01] Human Health and Diseases
Concept: Common Diseases in Humans
[1]1.4.4

Expand DDT

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes in Industrial Production
[4]1.5 | Name the scientists who· are associated with the following:
[1]1.5.1

Name the scientists who Discovered the fossil of Australopithecus

Chapter: [2.03] Evolution
Concept: Evidences for Evolution
[1]1.5.2

Name the scientists : Microspheres 

Chapter: [5.02] Ecosystem
Concept: Ecosystem – Structure and Function
[1]1.5.3

Name the scientists who Coined the term Diffusion Pressure Deficit

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Plant Breeding
[1]1.5.4

Name the scientists who Invented the CT scan

Chapter: [3.01] Human Health and Diseases
Concept: Introduction of Human Health and Diseases
[5]2
[3]2.1

Give any three characters that have developed during human evolution

Chapter: [2.03] Evolution
Concept: Evolution Stages
[1]2.2

Explain the term chemogeny

Chapter: [2.03] Evolution
Concept: Origin of Life
[1]2.3

Give any two distinctive features of Dryopithecus.

Chapter: [2.03] Evolution
Concept: Mechanism of Evolution
[5]3
[3]3.1

Explain the evolution of giraffe's neck according to Lamarck's theory of evolution.

Chapter: [2.03] Evolution
Concept: Evidences for Evolution
[1]3.2

Give two chromosomal similarities between man and apes.

Chapter: [2.03] Evolution
Concept: Modern Synthetic Theory of Evolution
[1]3.3

Name any two temporary embryonic structures in vertebrates which provide evidence for evolution.

Chapter: [2.03] Evolution
Concept: Evidences for Evolution
[5]4
[3]4.1

Persons suffering from sickle cell anaemia are at an advantage in Malaria infested areas. Explain .

Chapter: [3.01] Human Health and Diseases
Concept: Common Diseases in Humans
[1]4.2

Define the term gene flow

Chapter: [2.03] Evolution
Concept: Gene Flow and Genetic Drift
[1]4.3

What are analogous organs? Describe with one example from the plant kingdom.

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Plant Breeding
[10]5
[4]5.1

With the help of diagrams, name and describe the different types of placentation seen in angiosperms.

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Introduction of Sexual Reproduction in Flowering Plants
[4]5.2

Give four points of anatomical differences between a monocot stem and a dicot stem

Chapter: [4.02] Biotechnology and Its Applications
Concept: Stem Cell Technology
[2]5.3 | Define the following terms: ·
[1]5.3.1

Define Racemose inflorescence

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Flower – a Fascinating Organ of Angiosperms
[1]5.3.2

Define Osmotic pressure

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Plant Breeding
[10]6
[4]6.1

Draw a diagram of the internal structure of the human ovary.

Chapter: [1.03] Human Reproduction
Concept: Microscopic Anatomy of Ovary
[4]6.2

Define the term water potential.

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

What are components of water potential? Explain

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Plant Breeding
[2]6.3 | Give definition and importance of:
[1]6.3.1

Definition and importance of Imbibition

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Plant Breeding
[1]6.3.2

Definition and importance of Parturition

Chapter: [1.03] Human Reproduction
Concept: Fertilisation and Implantation
[10]7
[4]7.1

Give four adaptations in flowers pollinated by insects.

Chapter: [2.03] Evolution
Concept: Adaptive Radiation
[4]7.2

Describe the mass flow hypothesis for translocation of organic solutes (food) in plants.

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Plant Breeding
[2]7.3

Write a brief note on the causes of infertility.

Chapter: [1.04] Reproductive Health
Concept: Infertility
[10]8
[4]8.1

Give any four reasons for Mendel's success.

Chapter: [2.01] Principles of Inheritance and Variation
Concept: Mendel’s Laws of Inheritance
[4]8.2

Briefly describe the technique employed in DNA fingerprinting.

Chapter: [2.02] Molecular Basis of Inheritance
Concept: DNA Fingerprinting
[2]8.3

Give any two features of Genetic Code.

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Search for Genetic Material - Introduction of Search for Genetic Material
[10]9
[4]9.1

Explain the mechanism of action of T cells to antigens.

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Introduction of Molecular Basis of Inheritance
[4]9.2

Explain how insulin can be produced using recombinant DNA  technology.

Chapter: [4.02] Biotechnology and Its Applications
Concept: Biotechnological Applications in Medicine
[2]9.3

What is pisiculture? Give one advantage.

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[10]10
[4]10.1

Name the causative organism and preventive measures for Swine flu

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

Name the causative organism and preventive measures for Typhoid

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

Name the causative organism and preventive measures for Filariasis

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

Name the causative organism and preventive measures for Syphilis

Chapter: [3.01] Human Health and Diseases
Concept: Infectious and Non Infectious Disease
[4]10.2

State four causes of population growth.

Chapter: [5.01] Organisms and Populations
Concept: Introduction of Organisms and Populations

State consequences of population growth.

Chapter: [5.01] Organisms and Populations
Concept: Introduction of Organisms and Populations
[2]10.3

Differentiate between: Cannabinoids and Barbiturates

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

Differentiate between Biotic potential and Carrying capacity

Chapter: [5.01] Organisms and Populations
Concept: Ecology (Organism, Population, Community and Biome)
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