ISC (Commerce) Class 12CISCE
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Question Paper Solutions for Biology (Theory) Paper 1 2013-2014 ISC (Commerce) Class 12

Question 1 is Compulsory

Attempt Any Two Question From Question 2 to Question 4

Attempt Any Two Question From Question 5 to Question 7

Attempt Any Two Question From Question 8 to Question 10


Marks: 70
[20]1
[5]1.1

Mention one significant difference between Parenchyma and Sclerenchyma.

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

Mention one significant difference between Epistasis and dominance

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

Mention one significant difference between Hormones of ovulatory phase and hormones of luteal phase

Chapter: [1.03] Human Reproduction
Concept: Menstrual Cycle

Mention one significant difference between Symplastic movement and apoplastic movement

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

Mention one significant difference between Phenotype and Genotype

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Search for Genetic Material - Introduction of Search for Genetic Material
[5]1.2

Give reasons for the following:

Testes descend into the scrotum before birth.

Chapter: [1.03] Human Reproduction
Concept: Microscopic Anatomy of Testis

Give reasons for the following:

Secondary growth does not occur in monocot stems.

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain

Give reasons for the following:

Nitrogenous fertilizers are not applied in fields where leguminous crops grow.

Chapter: [3.03] Microbes in Human Welfare
Concept: Microbes as Biocontrol Agents

Give reasons for the following:

The genetic code is 'universal'

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

Give reasons for the following:

At higher temperatures, green plants start evolving CO2 instead of O2.

Chapter: [5.02] Ecosystem
Concept: Introduction and Types of Ecosystem
[5]1.3

In the following questions/statements has four suggested answers. Rewrite the correct answer

Typhoid is classified as a:

(A) Viral disease

(B) Genetic disorder

(C) Bacterial disease

(D) Protozoan disease

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

In the following questions/statements has four suggested answers. Rewrite the correct answer

Bt cotton is resistant to:

(A) Insects

(B) Herbicides

(C) Salt

(D) Drought

Chapter: [4.02] Biotechnology and Its Applications
Concept: Biotechnological Applications in Agriculture

In the following questions/statements has four suggested answers. Rewrite the correct answer

Roots and shoots lengthen through the activity of:

(A) Apical meristem

(B) Vascular Cambium

(C) Lateral meristem

(D) Cork Cambium

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

In the following questions/statements has four suggested answers. Rewrite the correct answer

An antiviral protein released from infected and dying cells is:

(A) Antigen

(B) Antibody

(C) Antiserum

(D) Interferon

Chapter: [3.01] Human Health and Diseases
Concept: Concept of Immunity

In the following questions/statements has four suggested answers. Rewrite the correct answer

Opening and closing of stomata is due to:

(A) Ca2+

(B) Na+

(C) K+

(D) Cl–

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Tissue Culture
[3]1.4

State the best-known contribution of Alec Jeffery

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

State the best-known contribution of P.K. Sethi

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

State the best-known contribution of Hugo de Vries

Chapter: [2.03] Evolution
Concept: Gene Flow and Genetic Drift
[2]1.5

Expand the following: SCID

Chapter: [3.01] Human Health and Diseases
Concept: Concept of Immunity

Expand the following: ZIFT

Chapter: [1.04] Reproductive Health
Concept: Infertility
[5]2
[3]2.1

Describe the Miller and Urey experiment on the origin of life

Chapter: [2.03] Evolution
Concept: Origin of Life
[2]2.2

Define Frameshift mutations

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

Define Genetic drift.

Chapter: [2.03] Evolution
Concept: Gene Flow and Genetic Drift
[5]3
[3]3.1

Name and define the three types of natural selection.

Chapter: [2.03] Evolution
Concept: Darwin'S Contribution
[2]3.2

State the following:

Hardy Weinberg’s principle

Chapter: [2.03] Evolution
Concept: Hardy - Weinberg'S Principle

State the following:

Theory of recapitulation

Chapter: [2.03] Evolution
Concept: Modern Synthetic Theory of Evolution
[5]4
[3]4.1

Mention any three characteristics of Neanderthal man that lived in near east and central Asia.

Chapter: [2.03] Evolution
Concept: Origin and Evolution of Man
[2]4.2

What are homologous organs?

Chapter: [2.03] Evolution
Concept: Evidences for Evolution

How do homologous organs help in providing evidence for organic evolution?

Chapter: [2.03] Evolution
Concept: Evidences for Evolution
[10]5
[4]5.1

Describe the different types of vascular bundles.

Chapter: [1.02] Sexual Reproduction in Flowering Plants
Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
[3]5.2

Give three anatomical differences between a monocot root and a dicot root

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Tissue Culture
[3]5.3

Explain the effect of light and temperature on photosynthesis.

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

Explain the transpiration pull theory for an ascent of sap

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Tissue Culture
[3]6.2

What is spermatogenesis? Briefly describe the process of spermatogenesis.

Chapter: [1.03] Human Reproduction
Concept: Gametogenesis
[3]6.3

Define Placentation

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

Define Parthenocarpy

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

Define Diffusion

Chapter: [5.02] Ecosystem
Concept: Energy Flow
[10]7
[4]7.1

Why are xylem and phloem classified as complex tissues?

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

Describe the structure of phloem.

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Tissue Culture
[3]7.2

Describe the ultra-structure of a chloroplast.

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Single Cell Protein (SCP)
[3]7.3

State three functions of the placenta

Chapter: [1.03] Human Reproduction
Concept: Fertilisation and Implantation
[10]8
[4]8.1

Describe the experiment performed by Griffith. What conclusions did he infer from his observations?

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Search for Genetic Material - Introduction of Search for Genetic Material
[3]8.2

What is artificial insemination? Mention two ways in which it is useful in the breeding of dairy animals

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Animal Husbandry
[3]8.3

What is single cell protein? Give its source and significance

Chapter: [3.02] Strategies for Enhancement in Food Production
Concept: Single Cell Protein (SCP)
[10]9
[4]9.1

How did Hershey and Chase prove that DNA is the genetic material?

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Search for Genetic Material - Introduction of Search for Genetic Material
[3]9.2

Give one main application of MRI

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

Give one main application of Ultrasound

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

Give one main application of ECG

Chapter: [3.01] Human Health and Diseases
Concept: Infectious and Non Infectious Disease
[3]9.3

Explain the role of stem cells in medical treatment.

Chapter: [4.02] Biotechnology and Its Applications
Concept: Stem Cell Technology
[10]10
[4]10.1

Write short notes on Multiple Alleles

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

Write short notes on Artificial measures to control population

Chapter: [1.04] Reproductive Health
Concept: Population Explosion and Birth Control
[3]10.2

What complications will arise if the blood of an Rh-positive person is transfused to an Rh-negative person and vice versa?

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

State any three goals of the human genome project

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Human Genome Project
[3]10.3

State any three goals of the human genome project

Chapter: [2.02] Molecular Basis of Inheritance
Concept: Human Genome Project
S