Biology (Theory) Official 2022-2023 ISC (Science) ISC Class 12 Question Paper Solution

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Biology (Theory) [Official]
Marks: 70 CISCE
ISC (Science)

Academic Year: 2022-2023
Date & Time: 17th March 2023, 2:00 pm
Duration: 3h
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  1. Candidates are allowed an additional 15 minutes for only reading the paper.
  2. They must NOT start writing during this time.
  3. This paper is divided into four sections A, B, C and D.
  4. Answer all questions.
  5. Section A consists of one question having sub-parts of one mark each.
  6. Section B consists of ten questions of two marks each.
  7. Section C consists of seven questions of three marks each and
  8. Section D consists of three questions of five marks each.
  9. Internal choices have been provided in one question each in Section B, Section C and Section D.
  10. The intended marks for questions or parts of questions are given in brackets [].

SECTION A - 20 MARKS
[20]1 | Answer the following questions briefly.
[1]1.i

Name the source of thermostable DNA polymerase.

Concept: Process and Principles of Biotechnology
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[1]1.ii

Mention the scientific name of protozoan parasite that causes Amoebiasis.

Concept: Population Interactions
Chapter: [0.051] Organisms and Populations
[1]1.iii

What is cryopreservation?

Concept: Transgenic Animals
Chapter: [0.042] Biotechnology and Its Applications
[1]1.iv

The maternal grandfather of a boy is colorblind, but his maternal grandmother is normal. The father of the boy is also normal. What is the probability of this boy being colorblind?

Concept: Mendelian Inheritance - Mendel’s Laws of Heredity
Chapter: [0.021] Principles of Inheritance and Variation
[1]1.v

Name the type of antibody that can be transferred through the placenta.

Concept: Pregnancy and Embryonic Development
Chapter: [0.013000000000000001] Human Reproduction
[1]1.vi

During which phase of the cell cycle, does DNA replication take place? 

Concept: DNA Replication - The Experimental Proof
Chapter: [0.022000000000000002] Molecular Basis of Inheritance
[1]1.vii

How many sets of primers are required in each cycle of PCR?

Concept: Process and Principles of Biotechnology
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[1]1.viii

Define perisperm.

Concept: Events in Sexual Reproduction in Organisms - Pre-fertilisation Events in Organisms
Chapter: [0.011000000000000001] Reproduction in Organisms
[1]1.ix

Which one of the following enzymes is used to join DNA fragments? 

DNA polymerase

Ligase

Primase

Endonuclease

Concept: Process and Principles of Biotechnology
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[1]1.x

What type of ecological pyramid would be obtained from the following data?

Secondary consumer: 120 gm
Primary consumer: 60 gm
Primary producer: 10 gm

Inverted pyramid of biomass

Pyramid of energy

Upright pyramid of numbers

Upright pyramid of biomass

Concept: Ecosystem - Structure and Function
Chapter: [0.052000000000000005] Ecosystem
[1]1.xi

Assertion: A person who has received a cut from a sharp object and is bleeding, needs to be given an anti-tetanus injection.

Reason: Anti-tetanus injection stimulates the production of antibodies for tetanus.

Both Assertion and Reason are true, and Reason is the correct explanation of Assertion.

Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.

Assertion is true, but Reason is false.

Both Assertion and Reason are false.

Concept: Vaccination and Immunization
Chapter: [0.031] Human Health and Diseases
[1]1.xii

Which one of the following factors is responsible for activation of protoxin into active Bt toxin of Bacillus thuringiensis?

Body temperature

Moist surface of midgut

Alkaline pH of gut

Acidic pH of stomach

Concept: Microbes in Household Products
Chapter: [0.033] Microbes in Human Welfare
[2]1.xiii
[1]1.xiii.a

Give one significant contribution of the following scientist:

T.R. Malthus

Concept: Population Explosion - Rising Population a Global Threat
Chapter: [0.013999999999999999] Reproductive Health
[1]1.xiii.b

Give one significant contribution to the following scientists:

Prof. R. Mishra

Concept: Ecology (Organism, Population, Community and Biome)
Chapter: [0.051] Organisms and Populations
[2]1.xiv
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[1]1.xiv.a

Give a term for the following:

An ART in which eggs are removed from the ovary of the female, fertilised and then placed in her fallopian tube.

Concept: Infertility
Chapter: [0.013999999999999999] Reproductive Health
[1]1.xiv.b

Give a term for the following:

Fusion of male gamete and secondary nucleus in angiosperms.

Concept: Double Fertilization and Triple Fusion in Plant
Chapter: [0.012] Sexual Reproduction in Flowering Plants
[2]1.xv
[1]1.xv.a

Expand the following abbreviation:

NACO

Concept: Sexually Transmitted Diseases (STD)
Chapter: [0.013999999999999999] Reproductive Health [0.031] Human Health and Diseases
[1]1.xv.b

Expand the following abbreviation:

PID

Concept: Sexually Transmitted Diseases (STD)
Chapter: [0.013999999999999999] Reproductive Health [0.031] Human Health and Diseases
[2]1.xvi
[1]1.xvi.a

Give a reason for the following:
Cattle avoid browsing on Calotropis plant.

Concept: Animal Husbandry (Livestock) - Dairy Farming
Chapter: [0.032] Strategies for Enhancement in Food Production
[1]1.xvi.b

Give a reason for the following:

DNA cannot enter directly into the host cell.

Concept: Process and Principles of Biotechnology
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
SECTION B - 14 MARKS
[2]2
[1]2.i

Give one difference between the following pair:

Sites of maturation of B-lymphocytes and T-lymphocytes

Concept: Types of Immunity
Chapter: [0.031] Human Health and Diseases
[1]2.ii

Give one difference between the following pairs:

Sources of Opioids and Cannabinoids

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [0.031] Human Health and Diseases
[2]3

Briefly discuss any two methods by which plants avoid self-pollination.

Concept: Pollination
Chapter: [0.012] Sexual Reproduction in Flowering Plants
[2]4

Mention the location and the function of Leydig cells.

Concept: Human Reproductive System - The Male Reproductive System
Chapter: [0.013000000000000001] Human Reproduction
[2]5
[2]5.i

What are the vestigial organs?

Concept: Lymphoid Organs
Chapter: [0.031] Human Health and Diseases

Give any one example of a vestigial organ in human body.

Concept: Lymphoid Organs
Chapter: [0.031] Human Health and Diseases
OR
[2]5.ii

State Hardy Weinberg's principle.

Concept: Hardy Weinberg’s Principle
Chapter: [0.023] Evolution

Give a mathematical expression for Hardy Weinberg's principle.

Concept: Hardy Weinberg’s Principle
Chapter: [0.023] Evolution
[2]6

Riya went to the hospital to meet her sister who was undergoing some treatment. The hospital was crowded with patients suffering from various types of allergies, pneumonia and Ascariasis. Name the disease that Riya is most likely to get infected with. Give one reason for your answer.

Concept: Infectious and Non Infectious Disease
Chapter: [0.031] Human Health and Diseases
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[2]7

State the steps involved in the process of gene therapy for the treatment of ADA-deficiency.

Concept: Process and Principles of Biotechnology
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[2]8

The pedigree chart given below represents the pattern of inheritance of sickle cell anemia in a family. Study it carefully and answer the questions that follow.

  1. What is the genotype of the father?
  2. What is the phenotype of the mother?
Concept: Extensions of Mendelian Genetics (Deviation from Mendelism) - Polygenic Inheritance
Chapter: [0.021] Principles of Inheritance and Variation
SECTION C - 21 MARKS
[2]9

List any three major causes of loss of biodiversity.

Concept: Loss of Biodiversity
Chapter: [0.053] Biodiversity and Its Conservation
[3]10
[3]10.i

Name and explain the technique used for separating DNA fragments and making them available for biotechnology experiments.

Concept: Process and Principles of Biotechnology
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
OR
[3]10.ii

Study the diagram given below and answer the questions that follow.

  1. Name the cloning vector shown above. In which organism in this cloning vector inserted?
  2. Mention any two restriction sites shown in the diagram.

  3. Name any two selectable markers shown in the diagram.
Concept: Process and Principles of Biotechnology
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[3]11

Draw a neat labelled diagram of L.S. of anatropous ovule.

Concept: Introduction of Sexual Reproduction in Flowering Plants
Chapter: [0.012] Sexual Reproduction in Flowering Plants
[3]12
[1.5]12.i

Explain the process of sex determination in Grasshopper.

Concept: Sex Determination - Sex Determination in Some Insects
Chapter: [0.021] Principles of Inheritance and Variation
[1.5]12.ii

What is the genotype of Turner's Syndrome?

Concept: Genetic Disorders
Chapter: [0.021] Principles of Inheritance and Variation [0.021] Principles of Inheritance and Variation

Mention any one symptom of Turner's syndrome.

Concept: Genetic Disorders
Chapter: [0.021] Principles of Inheritance and Variation [0.021] Principles of Inheritance and Variation
[3]13

With the help of neatly labelled diagrams, explain the different types of age pyramids of human population.

Concept: Population - Population Attributes
Chapter: [0.051] Organisms and Populations
[3]14

The scientists from a research institute collected samples of

water from sewage pipes of two different cities, A and B.

On analysis, the BOD value of the sample from city A was

found to be 500 mg/L. The BOD value of the sample from

city B was 200 mg/L.

  1. Which one of the two cities needs a sewage treatment plant?
  2. Briefly discuss the steps involved in the treatment of sewage.
  3. What will be the effect of sewage treatment on the value of BOD?
Concept: Eutrophication
Chapter: [0.054000000000000006] Environmental Issues
[3]15

The diagram given below shows the life cycle of a malarial parasite. Study it carefully and answer the questions that follows:

  1. Name the hosts in which the asexual phase and sexual phase of the life cycle takes place.
  2. Identify the infective stage labelled ‘D’.
  3. Name the structure labelled ‘A’ and ‘E’.
  4. Give any one symptom of malaria.
Concept: Population Interactions
Chapter: [0.051] Organisms and Populations
SECTION D -15 MARKS
[5]16

Explain the components of the structural genes in the Lac operon system in E.coli.

Concept: Regulation of Gene Expression - The Lac Operon
Chapter: [0.022000000000000002] Molecular Basis of Inheritance

How does the operon function in the presence of lactose?

Concept: Regulation of Gene Expression - The Lac Operon
Chapter: [0.022000000000000002] Molecular Basis of Inheritance
[5]17
[5]17.i

Given below is the diagram depicting the menstrual cycle in human beings. Study it carefully and answer the questions that follow.

  1. Which phases are indicated by ‘C’ and ‘D’?
  2. Name the structures labelled ‘F’. What is its role?
  3. Explain the changes in the level of progesterone during phases ‘C’ and ‘D’.
  4. Which hormone present in the urine confirms pregnancy in human beings?
  5. Identify the structure labelled ‘E’. Name the hormone released by it.
Concept: Menstrual Cycle (Ovarian Cycle)
Chapter: [0.013000000000000001] Human Reproduction
OR
[5]17.ii

According to a survey conducted by the Government of India in the year 1950, the population of the country was 350 million. In the next survey conducted in the year 2010, the population had reached above 1000 million.

  1. List any two reasons for this rise in the population.
  2. Suggest any two steps which should be taken by the Government to control this rise.
  3. How does the population explosion affect the growth of a country?
  4. What is the difference between the natural and artificial contraceptive methods? Give one example of each method.
Concept: Population Explosion - Rising Population a Global Threat
Chapter: [0.013999999999999999] Reproductive Health
[5]18

Describe the mechanism of decomposition by explaining the various processes involved in it.

Concept: Decomposition
Chapter: [0.052000000000000005] Ecosystem

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