Biology (Theory) Set 1 2021-2022 ISC (Commerce) Class 12 Question Paper Solution

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Biology (Theory) [Set 1]
Marks: 35 CISCE
ISC (Commerce)
ISC (Arts)
ISC (Science)

Academic Year: 2021-2022
Date: April 2022
Duration: 1h30m
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 Note :

  1. Candidates are allowed an additional 10 minutes for only reading the paper.
  2. They must NOT start writing during this time.
  3. Internal choices have been provided in one question in Section B and one question in Section C.
  4. The intended marks for questions are given in brackets [ ]. 

SECTION - A
[7]1
[1]1.i

Give the biological name of the causative agent of gonorrhoea.

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

Sonora – 64 is a variety of ______.

Wheat

Rice

Maize

Sugarcane

Concept: Plant Breeding
Chapter: [0.032] Strategies for Enhancement in Food Production
[1]1.iii

Assertion: PAN is a secondary pollutant.

Reason: The secondary pollutants are produced by the combination of primary emitted pollutants in the atmosphere.

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: Pollution
Chapter: [0.054000000000000006] Environmental Issues
[1]1.iv

Give one significant contribution to the following scientists:

Prof. R. Mishra

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

Expand the term ADA.

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

A substance that stimulates the production of antibodies is called ______.

Concept: Antibodies
Chapter: [0.031] Human Health and Diseases
[1]1.vii

Why does a large ozone hole develop specifically over Antarctica?

Concept: Ozone Layer Depletion - Ozone Depletion in the Stratosphere
Chapter: [0.054000000000000006] Environmental Issues
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SECTION - B
[2]2
[1]2.i

Briefly explain the role of the following in providing defence against infection in the human body:

B-cells

Concept: Antibodies
Chapter: [0.031] Human Health and Diseases
[1]2.ii

Briefly explain the role of the following in providing defence against infection in the human body:

T-cells

Concept: Antibodies
Chapter: [0.031] Human Health and Diseases
[2]3

What is the role of a probe in recombinant DNA technology?

Concept: Genetic Engineering (Recombinant DNA Technology).
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[2]4

The level of air pollution is very high in a city. Suggest any four measures which should be taken by the government to control it.

Concept: Prevention of Air Pollution
Chapter: [0.054000000000000006] Environmental Issues
[2]5
[2]5.i

If 20000 K Cal energy is available at the level of producers, what will be the amount of energy available at the level of secondary consumers.

Concept: Energy Flow in an Ecosystem
Chapter: [0.052000000000000005] Ecosystem
OR
[2]5.ii

The number of mice in a laboratory was 100 on a particular day. After one year their number increased to 120. Calculate the growth rate in the population.

Concept: Population Growth
Chapter: [0.051] Organisms and Populations
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[2]6

Give any four advantages of mutation breeding.

Concept: Plant Breeding
Chapter: [0.032] Strategies for Enhancement in Food Production
[2]7

Name and describe the technique that helps in separation of DNA fragments.

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

Which molecules are called molecular scissors? Why are they called so?

Concept: Process and Principles of Biotechnology
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[2]9

Differentiate between primary and secondary succession provided one example of each.

Concept: Ecological Succession
Chapter: [0.052000000000000005] Ecosystem
SECTION - C
[3]10

Study the graph given below and answer the following questions:

  1. Explain the ecological principle represented by the graph and write a mathematical expression for the same.
  2. What will happen if the slope of the line ‘b’ becomes steeper?
Concept: Importance of Biodiversity
Chapter: [0.053] Biodiversity and Its Conservation
[3]11

Explain the steps involved in the process of plant breeding.

Concept: Steps in Plant Breeding
Chapter: [0.032] Strategies for Enhancement in Food Production
[3]12

The rDNA technology has provided a method to control the nematode parasite Meloidogyne incognita. Explain the principle involved in this technique.

Concept: Process and Principles of Biotechnology
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
[3]13
[3]13.i

Consider the amount of organic matter at the different trophic levels in an ecosystem given below:

Trophic Level Amount of organic matter (in Kg)
Tertiary consumers 250
Primary consumers 150
Primary producers 100
Secondary Consumers 200

On the basis of the data provided above, construct an ecological pyramid. Comment upon its nature giving at least one example of the type of organism occupying each of the above mentioned trophic levels.

Concept: Energy Flow in an Ecosystem
Chapter: [0.052000000000000005] Ecosystem
OR
[3]13.ii

On the basis of the demographic data of a country given below, construct an age pyramid and explain whether the population is stable, declining or growing.

Age group No. of individuals
Pre-reproductive 20,000
Reproductive 15,000
Post-reproductive 10,000
Concept: Population Growth
Chapter: [0.051] Organisms and Populations

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