Date: April 2022
Duration: 1h30m
Note :
- Candidates are allowed an additional 10 minutes for only reading the paper.
- They must NOT start writing during this time.
- Internal choices have been provided in one question in Section B and one question in Section C.
- The intended marks for questions are given in brackets [ ].
Give the biological name of the causative agent of gonorrhoea.
Chapter: [0.031] Human Health and Diseases
Sonora – 64 is a variety of ______.
Wheat
Rice
Maize
Sugarcane
Chapter: [0.032] Strategies for Enhancement in Food Production
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.
Chapter: [0.054000000000000006] Environmental Issues
Give one significant contribution to the following scientists:
Prof. R. Mishra
Chapter: [0.051] Organisms and Populations
Expand the term ADA.
Chapter: [0.031] Human Health and Diseases
A substance that stimulates the production of antibodies is called ______.
Chapter: [0.031] Human Health and Diseases
Why does a large ozone hole develop specifically over Antarctica?
Chapter: [0.054000000000000006] Environmental Issues
Briefly explain the role of the following in providing defence against infection in the human body:
B-cells
Chapter: [0.031] Human Health and Diseases
Briefly explain the role of the following in providing defence against infection in the human body:
T-cells
Chapter: [0.031] Human Health and Diseases
What is the role of a probe in recombinant DNA technology?
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
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.
Chapter: [0.054000000000000006] Environmental Issues
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.
Chapter: [0.052000000000000005] Ecosystem
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.
Chapter: [0.051] Organisms and Populations
Give any four advantages of mutation breeding.
Chapter: [0.032] Strategies for Enhancement in Food Production
Name and describe the technique that helps in separation of DNA fragments.
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
Which molecules are called molecular scissors? Why are they called so?
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
Differentiate between primary and secondary succession provided one example of each.
Chapter: [0.052000000000000005] Ecosystem
Study the graph given below and answer the following questions:
- Explain the ecological principle represented by the graph and write a mathematical expression for the same.
- What will happen if the slope of the line ‘b’ becomes steeper?
Chapter: [0.053] Biodiversity and Its Conservation
Explain the steps involved in the process of plant breeding.
Chapter: [0.032] Strategies for Enhancement in Food Production
The rDNA technology has provided a method to control the nematode parasite Meloidogyne incognita. Explain the principle involved in this technique.
Chapter: [0.040999999999999995] Biotechnology - Principles and Processes
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.
Chapter: [0.052000000000000005] Ecosystem
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 |
Chapter: [0.051] Organisms and Populations
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CISCE previous year question papers Class 12 Biology (Theory) with solutions 2021 - 2022
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