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Class 12th Board 2018

Class 12th Board exam papers

Last 6 years - Previous year question papers

Chapter 1: Class 12th Board 2020

411 questions

Chapter 2: Class 12th Board 2019

329 questions

Chapter 3: Class 12th Board 2018

107 questions

Biology Chemistry Mathematics Physics

Chapter 4: Class 12th Board 2017

107 questions

Chapter 5: Class 12th Board 2016

104 questions

Chapter 6: Class 12th Board 2015

104 questions

Class 12th Board 2018

Topic List

questions: 107

Verified solutions and explanations

Verified

Easy (107)

Question 1

Easy

Write the dual purpose served by Deoxyribonucleoside triphosphates in polymerisation.

Topic:

Molecular Basis of Inheritance

Exam:

Class 12th Board 2018

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Question 2

Easy

Name two diseases whose spread can be controlled by the eradication of Aedes mosquitoes.

Topic:

Human Health and Disease

Exam:

Class 12th Board 2018

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Question 3

Easy

How do cytokine barriers provide innate immunity in humans?

Topic:

Human Health and Disease

Exam:

Class 12th Board 2018

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Question 4

Easy

Write the names of the following :
(a) A

15

mya primate that was ape-like
(b) A

2

mya primate that lived in East African grasslands

Topic:

Evolution

Exam:

Class 12th Board 2018

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Question 5

Easy

Mention the chemical change that pro-insulin undergoes, to be able to act as mature insulin.

Topic:

Biotechnology and its Applications

Exam:

Class 12th Board 2018

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Question 6

Easy

Your advice is sought to improve the nitrogen content of the soil to be used for cultivation of a non-leguminous terrestrial crop.
(a) Recommend two microbes that can enrich the soil with nitrogen.
(b) Why do leguminous crops not require such enrichment of the soil ?

Topic:

Biotechnology and its Applications

Exam:

Class 12th Board 2018

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Question 7

Easy

With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations ?

Topic:

Evolution

Exam:

Class 12th Board 2018

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Question 8

Easy

How did a citizen group called Friends of Arcata Marsh, Arcata, California, USA, help to improve the water quality of the marshland using Integrated Waste Water Treatment? Explain in four steps.

Topic:

Microbes in Human Welfare

Exam:

Class 12th Board 2018

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Question 9

Easy

You have obtained a high-yielding variety of tomato. Name and explain the procedure that ensures retention of the desired characteristics repeatedly in large populations of future generations of the tomato crop.

Topic:

Biotechnology and its Applications

Exam:

Class 12th Board 2018

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Question 10

Easy

(a) Name the source plant of heroin drug. How is it obtained from the plant?
(b) Write the effects of heroin on the human body.

Topic:

Human Health and Disease

Exam:

Class 12th Board 2018

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Question 11

Easy

Draw a diagram of mature human sperm. Label any three parts and write their functions.

Topic:

Human Reproduction

Exam:

Class 12th Board 2018

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Question 12

Easy

(a) Expand VNTR and describe its role in DNA fingerprinting.
(b) List any two applications of DNA fingerprinting technique.

Topic:

Molecular Basis of Inheritance

Exam:

Class 12th Board 2018

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Question 13

Easy

Differentiate between Parthenocarpy and Parthenogenesis. Give one example of each.

Topic:

Sexual Reproduction in Flowering Plants

Exam:

Class 12th Board 2018

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Question 14

Easy

Medically it is advised to all young mothers that breastfeeding is the best for their newborn babies. Do you agree? Give reasons in support of your answer.

Topic:

Human Reproduction

Exam:

Class 12th Board 2018

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Question 15

Easy

Explain the mechanism of ‘sex determination’ in birds. How does it differ from that of human beings ?

Topic:

Principles of Inheritance and Variation

Exam:

Class 12th Board 2018

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Question 16

Easy

(a) How has the development of bioreactors helped in biotechnology?
(b) Name the most commonly used bioreactor and describe its working.

Topic:

Biotechnology and its Applications

Exam:

Class 12th Board 2018

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Question 17

Easy

Explain the roles of the following with the help of an example each in recombinant DNA technology:
(a) Restriction Enzymes
(b) Plasmids

Topic:

Biotechnology: Principles and Processes

Exam:

Class 12th Board 2018

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Question 18

Easy

Explain out-breeding, out-crossing and cross-breeding practices in animal husbandry.

Topic:

Strategies for Enhancement in Food Production

Exam:

Class 12th Board 2018

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Question 19

Easy

(a) Organic farmers prefer biological control of diseases and pests to the use of chemicals for the same purpose. Justify.
(b) Give an example of a bacterium, a fungus and an insect that are used as biocontrol agents.

Topic:

Biotechnology and its Applications

Exam:

Class 12th Board 2018

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Question 20

Easy

(a) Differentiate between analogous and homologous structures.
(b) Select and write analogous structures from the list given below :
(i) Wings of butterfly and birds
(ii) Vertebrate hearts
(iii)Tendrils of bougainvillea and cucurbita
(iv) Tubers of sweet potato and potato

Topic:

Evolution

Exam:

Class 12th Board 2018

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