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Biology Delhi Set 1 2016-2017 CBSE (Arts) Class 12 Question Paper Solution

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Biology [Delhi Set 1]
Marks: 70Academic Year: 2016-2017
Date & Time: 4th April 2017, 12:30 pm
Duration: 3h

[1]1

Our government has intentionally imposed strict conditions for M.T.P. in our country. Justify giving a reason.

Concept: Reproductive Health - Problems and Strategies
Chapter: [1.04] Reproductive Health [1.04] Reproductive Health
[1]2

State the fate of a pair of autosomes during gamete formation.

Concept: Sexual Reproduction - Pre-fertilisation Events - Gametogenesis
Chapter: [1.01] Reproduction in Organisms
[1]3

What role does an individual organism play as per Darwin's theory of natural selection?

Concept: Evolution of Life Forms - a Theory
Chapter: [2.03] Evolution
[1]4

Suggest a method to ensure an anamnestic response in humans.

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[1]5

What is biopiracy?

Concept: Ethical Issues
Chapter: [4.02] Biotechnology and Its Application
[2]6

How does the megaspore mother cell develop into 7-celled, 8 nucleate embryo sac in an angiosperm?

Concept: Embryo Development Upto Blastocyst Formation
Chapter: [1.03] Human Reproduction

Draw a labeled diagram of a mature embryo sac.

Concept: Embryo Development Upto Blastocyst Formation
Chapter: [1.03] Human Reproduction
[2]7 | Attempt any one
[2]7.1

Describe the structure of a nucleosome.

Concept: The DNA - Packaging of Dna Helix
Chapter: [2.02] Molecular Basis of Inheritance
[2]7.2

Mention the evolutionary significance of the Shrews

Concept: Evolution of Life Forms - a Theory
Chapter: [2.03] Evolution

Mention the evolutionary significance of the Lobefins

Concept: Evolution of Life Forms - a Theory
Chapter: [2.03] Evolution

Mention the evolutionary significance of the Homo habilis

Concept: Evolution of Life Forms - a Theory
Chapter: [2.03] Evolution

Mention the evolutionary significance of the Homo erectus

Concept: Evolution of Life Forms - a Theory
Chapter: [2.03] Evolution
[2]8

In an agricultural field there is a prevalence of the following organisms and crop diseases which are affecting the crop yield badly:
(a) White rust
(b) Leaf and stripe rust
(c) Black rot
(d) Jussids

Recommend the varieties of crops the farmers should grow to get rid of the existing problem and thus improve the crop yiel.

Concept: Plant Breeding
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]9

How does the application of the fungal genus, Glomus, to the agricultural farm increase the farm output? 

Concept: Microbes as Biofertilisers
Chapter: [3.03] Microbes in Human Welfare
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[2]10

Plenty of algal bloom is observed in a pond in your locality.

(a) Write what has caused this bloom and how does it affect the quality of water.
(b) Suggest a preventive measure.

Concept: Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
[3]11

List the three states the annuals and biennial angiosperms have to pass through during their life cycle.

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants

List and describe any two vegetative propagules in flowering plants.

Concept: Asexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[3]12

Describe the structure of a seminiferous tubule.

Concept: The Male Reproductive System
Chapter: [1.03] Human Reproduction
[3]13

During a medical investigation, an infant was found to possess an extra  chromosome-21. Describe the symptoms the child is likely to develop later in the life.

Concept: Genetic Disorders - Chromosomal Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[3]14

A number of passengers were severely burnt beyond recognition during a train accident. Name and describe a modern technique that can help hand over the dead to their relatives.

Concept: DNA Fingerprinting
Chapter: [2.02] Molecular Basis of Inheritance
[3]15

p2 + 2pq + q2 = 1. Explain this algebraic equation on the basis of Hardy Weinberg's principle.

Concept: Hardy - Weinberg'S Principle
Chapter: [2.03] Evolution
[3]16

What precaution(s) would you recommend to a patient requiring repeated blood transfusion? 

Concept: AIDS
Chapter: [3.01] Human Health and Diseases

If the advise is not followed by the patient, there is an apprehension that the patient might contract a disease that would destroy the immune system of his/her body. Explain with the help of schematic diagram only how the immune system would get affected and destroyed.

Concept: AIDS
Chapter: [3.01] Human Health and Diseases
[3]17

What is inbreeding depression?

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

Explain the importance of "selection" during inbreeding in cattle

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[3]18

Describe how do 'flocs' and 'activated sludge' help in Sewage Treatment.

Concept: Microbes in Sewage Treatment
Chapter: [3.03] Microbes in Human Welfare
[3]19

Explain the role of Restriction endonuclease in Biotechnology

Concept: Introduction of Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application

Explain the role of the Gel − electrophoresis in Biotechnology

Concept: Introduction of Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application

Explain the role of the Selectable markers in pBR322 in Biotechnology.

Concept: Introduction of Biotechnology and Its Application
Chapter: [4.02] Biotechnology and Its Application
[3]20

Write the steps you would suggest to be undertaken to obtain a foreign-gene-product.

Concept: Tools of Recombinant Dna Technology - Competent Host (For Transformation with Recombinant Dna)
Chapter: [4.01] Biotechnology - Principles and Processes
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[3]21

Why do lepidopterans die when they feed on Bt cotton plant? Explain how does it happen.

Concept: Biotechnological Applications in Agriculture
Chapter: [4.02] Biotechnology and Its Application
[3]22

'in-situ' Conservation can help endangered/threatened species. Justify the statement.

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation

Name and describe any three causes of bio-diversity losses.

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[4]23

Public all over India is very much concerned about the deteriorating air quality in large parts of North India. Alarmed by this situation the Resident's Welfare Association of your locality organized an awareness programme entitled "Bury not burn". They invited you, being a biology student to participate.

(a) How would you justify your arguments that promote burying and discourage burning? (Give two reasons)

(b) With the help of flow charts, one for each practice depict the chain of events that follow.

Concept: Water Pollution and Its Control - Domestic Sewage and Industrial Effluents
Chapter: [5.04] Environmental Issues
[5]24 | Attempt any one
[5]24.1

Read the following statement and answer the questions that follow : 
"A guava fruit has 200 viable seeds."
(a) What are viable seeds?
(b) Write the total number of :
(i) Pollen grains (ii) Gametes
in producing 200 viable guava seeds.
c) Prepare a flow-chart to depict the post-pollination events leading to viable-seed production in a flowering plant.
 

Concept: Sexual Reproduction in Flowering Plants (Questions)
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[5]24.2

(a) Arrange the following hormones in sequence of their secretion in a pregnant woman.

(b) Mention their source and the function they perform :
hcG, LH, FSH, Relaxin

Concept: Pregnancy and Embryonic Development
Chapter: [1.03] Human Reproduction
[5]25 | attempt any one
[5]25.1

Work out a typical Mendelian dihybrid cross and state the law that he derived from it.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[5]25.2

How do the observations made during moth collection in pre- and post- industrialized era in England support evolution by Natural Selection?

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

Explain the phenomenon that is well represented by Darwin's finches other than natural selection.

Concept: Darwin'S Contribution
Chapter: [2.03] Evolution
[5]26 | attempt any one
[5]26.1

What is an age-pyramid?

Concept: Population - Population Attributes
Chapter: [5.01] Organisms and Populations

Represent diagrammatically three kinds of age-pyramids for human populations.

Concept: Population - Population Attributes
Chapter: [5.01] Organisms and Populations
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[5]26.2

Discuss the role of healthy ecosystem services as a pre-requisite for a wide range of economic, environmental and aesthetic goods and services

Concept: Ecosystem Services
Chapter: [5.02] Ecosystem
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