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Biology Delhi Set 3 2016-2017 CBSE (Science) Class 12 Question Paper Solution

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Biology [Delhi Set 3]
Marks: 70Date: 2017-04-04
Duration: 3h

[1]1

What is biopiracy?

Concept: Ethical Issues
Chapter: [4.02] Biotechnology and Its Application
[1]2

Suggest a method to ensure an anamnestic response in humans.

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[1]3

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]4

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]5

Rearrange the human activities mentioned below as per the order in which they developed after the modern Homo sapiens came into existence during ice age:

(i) Human settlement
(ii) Prehistoric cave art
(iii) Agriculture

Concept: Origin of Life
Chapter: [2.03] Evolution
[2]6

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: Water Pollution and Its Control - Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
[2]7

How do mycorrhizae help the plants to grow better?  

Concept: Population - Life History Variation
Chapter: [5.01] Organisms and Populations
[2]8

Mention the ploidy of the different types of cells present in the female gametophyte of an angiosperm.

Concept: Sexual Reproduction - Pre-fertilisation Events - Gametogenesis
Chapter: [1.01] Reproduction in Organisms
[2]9 | Attempt any one
[2]9.1

Describe the structure of a nucleosome.

Concept: The DNA - Packaging of Dna Helix
Chapter: [2.02] Molecular Basis of Inheritance
[2]9.2

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
[2]10

"Growing Spirulina on a large scale is beneficial both environmentally and nutritionally for humans," Justify.

Concept: Single Cell Protein (SCP)
Chapter: [3.02] Strategies for Enhancement in Food Production
[3]11

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]12

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]13

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]14

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]15

Describe the structure of a seminiferous tubule.

Concept: The Male Reproductive System
Chapter: [1.03] Human Reproduction
[3]16

Parthenocarpy and apomixis have been observed in some plants. Give an example of each.

Concept: Post-fertilisation : Structures and Events - Seed
Chapter: [1.02] Sexual Reproduction in Flowering Plants

State a similarity and a difference observed between Parthenocarpy and apomixis.

Concept: Post-fertilisation : Structures and Events - Seed
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]17

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

Concept: Microbes in Sewage Treatment
Chapter: [3.03] Microbes in Human Welfare
[3]18

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]19

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]20

Show with the help of a flow chart only, the life cycle of malarial parasite in humans.

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[3]21 | Attempt any one
[3]21.1

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

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[3]21.2

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

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[3]22

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
[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

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]24.2

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]25 | Attempt any one
[5]25.1

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
[5]25.2

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
[5]26 | Attempt any one
[5]26.1

A capsicum flower has 240 ovules in its ovary. But, it produces a fruit with only 180 viable seeds.
 

Explain giving a reason that could be responsible for such a result.
Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants

Describe the development of an endosperm in a viable seed. Why does endosperm development precedes embryo development?

Concept: Post-fertilisation : Structures and Events - Endosperm
Chapter: [1.02] Sexual Reproduction in Flowering Plants

Give an example of an angiosperm seed that has a perisperm. Name the part the perisperm develops from.

Concept: Flower – a Fascinating Organ of Angiosperms
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[5]26.2

Where in the fallopian tube does fertilization occur in humans?

Concept: The Female Reproductive System
Chapter: [1.03] Human Reproduction

Describe the development of a fertilized ovum upto implantation.

Concept: The Female Reproductive System
Chapter: [1.03] Human Reproduction

How is polyspermy prevented in humans?

Concept: Fertilisation and Implantation
Chapter: [1.03] Human Reproduction

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