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Biology All India Set 1 2015-2016 CBSE (Arts) Class 12 Question Paper Solution

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Biology [All India Set 1]
Marks: 70Date: 2016-03-21
Duration: 3h

[1]1

A male honeybee has 16 chromosomes whereas its female has 32 chromosomes. Give one reason.

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[1]2

Mention the role of ‘genetic mother’ in MOET.

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]3

What is biopiracy?

Concept: Ethical Issues
Chapter: [4.02] Biotechnology and Its Application
[1]4

Mention two advantages for preferring CNG over diesel as an automobile fuel.

Concept: Air Pollution and Its Control - Introduction of Air Pollution and Its Control
Chapter: [5.04] Environmental Issues
[1]5

Write the probable differences in eating habits of Homo habilis and Homo erectus.

Concept: Origin and Evolution of Man
Chapter: [2.03] Evolution
[1]6

A single pea plant in your kitchen garden produces pods with viable seeds, but the individual papaya plant does not. Explain.

Concept: Elementary Idea of Polygenic Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[1]7

Following are the features of genetic codes. What does each one indicate?
Stop codon; Unambiguous codon; Degenerate codon; Universal codon.

Concept: Transcription - Introduction of Transcription
Chapter: [2.02] Molecular Basis of Inheritance
[1]8

Suggest four important steps to produce a disease resistant plant through conventional plant breeding technology.

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

Name a genus of baculovirus.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare

Why are baculovirus considered good bio-control agents?

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[2]10 | Attempt any one of the following
[2]10.1

Explain the relationship between CFC’s and Ozone in the stratosphere.

Concept: Ozone - Ozone Depletion in the Stratosphere
Chapter: [5.04] Environmental Issues
[2]10.2

Why are scared groves highly protected?

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[2]11 | Attempt any one of the following
[2]11.1

Name the organic material exine of the pollen grain is made up of. How is this material advantageous to pollen grain?

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [1.02] Sexual Reproduction in Flowering Plants

Still it is observed that it does not form a continuous layer around the pollen grain. Give reason.

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [1.02] Sexual Reproduction in Flowering Plants

How are ‘pollen banks’ useful?

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2]11.2

Mention the problems that are taken care of by Reproduction and Child Health Care programme.

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

What is amniocentesis and why there is a statutory ban on it?

Concept: Reproductive Health - Problems and Strategies
Chapter: [1.04] Reproductive Health [1.04] Reproductive Health
[2]12

What is a test cross?

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

How can test cross decipher the heterozygosity of a plant?

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[2]13

What do 'Y' and 'B' stand for in 'YAC' and 'BAC' used in Human Genome Project (HGP).

Mention their role in the project.

Concept: Human Genome Project
Chapter: [2.02] Molecular Basis of Inheritance

Write the percentage of the total human genome that codes for proteins and the percentage of discovered genes whose functions are known as observed during HGP.

Concept: Human Genome Project
Chapter: [2.02] Molecular Basis of Inheritance

Expand 'SNPs' identified by scientists in HGP

Concept: Human Genome Project
Chapter: [2.02] Molecular Basis of Inheritance
[2]14

Differentiate between homology and analogy. Give one example of each.

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[2]15

It is generally observed that the children who had suffered from chicken – pox in their childhood may not contract the same disease in their adulthood. Explain giving reasons the basics of such immunity in an individual. Name this kind of immunity.

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

What are interferons?

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

Mention role of interferons

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[2]16

Write the two limitations of traditional breeding technique that led to the promotion of micropropagation.

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production

Mention two advantages of micro propagation.

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production

Give two examples where micropropagation is commercially adopted

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]17

How do organic farmers control pests? Give two examples.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare

State the difference in organic farmers approach from that of conventional pest control methods.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[2]18

Name the selectable markers in the cloning vector pBR322? Mention the role they play.

Concept: Tools of Recombinant Dna Technology - Cloning Vectors
Chapter: [4.01] Biotechnology - Principles and Processes

Why is the coding sequence of an enzyme β - galactosidase a preferred selectable marker in comparison to the ones named above?

Concept: Tools of Recombinant Dna Technology - Cloning Vectors
Chapter: [4.01] Biotechnology - Principles and Processes
[3]19

Why must a cell be made ‘competent’ in biotechnology experiments? How does calcium ion help in doing so?

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

State the role of 'biolistic gun' in biotechnology experiments.

Concept: Tools of Recombinant Dna Technology - Competent Host (For Transformation with Recombinant Dna)
Chapter: [4.01] Biotechnology - Principles and Processes
[3]20

Explain enzyme – replacement therapy to treat adenosine deaminase deficiency. Mention two disadvantages of this procedure.

Concept: Biotechnological Applications in Medicine
Chapter: [4.02] Biotechnology and Its Application
[3]21

Name and explain the type of interaction that exists in mycorrhizae and between cattle egret and cattle.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[3]22

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

Concept: Ecological Succession
Chapter: [5.02] Ecosystem
[3]23

A large number of married couples the world over are childless. It is shocking to know that in India the female partner is often blamed for the couple being childless.
(a) Why in your opinion the female partner is often blamed for such situations in India? Mention any two values that you as a biology student can promote to check this social evil.
(b) State any two reasons responsible for the cause of infertility.
(c) Suggest a technique that can help the couple to have a child where the problem is with male partner

Concept: Infertility
Chapter: [1.04] Reproductive Health
[3]24 | Attempt any one of the following
[3]24.1

Explain the menstrual phase in a human female. State the levels of ovarian and pituitary hormones during this phase.

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction

Why is follicular phase in the menstrual cycle also referred as proliferative phase? Explain.

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction

Explain the events that occur in a graafian follicle at the time of ovulation and thereafter.

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction

Draw a graafian follicle and label antrum and secondary oocyte

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[3]24.2

As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure (s) that shall ensure cross – pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each of the item.

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

Draw a diagram of a section of a megasporangium of an angiosperm and label funiculus, Micropyle, embryosac and nuclleus.

Concept: Pre-fertilisation - Structures and Events - Pollination
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]25 | Attempt any one of the following
[3]25.1

Describe Meselson and Stahl’s experiment that was carried in 1958 on E.Coli. Write the conclusion they arrived at after the experiment.

Concept: Replication - The Experimental Proof
Chapter: [2.02] Molecular Basis of Inheritance
[3]25.2

Describe the process of transcription in bacteria

Concept: Transcription - Introduction of Transcription
Chapter: [2.02] Molecular Basis of Inheritance

Explain the processing the hnRNA needs to undergo before becoming functional mRNA eukaryotes.

Concept: Transcription - Introduction of Transcription
Chapter: [2.02] Molecular Basis of Inheritance
[3]26 | Attempt any one of the following
[3]26.1

(a) Name the two growth models that represent population growth and draw the respective growth curves they represent.

(b) State the basics for the difference in the shape of these curves

(c) Which one of the curves represents the human population growth at present? Do you think such a curve is sustainable? Give reason in support of your answer.

Concept: Population - Population Attributes
Chapter: [5.01] Organisms and Populations
[3]26.2

Taking an example of a small pond, explain how the four components of an ecosystem function as a unit.

Concept: Ecosystem – Structure and Function
Chapter: [5.02] Ecosystem

Name the type of food chain that exists in a pond.

Concept: Ecosystem – Structure and Function
Chapter: [5.02] Ecosystem

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