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Biology All India Set 3 2014-2015 CBSE (Science) Class 12 Question Paper Solution

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Biology [All India Set 3]
Marks: 70Date: 2014-2015 March

[1]1

What is a cistron?

Concept: Transcription - Transcription Unit and the Gene
Chapter: [2.02] Molecular Basis of Inheritance
[1]2

How many chromosomes do drones of honey bees possess?

Concept: Inheritance of Two Genes - Chromosome Theory of Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[1]3

List two advantages of the use of unleaded petrol in automobiles as fuel.

Concept: Air Pollution and Its Control - Introduction of Air Pollution and Its Control
Chapter: [5.04] Environmental Issues
[1]4

Retroviruses have no DNA. However, the DNA of the infected host cell does possess viral DNA. How is it possible?

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
[1]5

Suggest any two possible treatments that can be given to a patient exhibiting adenosine deaminase deficiency.

Concept: Biotechnological Applications in Medicine
Chapter: [4.02] Biotechnology and Its Application
[2]6

Select two pairs from the following which exhibit divergent evolution. Give reasons for your answer.

(i) Forelimbs of cheetah and mammals

(ii) Flippers of dolphins and penguins

(iii) Wings of butterflies and birds

(iv) Forelimbs of whales and mammals

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[2]7

A liverwort plant is unable to complete its life cycle in a dry environment. State two reasons

Concept: Sexual Reproduction - Pre-fertilisation Events - Gametogenesis
Chapter: [1.01] Reproduction in Organisms
[2]8 | Attempt Any One
[2]8.1

What is mutualism?

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

Mention any two examples where the organisms involved are commercially exploited in agriculture.

Concept: Population - Population Interactions
Chapter: [5.01] Organisms and Populations
[2]8.2

List any four techniques where the principle of ex-situ conservation of biodiversity has been employed.

Concept: Biodiversity Conservation
Chapter: [5.03] Biodiversity and Its Conservation
[2]9

Why are the plants raised through micropropagation are termed as somaclones?

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

Mention two advantages of micropropagation technique.

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]10

Explain the function of “anaerobic sludge digester” in a sewage treatment plant.

Concept: Microbes in Sewage Treatment
Chapter: [3.03] Microbes in Human Welfare
[3]11

The F2 progeny of a monohybrid cross showed phenotypic and genotypic ratio as 1:2:1 unlike that the Mendel’s monohybrid F2 ratio. With the help of a suitable example, work out a cross and explain how it is possible.

Concept: Mendel’s Laws of Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[3]12

Why are some seeds referred to as apomictic seeds?

Concept: Apomixis And Polyembryony
Chapter: [1.02] Sexual Reproduction in Flowering Plants

Mention one advantage and one disadvantage to a farmer who uses them.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[3]13

A heavily bleeding and bruised road accident victim was brought to a nursing home. The doctor immediately gave him an injection to protect him against a deadly disease.

(a) Write what did the doctor inject into the patient’s body.

(b) How do you think this injection would protect the patient against the disease?

(c) Name the disease against which this injection was given and the kind of immunity it provides.

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[3]14

“A very small sample of tissue or even a drop of blood can help determine paternity”. Provide a scientific explanation to substantiate the statement.

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

What does the following equation represent? Explain.

p2 + 2pq + q2 = 1

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

Describe any three potential applications of genetically modified plants.

Concept: Biotechnological Applications in Agriculture
Chapter: [4.02] Biotechnology and Its Application
[3]17

How did an American Company, Eli Lilly use the knowledge of r-DNA technology to produce human insulin?

Concept: Biotechnological Applications in Medicine
Chapter: [4.02] Biotechnology and Its Application
[3]18

How do snails, seeds, bears, zooplanktons, fungi and bacteria adapt to conditions unfavourable for their survival?

Concept: Population and Ecological Adaptations
Chapter: [5.01] Organisms and Populations
[3]19

Enumerate any six essentials of good, effective Dairy Farm Management Practices.

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[3]20

With the help of a flow chart, show the phenomenon of biomagnifications of DDT in an aquatic food chain.

Concept: Energy Flow
Chapter: [5.02] Ecosystem
[3]21 | Attempt Any One
[3]21.1

State the medicinal value and the bioactive molecules produced by Streptococcus, Monascus and Trichoderma.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[3]21.2

What are methanogens?

Concept: Microbes in Production of Biogas
Chapter: [3.03] Microbes in Human Welfare

How do methanogens help to generate biogas?

Concept: Microbes in Production of Biogas
Chapter: [3.03] Microbes in Human Welfare
[3]22

Rearrange the following in the correct sequence to accomplish an important biological reaction:

(a) In vitro synthesis of copies of DNA of interest

(b) Chemically synthesized oligonucleotides

(c) Enzyme DNA-polymerase

(d) Complementary region of DNA

(e) Genomic DNA template

(f) Nucleotides provided

(g) Primers

(h) Thermostable DNA-polymerase (from Thermus aquaticus)

(i) Denaturation of ds-DNA

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
[4]23

Your school has been selected by the Department of Education to organize and host an interschool seminar on “Reproductive Health – Problems and Practices”. However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is “too embarrassing.” Put forth four arguments with appropriate reasons and explanation to justify the topic to be very essential and timely.

Concept: Reproductive Health (Questios)
Chapter: [1.04] Reproductive Health
[5]24 | Attempt Any One
[5]24.1

How are Mendelian inheritance, polygenic inheritance and pleiotropy different from each other?

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

Explain polygenic inheritance pattern with the help of a suitable example.

Concept: Elementary Idea of Polygenic Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[5]24.2

Draw a labelled diagram of a “replicating fork” showing the polarity.

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

Why does DNA replication occur within such "forks"?

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

Name two enzymes involved in the process of DNA replication along with their properties.

Concept: Replication - The Experimental Proof
Chapter: [2.02] Molecular Basis of Inheritance
[5]25 | Attempt Any One
[5]25.1

List the different attributes that a population has and not an individual organism.

Concept: Population and Ecological Adaptations
Chapter: [5.01] Organisms and Populations

What is population density?

Concept: Population and Ecological Adaptations
Chapter: [5.01] Organisms and Populations

Explain any three different ways the population density can be measured, with the help of an example each.

Concept: Population and Ecological Adaptations
Chapter: [5.01] Organisms and Populations
[5]25.2

“It is often said that the pyramid of energy is always upright. On the other hand, the pyramid of biomass can be both upright and inverted.” Explain with the help if examples and sketches.

Concept: Ecological Pyramids
Chapter: [5.02] Ecosystem
[5]26 | Attempt Any One
[5]26.1

(a) Plan an experiment and prepare a flow chart of the steps that you would follow to ensure that the seeds are formed only from the desired sets of pollen grains. Name the type of experiment that you carried out.

(b) Write the importance of such experiments

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[5]26.2

Describe the role of pituitary and ovarian hormones during the menstrual cycle in a human female.

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction

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