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Biology All India Set 2 2014-2015 CBSE (Science) Class 12 Question Paper Solution

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Biology [All India Set 2]
Marks: 70Date: 2014-2015 March

[1]1

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]2

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]3

State the cause of adenosine deaminase enzyme deficiency.

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[1]4

What is a cistron?

Concept: Transcription - Transcription Unit and the Gene
Chapter: [2.02] Molecular Basis of Inheritance
[1]5

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
[2]6 | Attempt any one of the following
[2]6.1

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]6.2

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]7

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]8

Explain the process of secondary treatment given to the primary effluent up to the point it shows significant change in the level of biological oxygen demand (BOD) it.

Concept: Microbes in Sewage Treatment
Chapter: [3.03] Microbes in Human Welfare
[2]9

(a) Select the analogous structures from the combination given below:

(i) Forelimbs of whales and bats

(ii) Eyes of octopus and mammals

(iii) Tuber of sweet potato and potato

(iv) Tuber of Bougainvillea and tendrils of Cucurbita

(b) State the kind of evolution they represent

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[2]10

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

Concept: Development of Male Gametophytes
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]11

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]12

Explain the significance of satellite DNA in DNA fingerprinting technique.

Concept: DNA Fingerprinting
Chapter: [2.02] Molecular Basis of Inheritance
[3]13

What does the following equation represent? Explain.

p2 + 2pq + q2 = 1

Concept: Hardy - Weinberg'S Principle
Chapter: [2.03] Evolution
[3]14

Two independent monohybrid crosses were carried out involving a tall pea plant with a dwarf pea plant. In the first cross, the offspring population has equal number of tall and dwarf plants, whereas in the second cross it was different. Work out the crosses and explain giving reasons for the difference in the offspring population.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[3]15

State what is apomixis. Comment on its significance. How can it be commercially used?

Concept: Apomixis And Polyembryony
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]16 | Attempt any one of the following
[3]16.1

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]16.2

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]17

Describe any three potential applications of genetically modified plants.

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

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]19

Explain co-evolution with reference to parasites and their hosts.

Concept: Adaptive Radiation
Chapter: [2.03] Evolution

Mention any four special adaptive evolved in parasites for their parasite mode of life.

Concept: Adaptive Radiation
Chapter: [2.03] Evolution
[3]20

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
[3]21

With the help of a flow-chart exhibit the events of eutrophication.

Concept: Water Pollution and Its Control - Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
[3]22

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

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[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
[4]24 | Attempt any one of the following
[4]24.1

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

Concept: Population and Ecological Adaptations
Chapter: [5.01] Organisms and Populations
[4]24.2

“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
[4]25 | Attempt any one of the following
[4]25.1

(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
[4]25.2

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

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[4]26
[4]26.1

Why are color-blindness and thalassaemia categorised as Mendelian disorders? Write the symptoms of these diseases seen in people suffering from them.

Concept: Genetic Disorders - Mendelian Disorders
Chapter: [2.01] Principles of Inheritance and Variation

About 8% of the human male population suffers from colour blindness, whereas only about 0.4% of the human female population suffers from this disease. Write an explanation to show how it is possible.

Concept: Genetic Disorders - Mendelian Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[4]26.2

Explain the process of transcription in prokaryotes.

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

How is Prokaryotic Transcription process different in eukaryotes?

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

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