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Biology Delhi Set 1 2011-2012 CBSE (Science) Class 12 Question Paper Solution

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Biology
Delhi Set 1
2011-2012 March
Marks: 70

[1]1

Mention the unique flowering phenomenon exhibited by Strobilanthus kunthiana (neelakuranaji).

Concept: Modes of Reproduction
Chapter: [1.01] Reproduction in Organisms
[1]2

How does smoking tobacco in human lead to oxygen deficiency in their body?

Concept: Drugs and Alcohol Abuse - Adolescence - Drug and Alcohol Abuse
Chapter: [3.01] Human Health and Diseases
[1]3

A garden pea plant (A) produced inflated yellow pod, and another plant (B) of the same species produced constricted green pods. Identify the dominant traits.

Concept: Elementary Idea of Polygenic Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[1]4

Why is Eichhornia crassipes nicknamed as “Terror of Bengal”?

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

Write the location and function of the sertoli cells in humans.

Concept: Microscopic Anatomy of Testis
Chapter: [1.03] Human Reproduction
[1]6

Name the following: The semi-dwarf variety of wheat is high-yielding and disease-resistant.

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

Name the following:  Any one inter-specific hybrid mammal.

Concept: Introduction of Strategies for Enhancement in Food Production
Chapter: [3.02] Strategies for Enhancement in Food Production
[1]7

Write the similarity between the wing of a butterfly and the wing of a bat. What do you infer from the above with reference to evolution? 

Concept: Evidences for Evolution
Chapter: [2.03] Evolution
[1]8

Write what do phytophagous insects feed on.

Concept: Population - Population Interactions
Chapter: [5.01] Organisms and Populations
[2]9

Highlight the role of thymus as a lymphoid organ.

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

Name the cells that are released from the above-mentioned gland. Mention how they help in immunity.

Concept: Concept of Immunity
Chapter: [3.01] Human Health and Diseases
[2]10

Why do clown fish and sea anemone pair up? What is this relationship called?

Concept: Population - Population Interactions
Chapter: [5.01] Organisms and Populations
[2]11

Some organisms suspend their metabolic activities to survive in unfavourable conditions. Explain with the help of any four examples.

Concept: Post-fertilisation : Structures and Events - Endosperm
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2]12

State the role of DNA ligase in biotechnology.

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

What happens when Meloidegyne incognitia consumes cells with RNAi gene?

Concept: Biotechnological Applications in Agriculture
Chapter: [4.02] Biotechnology and Its Application
[2]13

Draw a schematic diagram of a part of double stranded dinucleotide DNA chain having all the four nitrogenous bases and showing the correct polarity.

Concept: Structure of DNA and RNA
Chapter: [2.02] Molecular Basis of Inheritance
[2]14

Name of parasite the causes filariasis in humans. Mention its two diagnostic symptoms. How is this transmitted to others?

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[2]15 | Attempt any one of the following
[2]15.1

Name the source of streptokinase. How does this bioreactor molecule function in our body?

Concept: Microbes in Industrial Production
Chapter: [3.03] Microbes in Human Welfare
[2]15.2

How do mycorrhizae act as biofertilizers? Explain.

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

Name a genus of fungi that forms a mycorrhizal association with plants.

Concept: Microbes as Biocontrol Agents
Chapter: [3.03] Microbes in Human Welfare
[2]16

State the difference between meiocyte and gamete with respect to chromosome number.

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

Why is a whiptail lizard referred to as parthenogenetic?

Concept: Sexual Reproduction - Fertilisation
Chapter: [1.01] Reproduction in Organisms
[2]17

Explain the work carried out by Cohen and Boyer that contributed immensely in biotechnology.

Concept: Principles of Biotechnology
Chapter: [4.01] Biotechnology - Principles and Processes
[2]18

Where is sporopollenin present in plants?

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

State the sporopollenin significance with reference to its chemical nature.

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]19 | Attempt any one of the following
[3]19.1

It is established that RNA is the first genetic material. Explain giving three reasons

Concept: Search for Genetic Material - Properties of Genetic Material (DNA Versus RNA)
Chapter: [2.02] Molecular Basis of Inheritance
[3]19.2

Name the enzyme responsible for the transcription of tRNA and the amino acid the initiator tRNA gets linked with.

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

Explain the role of initiator tRNA in the initiation of protein synthesis.

Concept: Transcription - Introduction of Transcription
Chapter: [2.02] Molecular Basis of Inheritance
[3]20

State the theory of Biogenesis. How does Miller’s experiment support this theory?

Concept: Origin of Life
Chapter: [2.03] Evolution
[3]21

Name the two different categories of microbes naturally occurring in sewage water.

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

Explain the role of microbes in cleaning sewage water into usable water.

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

Write the function of the following:- (Oviducal) Fimbriae

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

Write the function of the following:- Coleoptile

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

Write the function of the following:- Oxytocin

Concept: Post-fertilisation : Structures and Events - Embryo
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]23

Name the genes responsible for making Bt cotton plants resistant to bollworm attack. How do such plants attain resistance against bollworm attacks? Explain.

Concept: Biotechnological Applications in Agriculture
Chapter: [4.02] Biotechnology and Its Application
[3]24

Study a part of the life cycle of malarial parasite given below. Answer the questions that follow:

(a) Mention the roles of ‘A’ in the life cycle of the malarial parasite.

(b) Name the event ‘C’ and the organ where this event occurs.

(c) Identify the organ ‘B’ and name the cells being released from it.

Concept: Common Diseases in Humans
Chapter: [3.01] Human Health and Diseases
[3]25

Given below is the representation of amino acid composition not the relevant translated portion of β-chain of haemoglobin, related to the shape of human red blood cells

(a) Is this representation indicating a normal human or a sufferer from certain related genetic disease? Give reason in support of your answer.

(b) What difference would be noticed in the phenotype of the normal and the sufferer related to this gene?

(c) Who are likely to suffer more from the defect related to the gene represented the males, the females or both males and females equally? And why?

Concept: Genetic Disorders - Mendelian Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[3]26

By the end of 2002 the public transport of Delhi switched over to a new fuel. Name the fuel. Why is this fuel considered better? Explain.

Concept: Air Pollution and Its Control - Introduction of Air Pollution and Its Control
Chapter: [5.04] Environmental Issues
[3]27

Draw a schematic sketch of pBR 322 plasmid and label the following in it:

(a) Any two restriction sites.

(b) Ori and rop genes.

(c) An antibiotic resistant gene.

Concept: Tools of Recombinant Dna Technology - Cloning Vectors
Chapter: [4.01] Biotechnology - Principles and Processes
[5]28 | Attempt any one of the following
[5]28.1

Explain the carbon cycle with the help of a simplified model.

Concept: Nutrient Cycling
Chapter: [5.02] Ecosystem
[5]28.2

Explain how does a primary succession start on a bare rock and reach a climax community?

Concept: Ecological Succession
Chapter: [5.02] Ecosystem

Explain how does the algal bloom eventually choke the water body in an industrial area?

Concept: Water Pollution and Its Control - Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
[5]29 | Attempt any one of the following
[5]29.1

The following is the illustration of the sequence of ovarian events (a − i) in a human female

(i) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.

(ii) Name the ovarian hormone and the pituitary hormone that have caused the above mentioned event.

(iii) Explain the changes that occur in the uterus simultaneously in anticipation.

(iv) Write the difference between ‘c’ and ‘h’.

(v) Draw a labeled sketch of the structure of a human ovum prior to fertilization.

Concept: Gametogenesis
Chapter: [1.03] Human Reproduction
[5]29.2

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
[5]30 | Attempt any one of the following
[5]30.1

What is the inheritance pattern observed in the size of starch grains and seed shape of Pisum sativum? Workout the monohybrid cross showing the above traits. How does this pattern of inheritance deviate from that of Mendelian law of dominance?

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]30.2

State the aim and describe Messelson and Stahl’s experiment.

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

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