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Biology Delhi Set 3 2013-2014 CBSE (Arts) Class 12 Question Paper Solution

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Biology [Delhi Set 3]
Marks: 70 Academic Year: 2013-2014
Date: March 2014
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[1] 1

Mention the type of host cells suitable for the gene guns to introduce an alien DNA.

Concept: Tools of Recombinant Dna Technology - Competent Host (For Transformation with Recombinant Dna)
Chapter: [0.01] Biotechnology - Principles and Processes
[1] 2

Name any two types of cells that act as 'cellular barriers' to provide innate immunity in humans.

Concept: Immunity
Chapter: [0.01] Human Health and Diseases
[1] 3

How is repetitive/satellite DNA separated from bulk genomic DNA for various genetic experiments?

 

Concept: DNA Fingerprinting Technique
Chapter: [0.02] Molecular Basis of Inheritance
[1] 4

Write the name of the organism that is referred to as the 'Terror of Bengal'.

Concept: Asexual Reproduction
Chapter: [0.01] Reproduction in Organisms
[1] 5

Name the greenhouse gases that contribute to global warming.

 

 
Concept: Greenhouse Effect and Climate Change
Chapter: [0.04] Environmental Issues
[1] 6

Identify 'a' and 'b' in the figure given below representing proportionate number of major vertebrate taxa.

Concept: Biodiversity
Chapter: [0.03] Biodiversity and Its Conservation
[1] 7

Give an example of an organism that enters 'diapause' and why.

Concept: Organism and Its Environment - Responses to Abiotic Factors
Chapter: [0.01] Organisms and Populations
[1] 8

How is 'stratification' represented in a forest ecosystem?

Concept: Introduction and Types of Ecosystem
Chapter: [0.02] Ecosystem
[2] 9

(i) Name the scientist who suggested that the genetic code should be made of a combination of three nucleotides.
(ii) Explain the basis on which he arrived at this conclusion.

Concept: Protein synthesis - Transcription - Introduction of Transcription
Chapter: [0.02] Molecular Basis of Inheritance
[2] 10

State the disadvantage of inbreeding among cattle. How it can be overcome?

Concept: Animal Husbandry (Livestock)
Chapter: [0.02] Strategies for Enhancement in Food Production
[2] 11

Explain with the help of a suitable example the naming of a restriction endonuclease.

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [0.01] Biotechnology - Principles and Processes
[2] 12

What is gene therapy? Name the first clinical case in which it was used.

 

 
Concept: Biotechnological Applications in Medicine
Chapter: [0.02] Biotechnology and Its Application
[2] 13

Apart from being a part of the food chain, predators play other important roles. Mention any two such roles supported by examples.

Concept: Population Interactions
Chapter: [0.01] Organisms and Populations
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[2] 14

Construct an age pyramid which reflects a stable growth status of human population.

Concept: Population - Population Attributes
Chapter: [0.01] Organisms and Populations
[2] 15

Why does Bt toxin not kill the bacterium that produces it, but kill the insect that ingests it?

 

Concept: Biotechnological Applications in Medicine
Chapter: [0.02] Biotechnology and Its Application
[2] 16 | Attempt one of the following
[2] 16.1

How does the gene 'I' control ABO blood groups in humans ? Write the effect the gene has on the structure of red blood cells.

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [0.01] Principles of Inheritance and Variation
[2] 16.2

Write the types of sex-determination mechanisms the following crosses show. Give an example of each type.
(i) Female XX with Male XO
(ii) Female ZW with Male ZZ

Concept: Sex Determination
Chapter: [0.01] Principles of Inheritance and Variation
[2] 17

Identify the following pairs as homologous and analogous organs:
(i) Sweet potato and potato
(ii) Eye of octopus and eye of mammals
(iii) Thorns of Bougainvillaea and tendrils of Cucurbits
(iv) Fore limbs of bat and whale

Concept: Evidence of Organic Evolution
Chapter: [0.03] Evolution
[2] 18

List the post-fertilisation events in angiosperms.

 

 
Concept: Sexual Reproduction - Post-fertilisation Events - the Zygote
Chapter: [0.01] Reproduction in Organisms
[3] 19

Study the graph given below and answer the questions that follow :

(i) Write the status of food and space in the curves (a) and (b).
(ii) In the absence of predators, which one of the two curves would appropriately depict the prey population?
(iii) Time has been shown on X-axis and there is a parallel dotted line above it. Give the significance of this dotted line

Concept: Population - Population Attributes
Chapter: [0.01] Organisms and Populations
[3] 20

How did the process of RNA interference help to control the nematode from infecting the roots of tobacco plants?

Concept: Biotechnological Applications in Agriculture
Chapter: [0.02] Biotechnology and Its Application
[3] 21

What are methanogens?

Concept: Microbes in Production of Biogas
Chapter: [0.03] Microbes in Human Welfare

Name the animals in which methanogens occur and the role they play there.

Concept: Microbes in Production of Biogas
Chapter: [0.03] Microbes in Human Welfare
[3] 22

(a) Name the tropical sugar cane variety grown in South India. How has it helped in improving the sugar cane quality grown in North India?
(b) Identify 'a', 'b' and 'c' in the following table:

No. Crop Variety Insect Pests
1. Brassica Pusa Gaurav    (a)   
2. Flat bean Pusa Sem 2
Pusa sem 3
   (b)  
 
3.    (c)   Pusa Sawani
Pusa A-4
Shoot and fruit borer
Concept: Plant Breeding
Chapter: [0.02] Strategies for Enhancement in Food Production
[3] 23

Women are often blamed for producing female children. Consequently, they are ill-treated and ostracised. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?

Concept: Gametogenesis in Animal
Chapter: [0.03] Human Reproduction
[3] 24 | Attempt one of the following
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[3] 24.1

A colour-blind child is born to a normal couple. Work out a cross to show how it is possible. Mention the sex of this child.

Concept: Genetic Disorders
Chapter: [0.01] Principles of Inheritance and Variation [0.01] Principles of Inheritance and Variation
[3] 24.2

Mendel published his work on inheritance of characters in 1865, but it remained unrecognised till 1900. Give three reasons for the delay in accepting his work.

Concept: Mendel’s Laws of Inheritance
Chapter: [0.01] Principles of Inheritance and Variation [0.01] Principles of Inheritance and Variation
[3] 25

Name and explain the role of the inner and middle walls of the human uterus.

Concept: Menstrual Cycle (Ovarian Cycle)
Chapter: [0.03] Human Reproduction
[3] 26

Explain any three advantages that seeds offer to angiosperms.

Concept: Polyembryony
Chapter: [0.02] Sexual Reproduction in Flowering Plants
[3] 27

There are many animals that have become extinct in the wild but continue to be maintained in Zoological parks.
(i) What type of biodiversity conservation is observed in this case?
(ii) Explain any other two ways which help in this type of conservation.

Concept: Conservation of Biodiversity
Chapter: [0.03] Biodiversity and Its Conservation
[5] 28 | Attempt one of the following
[5] 28.1

Name the technology that has helped scientists to propagate on a large scale the desired crops in a short duration. List the steps carried out to propagate the crops by the said technique.

Concept: Tissue Culture
Chapter: [0.02] Strategies for Enhancement in Food Production

How are somatic hybrids obtained?

Concept: Tissue Culture
Chapter: [0.02] Strategies for Enhancement in Food Production
[5] 28.2

Cancer is one of the most dreaded diseases. Explain 'Contact inhibition' and 'Metastasis' with respect to the disease

Concept: Cancer
Chapter: [0.01] Human Health and Diseases

Name the group of genes that have been identified in normal cells that could lead to cancer. How do these genes cause cancer?

Concept: Sexually Transmitted Diseases (STD)
Chapter: [0.01] Human Health and Diseases [0.04] Reproductive Health

Name any two techniques that are useful in detecting cancers of internal organs.

Concept: Cancer
Chapter: [0.01] Human Health and Diseases

Why are cancer patients often given α-interferon as part of the treatment?

Concept: Cancer
Chapter: [0.01] Human Health and Diseases
[5] 29 | Attempt one of the following
[5] 29.1

With the help of a neat, labelled diagram describe the human male reproductive system.

Concept: Human Reproductive System - Male Reproductive System
Chapter: [0.03] Human Reproduction

Differentiate between Vas deferens and vasa efferentia.

Concept: Human Reproductive System - Male Reproductive System
Chapter: [0.03] Human Reproduction

Differentiate between Spermatogenesis and spermiogenesis.

Concept: Human Reproductive System - Male Reproductive System
Chapter: [0.03] Human Reproduction
[5] 29.2

What is double fertilisation? Describe the process in brief.

Concept: Double Fertilization in Plants
Chapter: [0.02] Sexual Reproduction in Flowering Plants

Draw a labelled diagram of a typical anatropous ovule.

Concept: Pre-fertilization in Plant: Structure and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [0.02] Sexual Reproduction in Flowering Plants
[5] 30 | Attempt one of the following
[5] 30.1

Explain the process of DNA replication with the help of a schematic diagram.

Concept: DNA Replication - The Experimental Proof
Chapter: [0.02] Molecular Basis of Inheritance

In which phase of the cell cycle does replication occur in Eukaryotes? What would happen if cell-division is not followed after DNA replication.

Concept: DNA Replication - The Experimental Proof
Chapter: [0.02] Molecular Basis of Inheritance
[5] 30.2

Explain Darwinian theory of evolution with the help of one suitable example.

Concept: Theories of Evolution: Darwinism or Theory of Natural Selection
Chapter: [0.03] Evolution

Mention any three characteristics of Neanderthal man that lived in near east and central Asia.

Concept: Human Evolution
Chapter: [0.03] Evolution

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