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Biology Delhi Set 1 2013-2014 CBSE (Science) Class 12 Question Paper Solution

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

[1]1

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

Concept: Asexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[1]2

What are 'true breeding lines' that are used to study inheritance pattern of traits in plants?

Concept: Deviations from Mendelism - Incomplete Dominance, Co-dominance, Multiple Alleles and Inheritance of Blood Groups, Pleiotropy
Chapter: [2.01] Principles of Inheritance and Variation
[1]3

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

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

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: [4.01] Biotechnology - Principles and Processes
[1]5

How is 'stratification' represented in a forest ecosystem?

Concept: Introduction and Types of Ecosystem
Chapter: [5.02] Ecosystem
[1]6

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

Concept: Organism and Its Environment - Responses to Abiotic Factors
Chapter: [5.01] Organisms and Populations
[1]7

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

Concept: Concept of Biodiversity
Chapter: [5.03] Biodiversity and Its Conservation
[1]8

State the cause of accelerated eutrophication

Concept: Water Pollution and Its Control - Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
[2]9

Why do algae and fungi shift to sexual mode of reproduction just before the onset of adverse conditions?

Concept: Asexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[2]10

A cross was carried out between two pea plants showing the contrasting traits of height of the plants. The result of the cross showed 50% parental characters.
(i) Work out the cross with the help of a Punnett square.
(ii) Name the type of the cross carried out.

Concept: Elementary Idea of Polygenic Inheritance
Chapter: [2.01] Principles of Inheritance and Variation
[2]11 | Attempt any one of the following
[2]11.1

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: [2.01] Principles of Inheritance and Variation
[2]11.2

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 - Sex Determination in Humans
Chapter: [2.01] Principles of Inheritance and Variation
[2]12

(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: Transcription - Introduction of Transcription
Chapter: [2.02] Molecular Basis of Inheritance
[2]13

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

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]14

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

Concept: Tools of Recombinant Dna Technology - Restriction Enzymes
Chapter: [4.01] Biotechnology - Principles and Processes
[2]15

State how has Agrobacterium tumifaciens been made a useful cloning vector to transfer DNA to plant cells.

Concept: Tools of Recombinant Dna Technology - Cloning Vectors
Chapter: [4.01] Biotechnology - Principles and Processes
[2]16

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

Concept: Population - Population Attributes
Chapter: [5.01] Organisms and Populations
[2]17

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

Concept: Population - Population Interactions
Chapter: [5.01] Organisms and Populations
[2]18

How are 'sticky ends' formed on a DNA strand? Why are they so called? 

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

Explain any three advantages that seeds offer to angiosperms.

Concept: Apomixis And Polyembryony
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[3]20

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

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[3]21 | Attempt any one of the following
[3]21.1

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 - Mendelian Disorders
Chapter: [2.01] Principles of Inheritance and Variation
[3]21.2

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: [2.01] Principles of Inheritance and Variation
[3]22

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
Chapter: [1.03] Human Reproduction
[3]23

(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: [3.02] Strategies for Enhancement in Food Production
[3]24

Why are beehives kept in a crop field during flowering period? Name any two crop fields where this is practised.

Concept: Animal Husbandry
Chapter: [3.02] Strategies for Enhancement in Food Production
[3]25

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: [4.02] Biotechnology and Its Application
[3]26

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: [5.01] Organisms and Populations
[3]27

What is primary productivity?

Concept: Productivity
Chapter: [5.02] Ecosystem

Why does primary productivity vary in different types of ecosystems?

Concept: Productivity
Chapter: [5.02] Ecosystem

State the relation between gross and net primary productivity.

Concept: Productivity
Chapter: [5.02] Ecosystem
[5]28 | Attempt any one of the following
[5]28.1

(a) Coconut palm is monoecious, while date palm is dioecious. Why are they so called?

Concept: Sexual Reproduction - Pre-fertilisation Events - Gametogenesis
Chapter: [1.01] Reproduction in Organisms

Draw a labelled diagram of sectional view of a mature embryo sac of an angiosperm.

Concept: Post-fertilisation : Structures and Events - Embryo
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[5]28.2

How is 'oogenesis' markedly different from 'spermatogenesis' with respect to the growth till puberty in the humans?

Concept: Gametogenesis
Chapter: [1.03] Human Reproduction

Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.

Concept: Gametogenesis
Chapter: [1.03] Human Reproduction
[5]29 | Attempt any one of the following
[5]29.1

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

Concept: Replication - The Experimental Proof
Chapter: [2.02] 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: Replication - The Experimental Proof
Chapter: [2.02] Molecular Basis of Inheritance
[5]29.2

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

Concept: Darwin'S Contribution
Chapter: [2.03] Evolution

State the two key concept of Darwinian theory.

Concept: Darwin'S Contribution
Chapter: [2.03] Evolution

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

Concept: Origin and Evolution of Man
Chapter: [2.03] Evolution
[5]30 | Attempt any one of the following
[5]30.1

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: [3.02] Strategies for Enhancement in Food Production

How are somatic hybrids obtained?

Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production
[5]30.2

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

Concept: Concept of Cancer
Chapter: [3.01] 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: AIDS
Chapter: [3.01] Human Health and Diseases

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

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

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

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

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