CBSE (Commerce) Class 12CBSE
Share
Notifications

View all notifications

Biology Delhi Set 2 2013-2014 CBSE (Commerce) Class 12 Question Paper Solution

Login
Create free account


      Forgot password?
Biology
Delhi Set 2
2013-2014 March
Marks: 70

[1]1

State the cause of accelerated eutrophication

Concept: Water Pollution and Its Control - Introduction of Water Pollution and Its Control
Chapter: [5.04] Environmental Issues
[1]2

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]3

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]4

Name the two intermediate hosts which the human liver fluke depends on to complete its life cycle so as to facilitate parasitization of its primary host.

Concept: Population - Population Interactions
Chapter: [5.01] Organisms and Populations
[1]5

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]6

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]7

Mention how does DNA polymorphism arise in a population.

Concept: DNA Fingerprinting
Chapter: [2.02] Molecular Basis of Inheritance
[1]8

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

Concept: Asexual Reproduction
Chapter: [1.01] Reproduction in Organisms
[2]9

Name the organic materials exine and intine of an angiosperm pollen grains are made up of. Explain the role of exine.

Concept: Pre-fertilisation - Structures and Events - Stamen, Microsporangium and Pollen Grain
Chapter: [1.02] Sexual Reproduction in Flowering Plants
[2]10

(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]11 | Attempt 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

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]13

How can healthy potato plants be obtained from a desired potato variety which is viral infected? Explain.

 

 
Concept: Tissue Culture
Chapter: [3.02] Strategies for Enhancement in Food Production
[2]14

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
[2]15

What is biopiracy?

Concept: Ethical Issues
Chapter: [4.02] Biotechnology and Its Application

State the initiative taken by the Indian Parliament against bio-piracy?

Concept: Biosafety Issues
Chapter: [4.02] Biotechnology and Its Application
[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

Write the role of Ori and 'restriction' site in a cloning vector pBR322.

Concept: Tools of Recombinant Dna Technology - Cloning Vectors
Chapter: [4.01] Biotechnology - Principles and Processes
[3]19 | Attempt one of the following
[3]19.1

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]19.2

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]20

A cross between a normal couple resulted in a son who was haemophilic and a normal daughter. In course of time, when the daughter was married to a normal man, to their surprise, the grandson was also haemophilic.
(a) Represent this cross in the form of a pedigree chart. Give the genotypes of the daughter and her husband.
(b) Write the conclusion you draw of the inheritance pattern of this disease.

Concept: Inheritance of Two Genes - Linkage and Crossing Over
Chapter: [2.01] Principles of Inheritance and Variation
[3]21

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]22

Describe the structure of a seminiferous tubule.

Concept: The Male Reproductive System
Chapter: [1.03] Human Reproduction
[3]23

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
[3]24

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]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

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]27

(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
[5]28 | Attempt one of the following
[5]28.1

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]28.2

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]29 | Attempt one of the following
[5]29.1

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]29.2

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

Explain the ovarian and uterine events that occur during a menstrual cycle in a human female under the influence of pituitary and ovarian hormones respectively.

Concept: Menstrual Cycle
Chapter: [1.03] Human Reproduction
[5]30.2

Why does endosperm development precede embryo development in angiosperm seeds? State the role of endosperm in mature albuminous seeds.

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

Describe with the help of three labelled diagrams the different embryonic stages that include mature embryo of dicot plants.

Concept: Embryo Development Upto Blastocyst Formation
Chapter: [1.03] Human Reproduction

Request Question Paper

If you dont find a question paper, kindly write to us





      View All Requests

Submit Question Paper

Help us maintain new question papers on Shaalaa.com, so we can continue to help students




only jpg, png and pdf files

CBSE previous year question papers Class 12 Biology with solutions 2013 - 2014

     CBSE Class 12 Biology question paper solution is key to score more marks in final exams. Students who have used our past year paper solution have significantly improved in speed and boosted their confidence to solve any question in the examination. Our CBSE Class 12 Biology question paper 2014 serve as a catalyst to prepare for your Biology board examination.
     Previous year Question paper for CBSE Class 12 Biology-2014 is solved by experts. Solved question papers gives you the chance to check yourself after your mock test.
     By referring the question paper Solutions for Biology, you can scale your preparation level and work on your weak areas. It will also help the candidates in developing the time-management skills. Practice makes perfect, and there is no better way to practice than to attempt previous year question paper solutions of CBSE Class 12.

How CBSE Class 12 Question Paper solutions Help Students ?
• Question paper solutions for Biology will helps students to prepare for exam.
• Question paper with answer will boost students confidence in exam time and also give you an idea About the important questions and topics to be prepared for the board exam.
• For finding solution of question papers no need to refer so multiple sources like textbook or guides.
S
View in app×