Board Paper of Class 12-Science 2016 Biology (SET 2) - Solutions

General Instructions :
(i) There are a total of 26 questions and five sections in the question paper, All questions are compulsory.
(ii) Section A contains question number 1 to 5, Very Short Answer type questions of one mark each.
(iii) Section B contains question number 6 to 10, Short Answer type I questions of two marks each.
(iv) Section C contains question number 11 to 22, Short Answer type II questions of three marks each.
(v) Section D contains question number 23, Value Based Question of four marks.
(vi) Section E contains question number 24 to 26, Long Answer type questions of five marks each.
(vii) There is no overall choice in the question paper, however, an internal choice is provided in one question of two marks, one question of three marks and all three questions of five marks. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.

Question 1
Suggest a technique to a researcher who needs to separate fragments of DNA. VIEW SOLUTION

Question 2
State a difference between a gene and an allele. VIEW SOLUTION

Question 3
Give an example of a human disorder that is caused due to a single gene mutation. VIEW SOLUTION

Question 4
Suggest the breeding method most suitable for animals that are below average in milk productivity. VIEW SOLUTION

Question 5
Excessive nutrients in a fresh water body cause fish mortality. Give two reasons. VIEW SOLUTION

Question 6

Name the causative organism of the disease amoebiasis. List three symptoms of the disease.

Identify 'A', 'B', 'C' and 'D' in the given table.

Crop	Variety	Resistance to disease
$A$	Himgiri	Leaf rust
Cauliflower	Pusa Shubhra	$B$
Brassica	Pusa Swarnim	$C$
Cowpea	$D$	Bacterial blight

VIEW SOLUTION

Question 7
Discuss the role the enzyme DNA ligase plays during DNA replication. VIEW SOLUTION

Question 8
Explain the importance of syngamy and meiosis in a sexual life cycle of an organism. VIEW SOLUTION

Question 9
List the events that lead to biogas production from waste water whose BOD has been reduced significantly. VIEW SOLUTION

Question 10
Why the plants that inhabit a desert are not found in a mangrove? Give reasons. VIEW SOLUTION

Question 11
Describe the experiment that helped Louis Pasteur to dismiss the theory of spontaneous generation of life. VIEW SOLUTION

Question 12
Differentiate between somaclones and somatic hybrids. Give one example of each. VIEW SOLUTION

Question 13
Why is breast-feeding recommended during the initial period of an infant's growth? Give reasons. VIEW SOLUTION

Question 14
Suggest and describe a technique to obtain multiple copies of a gene of interest in vitro. VIEW SOLUTION

Question 15
What is a GMO? List any five possible advantages of a GMO to a farmer. VIEW SOLUTION

Question 16
Given below is a list of six micro-organisms. State their usefulness to humans.
(a) Nucleopolyhedrovirus
(b) Saccharomyces cerevisiae
(c) Monascus purpureus
(d) Trichoderma polysporum
(e) Penicillium notatum
(f) Propionibacterium sharmanii VIEW SOLUTION

Question 17
A couple with normal vision bear a colour blind child. Work out a cross to show how it is possible and mention the sex of the affected child. VIEW SOLUTION

Question 18
Prior to a sports event blood & urine samples of sports-persons are collected for drug tests.
(a) Why is there a need to conduct such tests?
(b) Name the drugs the authorities usually look for.
(c) Write the generic names of two plants from which these drugs are obtained. VIEW SOLUTION

Question 19
In certain seasons we sweat profusely while in some other season we shiver. Explain. VIEW SOLUTION

Question 20
"In a food-chain, a trophic level represents a functional level, not a species." Explain.

OR

(a) Name any two places where it is essential to install electrostatic precipitators. Why it is required to do so?
(b) Mention one limitation of the electrostatic precipitator. VIEW SOLUTION

Question 21
How has RNAi technique helped to prevent the infestation of roots in tobacco plants by a nematode Meloidegyne incognitia? VIEW SOLUTION

Question 22
Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross. VIEW SOLUTION

Question 26
List the criteria a molecule that can act as genetic material must fulfill. Which one of the criteria are best fulfilled by DNA or by RNA thus making one of them a better genetic material than the other? Explain.

OR

(a) Differentiate between analogy and homology giving one example each of plant and animal respectively.

(b) How are they considered as an evidence in support of evolution ? VIEW SOLUTION

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