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

What does nature's carrying capacity for a species indicate?
VIEW SOLUTION

Question 2
Suggest a molecular diagnostic procedure that detects HIV in a suspected AIDS patient. VIEW SOLUTION

Question 3
Name two animals that exhibit Oestrus cycle. VIEW SOLUTION

Question 4
Mention one difference to distinguish an exon from an intron. VIEW SOLUTION

Question 5
What is a Mutagen? Name a physical factor that can be a Mutagen. VIEW SOLUTION

Question 6
How e-wastes are being handled in our country? Write the correct solution for treatire this waste. VIEW SOLUTION

Question 7
Suggest four advanced ex-situ methods to conserve threatened bio-diversity. VIEW SOLUTION

Question 8
State the role of Oxytocin in parturition. What triggers its release from the pituitary? VIEW SOLUTION

Question 9
(a) "Fortification of crops is the need of the hour." Give two reasons.

(b) Select one fresh-water and one marine fish from the following:

Prawn; Catla; Mackerel; Lobster VIEW SOLUTION

Question 10
How does a test cross help to determine the genotype of an individual?

Or

Mention two applications of DNA polymorphism. VIEW SOLUTION

Question 11
Explain with the help of an example the relationship between restriction endonuclease and a palindromic nucleotide sequence. VIEW SOLUTION

Question 12
Draw a labelled diagram of the embryonic stage that gets implanted in the human uterus. State the functions of the two parts labelled. VIEW SOLUTION

Question 13
(a) State Oparin-Haldane's hypothesis.

(b) How does S.L. Miller's experiment supports it? VIEW SOLUTION

Question 14
(a) Draw a labelled sketch of a mature 7-celled, 8-nucleate embryo-sac.

(b) Which one of the cell in an embryo-sac produce endosperm after double fertilization? VIEW SOLUTION

Question 15
Narrowly utilitarian arguments are put forth in support of biodiversity conservation.

Mention the other two arguments that are put forth in support of the same cause. VIEW SOLUTION

Question 16
Draw a pyramid of bio-mass and pyramid of energy in sea. Give your comments on the shape of pyramids drawn.

Or

(a) Rearrange the following greenhouse gases in increasing order of their relative contribution to the total global warming.

N₂O; CFC; CO₂; C₂H₄.

(b) What is the effect of global warming on polar ice-caps? Comment on its possible ecological impact. VIEW SOLUTION

Question 17
(a) What is Gene therapy?

(b) Describe the procedure of such a therapy that could be a permanent cure for a disease. Name the disease. VIEW SOLUTION

Question 18
Human blood group is a good example of multiple allelism and Co-dominance. Justify. VIEW SOLUTION

Question 19
You make a visit to a Hill station, one of your friend suddenly became unwell and felt uneasy.

(a) list two symptoms you would look for to term it to be due to allergen.
(b) Explain the response of the body to an allergen.
(c) Name two drugs that can be recommended for immediate relief. VIEW SOLUTION

Question 20
(a) A parasite has to adapt to be able to live in a host. Write the various parasitic adaptations.

(b) Mention an adaptive feature exhibited in brood parasitism in Koel and Crow. VIEW SOLUTION

Question 21
(a) Why did Hershey and Chase use radioactive sulfur and radioactive phosphorus in their experiment?

(b) Write the conclusion they arrived at and how. VIEW SOLUTION

Question 22
Why does the 'insertional inactivation' method to detect recombinant DNA is preferred to 'antibiotic resistance' procedure? VIEW SOLUTION

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