Board Paper of Class 12-Science 2008 Biology (SET 1) - Solutions
(i) All questions are compulsory.
(ii) This question paper consists of four Sections A, B, C and D. Section A contains 8 questions of one mark each, Section B is of 10 questions of two marks each, Section C is of 9 questions of three marks each and Section D is of 3 questions of five marks each.
(iii) There is no overall choice. However, an internal choice has been provided in one question of 2 marks, one question of 3 marks and two questions of 5 marks weightage. A student has to attempt only one of the alternatives in such questions.
(iv) Wherever necessary, the diagrams drawn should be neat and properly labelled.
- Question 1
What causes speciation according to Hugo de Vries?
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- Question 2
When and why do some animals such as frogs hibernate?
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- Question 3
List any two economically important products for humans obtained from Apis indica.
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- Question 4
Name the Indian variety of rice patented by an American company.
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- Question 5
What role do macrophages play in providing immunity to humans?
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- Question 6
- Question 7
Name the world’s most problematic aquatic weed. What is the nature of the water body in which the weeds grow abundantly?
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- Question 8
What is the major difference you observe in the offsprings produced by asexual reproduction and in the progeny produced by sexual reproduction?
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- Question 21
One of the codons on mRNA is AUG. Draw the structure of tRNA adapter molecule for this codon. Explain the uniqueness of this tRNA.
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- Question 24
Given below is a part of the template strand of a structural gene:
-
TAC
CAT
TAG
GAT
(a) Write its transcribed mRNA strand with its polarity.
(b) Explain the mechanism involved in initiation of transcription of this strand.
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- Question 27
Explain the pattern of inheritance of haemophilia in humans. Why is the possibility of a human female becoming haemophilic extremely rare? Explain.
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