Board Paper of Class 12-Science 2012 Biology All India(SET 2) - 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
How do the pollen grains of Vallisneria protect themselves? (1)
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- Question 3
Write the name of the following: (1)
(a) The most common species of bees suitable for apiculture
(b) An improved breed of chicken
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- Question 4
Mention the role of cyanobacteria as a biofertiliser. (1)
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- Question 5
How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans? (1)
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- Question 6
Where is acrosome present in humans? Write its function. (1)
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- Question 7
State the significance of Coelacanth in evolution. (1)
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- Question 8
Why is it desirable to use unleaded petrol in vehicles fitted with catalytic converters? (1)
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