Board Paper of Class 12-Science 2012 Biology (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
Cucurbits and papaya plants bear staminate and pistillate flowers. Mention the categories they are put under separately on the basis of the type of flowers they bear. (1)
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- Question 2
A garden pea plant (A) produced inflated yellow pod, and another plant (B) of the same species produced constricted green pods. Identify the dominant traits.
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- Question 3
Write what do phytophagous insects feed on.
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- Question 4
What is the interaction called between Cuscuta and shoe flower bush? (1)
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- Question 5
When do the oogenesis and the spermatogenesis initiate in human females and males respectively? (1)
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- Question 6
How does smoking tobacco in human lead to oxygen deficiency in their body?
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- Question 7
State the significance of the study of fossils in evolution. (1)
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- Question 8
Name the following:
(a) The semi-dwarf variety of wheat is high-yielding and disease-resistant.
(b) Any one inter-specific hybrid mammal.
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