Download Biology CBSE Guess Papers Class XII 2009
Guess Paper
Subject – Biology
Class – XII
(set-1)
Time: 3 Max.Marks 70
General Instructions:
1. All questions are compulsory.
2. This question paper consists of four Sections A, B, C and D. Section -A contains 8 questions of 1 mark each, Section -B is of 10 questions of 2 marks each, Section -C has 9 questions of 3 marks each and Section D is of 3 questions of 5 marks each.
3. There is no overall choice. However, an internal choice has been provided in one question of 2 marks, one question of 3 marks and all the three questions of 5 marks weight age. Attempt only one of the choices in such questions.
4. Wherever necessary, the diagrams drawn should be neat and properly labeled.
Section A
1. How many eggs do you think were released by the ovary of a female dog, which gave birth to six puppies? How many eggs do you think would have been released by a human mother, who gave birth to identical twins? Would your answer change if the twins were born fraternal? [1]
2. The diagram below shows a human egg and a human sperm.
[a] Why is the egg much larger than the sperm?
[b] What is the significance of the two-labeled parts? [1]
3. If the frequency of the parental form is higher than 25% in a dihybrid test cross, what does it indicate about the two genes involved? Name the condition and the person who coined the term for it. [1]
4. The gene for haemoglobin Hb has two codominant alleles: HbA (the normal gene) and HbS (the mutated gene). How many phenotypes it can show? Name the three phenotypes.
5 Why are some fruits called as false fruits? Look at fruit below and label the Parts. [1]
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