THE BANGALORE MEDICAL COACHING CENTRE
Corporate office: Second Floor, 612, 80 Feet Road, Near Sony World Signal, 6th Block, Koramangala, Bengaluru,
Karnataka – 560095.
Class: II Year PUC Academic Year: 2025-26
Subject: Biology (36) Maximum Marks: 35
Time: 1.30 Hours No. of Questions: 25
I. Select the correct option from the given choices. 8 ×1 = 8
1. A cross between two tall plants resulted in tall and dwarf plants. What would be the genotypes of both the
parents?
a) TT and Tt b) Tt and Tt c) TT and TT d) tt and tt
2. Mendel’s work was rediscovered by three scientists in the year
a) 1865 b) 1900 c) 1910 d) 1920
3. What is the possible blood group of a offspring when both parents have AB blood group?
a) AB only b) A, B and AB c) A, B, AB and O d) A and B only
4. A couple has three daughters. What is the possibility of them having a son next time?
a) 0 % b) 25 % c) 50 % d) 100 %
5. In sickle cell anaemia Glutamic acid is replaced by
a) Valine b) Histidine c) Glutamate d) Aspartate
6. The two nucleotides of DNA are linked through 3 and 5 carbon of pentose sugar by
a) N- Glycosidic bond b) Phosphodiester bond c) H bond d) Phosphoester bond
7. The components of deoxyguanosine is
a) Guanine + Ribose b) Guanine + Deoxyribose
c) Guanine + Deoxyribose + Phosphate d) Guanine + Ribose + Phosphate
8. Statement I: In Bio-chemical analysis of the transforming principle only DNAase could not transform R
strain to S strain.
Statement II: This experiment proved that proteins and RNAase not the transforming principle
a) Both statement I and statement II are correct
b) Both statement I and statement II are incorrect
c) Statement I is correct but statement II is incorrect
d) Statement I is incorrect but statement II is correct
II. Fill in the blanks by choosing the appropriate word: 2 ×1 = 2
8. A nitrogenous base is linked to the OH of Carbon of pentose sugar by__________ Bond
9. The radioactive P was used to label ___________ of the viral particle in Hershey and Chase experiment.
III. Answer any THREE the following. Each question carries two marks. 3×2=6
11. What is incomplete dominance? Give an example.
12. What is codominance? Give an example.
13. State the law of segregation and law of independent assortment.
14. Mention the four nitrogenous bases present in RNA.
15. According to Griffith experiment why did the mice die when heat killed s strain and live r strain was injected into
mice.
16.Statement I: In Bio-chemical analysis of the transforming principle only DNAase could not transform R strain to S
strain.
Statement II: This experiment proved that proteins and RNAase not the transforming principle.
a) Both statement I and statement II are correct
b) Both statement I and statement II are incorrect
c) Statement I is correct but statement II is incorrect
d) Statement I is incorrect but statement II is correct
IV. Answer any THREE of the following. Each question carries 3 marks: 3 ×3 = 9
17. T H Mogan used Drosophila melanogaster for genetical experiments. Why?
18. Explain sex determination in humans.
19. Four children with four different blood groups are born to parents where the mother has blood group ‘A’ and
the father has blood group ‘B’. Work out the cross to show the genotypes of the parents and all four children.
20.Mention the location of N- glycosidic bond, Hydrogen bond & phosphoester bond present in DNA?
21. Identify the following :
a) Pyrimidine present both in DNA and RNA
b) Purines present in DNA and RNA
c) Chemical bond present between 2 nucleotides.
V. Answer any TWO following questions in 200-250 words each, wherever applicable: 5 ×2 = 10
22. A colour-bind father has a daughter with a normal vision. The daughter marries a man with a normal
vision. What is the probability of her children to be colour bind? Explain with the help of pedigree chart.
23. Write a note on sickle cell anemia.
24. Explain the experiment that gave the final proof for DNA as the genetic material.
25. Explain Griffith’s experiment to explain the ‘transforming principle’.
