1. Mutation rates are affected by A. temperature B. X-rays C. gamma and beta radiation D. All of the above Ans: D
2. A dihybrid condition is A. tt Rr B. Tt rr C. tt rr D. Tt Rr Ans: A
3. In case of incomplete dominance the monohybrid ratio of phenotypes in F₂ generation is A. 1 : 2 : 1 B. 3 : 1 : 1 C. 9 : 3 : 3 : 1 D. 2 : 3 : 1 Ans: A
4. The number of autosomes in human female ovum is A. 11 B. 12 C. 22 D. 23 Ans: C
5. Which one of the following represents a test cross ? A. Ww × WW B. Ww × Ww C. Ww × ww D. WW × WW Ans: C
6. How many different kinds of gametes will be produced by aplant having the genotype AABbCC? A. Nine B. Two C. Three D. Four Ans: B
7. How many pairs of contrasting characters in pea pod were chosen by Mendel? A. 2 B. 3 C. 4 D. 7 Ans: D
8. From a cross AABb x aaBb, the genotypes AaBB : AaBb : Aabb : aabb will be obtained in the following ratio A. 1: 1 : 1 : 1 B. 1: 2 : 1 : 0 C. 0: 3 : 1 : 0 D. 1: 1 : 1 : 0 Ans: B
9. A nucleotide is formed of A. purine, pyrimidine and phosphate B. purine, sugar and phosphate C. nitrogenous bases, sugar and phosphate D. pyrimidine, sugar and phosphate Ans: C
10. The process of translation is A. ribosome synthesis B. protein synthesis C. DNA synthesis D. RNA synthesis Ans: B
11. Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it? A. Thymine, Uracil - Pyrimidines B. Uracil, Cytosine - Pyrimidines C. Guanine, Adenine - Purines D. Adenine, Thymine - Purines Ans: D
12. Ligase helps in A. removal of few genes B. translation C. inserting few genes in DNA D. bringing trans-version in chromosomes Ans: C
13. A nucleoside differs from a nucleotide in not having A. phosphate B. sugar C. nitrogen base D. phosphate and sugar Ans: A
14. Nucleotide arrangement in DNA can be seen by A. X-ray crystallography B. Electron microscope C. Ultra centrifuge D. Light microscope Ans: A
15. Scientific name of man is A. Canis familiaris B. Homo habilis C. Homo erectus D. Homo sapiens Ans: D
16. The primitive atmosphere of earth contained water vapours, hydrogen, ammonia and A. CO₂ B. O₂ C. N₂ D. CH₄ Ans: D
17. The book ‘Origin of Species’ is written by A. Aristotle B. Darwin C. Watson D. Lamarck Ans: B
18. Which was absent in the atmosphere at the time of origin of life ? A. NH₃ B. H₂ C. O₂ D. CH₄ Ans: C
19. Homologous organs are A. wings of insects and bat B. gills of fish and lungs of rabbit C. pectoral fins of fish and fore limbs of horse D. wings of gross hopper and crow Ans: C
20. The kind of evolution in which two species of different genealogy come to resemble one another closely, is termed as A. progressive evolution B. convergent evolution C. parallel evolution D. retrogressive evolution Ans: B
21. Which one is linked to evolution? A. Extinction B. Competition C. Variation D. Reproduction Ans: C
22. Genetic variation in a population arises due to A. Mutations only B. Recombination only C. Mutations as well as recombination D. Reproductive isolation and selection Ans: C
23. The first organisms were A. Chemoautotrophs B. Chemoheterotrophs C. Autotrophs D. Eukaryotes Ans: B
24. What was the most significant trend in evolution of modern man (Homo sapiens) from his ancestors ? A. Upright posture B. Shortening of jaws C. Binocular vision D. increasing brain capacity Ans: D
25. The factors which represent the contrasting pairs of characters are called A. dominant and recessive B. alleles C. homologous pairs D. determinants Ans: B
26. Who proved that DNA is basic genetic material? A. Griffith B. Watson C. Boveri and Sutton D. Hershey and Chase Ans: D
27. The two strands of DNA are held together by A. peptide bonds B. phosphodiesterase bonds C. hydrogen bonds D. S – S bonds Ans: C
28. According to special creation theory the earth is about A. 4000 yrs old B. 4.5 M yrs old C. 4.5 B yrs old D. 10000 yrs old Ans: A
29. Which of the following is not a part of Darwin’s theory of evolution? A. Genetic drift B. Natural selection C. Survival of the fittest D. Struggle for existence Ans: A
30. In Down's syndrome of a male child, the sex complement is A. XO B. XY C. XX D. XXY Ans: B