Class X Science
Subject: Biology___Objective Question
Chapter 4: Heredity and Evolution
Q. 1. The F2 phenotype ratio of a monohybrid cross studied by Mendel is(A) 1:1
(B) 2:1
(C) 3:1
(D) 4:1
Right Ans:- 3:1
Q. 2. If T is for tallness and t for dwarfness, what shall be the genotype of a tall pea plant according to Mendelism?
(A) TT
(B) Tt
(C) Either TT or Tt
(D) tt
Right Ans:- Either TT or Tt
Q. 3. A Yellow and Round seeded pea plant has genotype YyRr. The gametes produced shall be
(A) Yy, Rr
(B) YR, yR, Yr, yr
(C) YR, yr
(D) YR, y
Right Ans:- YR, yR, Yr, yr
Q. 4. If in human a sperm (22+Y) fertilizes an egg (22+X), the sex of the foetus shall be
(A) Male
(B) Female
(C) Either male or Female
(D) both
Right Ans:- Male
Q. 5. Forelimb of frog, lizard, bird and man has some evolutionary relationship. This are
(A) Hand relationship
(B) Missing links
(C) Analogous organs
(D) Homologous organs
Right Ans:- Homologous organs
Q. 6. The number of autosomes in a human body cell is
(A) 44
(B) 46
(C) 22
(D) 23
Right Ans:- 44
Q. 7. The theory of Natural Selection was proposed by
(A) Lamarck
(B) Darwin
(C) Mendel
(D) Haldane
Right Ans:- Darwin
Q. 8. How life might have originated on earth was experimentally shown by
(A) Urey and Miller
(B) Oparin and Haldane
(C) Watson and Crick
(D) None of the above
Right Ans:- Urey and Miller
Q. 9. Surgically removing tails of mice over several generations’ do not yield mice without tails. This proves that
(A) Cutting tail does not cause genetic change. So it not inherited.
(B) Acquired characters during one’s own life are not inherited.
(C) Neither a nor b is correct
(D) Both a and b are correct
Right Ans:- Both a and b are correct
Q. 10. A random change in the frequency of alleles in any population over several generations due to errors in the gametes is called
(A) Gene flow
(B) Genetic Drift
(C) Genetic error
(D) Genetic crash
Right Ans:- Genetic Drift
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