M.E.
S INDIAN SCHOOL, DOHA - QATAR
Worksheet -5, 2025- 2026
Section : BOYS’ & GIRLS’ Date:17-5-2025
Class & Div. : XII (All Divisions) Subject: BIOLOGY
Lesson / Topic: CH-6 Evolution
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
1. The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because
(a) one organism has given rise to another
(b) they share a common ancestor
(c) they perform the same function.
(d) they have biochemical similarities.
2. Analogous organs arise due to
(a) divergent evolution
(b) artificial selection
(c) genetic drift
(d) convergent evolution.
3. (p+q)2 = p2 + 2pq + q2 = 1 represents an equation used in
(a) population genetics
(b) Mendelian genetics
(c) biometrics
(d) molecular genetics.
4. Which type of selection is industrial melanism observed in moth, Biston betularia?
(a) Stabilising
(b) Directional
(c) Disruptive
(d) Artificial
5. Who proposed that the first form of the could have come from pre-existing non-living organic
molecules?
(a) S.L. Miller
(b) Oparin and Haldane
(c) Charles Darwin
(d) Alfred Wallace
6. Identify the correct arrangement of periods of Palaeozoic era in ascending order in geological time
scale.
(a) Cambrian → Devonian → Ordovician → Silurian → Carboniferous → Permian
(b) Cambrian → Ordovician → Silurian → Devonian→Carboniferous → Permian
(c) Cambrian → Ordovician → Devonian → Silurian → Carboniferous → Permian
(d) Silurian → Devonian → Cambrian → Ordovician → Permian → Carboniferous
7. Which is the correct order of increasing geological time scale for a hypothetical vertebrate
evolution?
(a) Cenozoic, Mesozoic, Palaeozoic, Proterozoic
(b) Cenozoic, Palaeozoic, Mesozoic, Proterozoic
(c) Proterozoic, Cenozoic, Palaezoic, Mesozoic
(d) Proterozoic, Palaeozoic, Mesozoic, Cenozoic
F 061, Rev 01, dtd 10th March 2020 1|Page
8. The brain capacity of Homo erects was about
(a) 650 c.c.
(b) 900 c.c.
(c) 1500 c.c.
(d) 1400 c.c.
9. Phenomenon of ‘industrial melanism’ demonstrates
(a) geographical isolation
(b) reproductive isolation
(c) natural selection
(d) induced mutation.
10. Which one of the following phenomena supports Darwin’s concept of natural selection in organic
evolution?
(a) Development of transgenic animals
(b) Production of “Dolly’, the sheep by cloning
(c) Prevalence of pesticide resistant insects
(d) Development of organs from ‘stem cells’ for organ transplantation.
11. Which one of the following scientist’s names is correctly matched with the theory put forth by
him?
(a) de Vries – Theory of natural selection
(b) Darwin – Theory of pangenesis
(c) Weismann – Theory of continuity of germplasm
(d) Pasteur – Theory of inheritance of acquired characters
12. At a particular locus, frequency of allele A is 0.6 and that of allele a is 0.4.
What would be the frequency of heterozygotes in a random mating population at equilibrium?
(a) 0.36
(b) 0.16
(c) 0.24
(d) 0.48
Question No. 13 to 15 consist of two statements – Assertion (A) and Reason (R). Answer these
questions selecting the appropriate option given below:
A. Both A and R are true, and R is the correct explanation of A.
B. Both A and R are true, and R is not the correct explanation of A.
C. A is true, but R is false. e
D. A is False, but R is true
13. Assertion(A): Whales, bats, cheetah and human share similarities in the pattern of bones of
forelimb.
Reason(R): All of them have humerus, radius, ulna, carpals, metacarpals and phalanges.
14. Assertion(A): According to Hardy-Weinberg principle, allele frequencies in a population are
stable and is constant from generation to generations.
Reason(R): Disturbance in genetic equilibrium or Hardy-Weinberg equilibrium would be
interpreted as resulting in evolution
15. Assertion(A): Theory of chemical evolution proposed that life comes from pre-existing nonliving
organic molecules.
Reason (R ): The primitive earth conditions led to production of organic molecules.
********************************THE END****************************************
F 061, Rev 01, dtd 10th March 2020 2|Page
