12th class (Fsc) Biology unit 10 MCQs
26. The armored mammal that lives only in America is the:
a. Echidna
b. Armadillo
c. Porcupine
d. Penguin
27. Interestrial vertebrates, the gill pouches develop into:
a. Nose
b. Gills
c. Eustachian tube
d. Lungs
28. A group of individuals belong to a particular species and sharing a common geographic area is called:
a. Ecosystem
b. Community
c. Biosphere
d. Population
29. A gene pool consists of:
a. The entire genome of a reproducing individual
b. All the alleles exposed to natural selection
c. The frequencies of the alleles for a gene locus within a population
d. The total of all alleles present in a population
30. In a population with two alleles for a particular locus, B and b, the alleles frequency of B is 0.7. What would be the frequency of heterozygote if the population is in Hardy-Weinberg equilibrium?
a. 0.49
b. 0.7
c. 0.09
d. 0.42
31. In a population that is in Hardy-Weinberg equilibrium 16% of the individual show the recessive trait. What is the frequency of the dominant allele in the population?
a. 0.6
b. 0.84
c. 0.4
d. 0.36
32. Selection acts directly on:
a. The entire genome
b. Phenotype
c. Each allel
d. Genotype
33. The ultimate source of changes is:
a. Genetic drift
b. Evolution
c. Migration
d. Mutation
34. In natural selection the environment plays role affecting the proportions of gene in:
a. Area
b. Population
c. Biome
d. Community
35. Some individuals leave behind more progeny than others and the rate at which they do so is affected by their inherited characteristics this is called:
a. Migration
b. Non random mating
c. Mutation
d. Selection
36. The change in frequency of alleles at locus that occur by chance is called:
a. Genetic drift
b. Mutation
c. Selection
d. Migration
37. Hardy – Weinberg’s theorem describes the frequencies of genotype of non-evolving:
a. Species
b. Family
c. Community
d. Population
38. Endangered species of plants have been recorded to more than:
a. 500
b. 300
c. 600
d. 400
39. In Pakistan among the animals declared extinct is:
a. Crocodile
b. White headed duck
c. Houbara Bustard
d. Marbled teal
40. Which one of the following is endangered in Pakistan:
a. Cheer pheasant
b. Indian rhino
c. Tiger
d. Indus dolphin
41. Zoos and botanical gardens are to save species whose extinction is ………:
a. Imminent
b. Permanent
c. Prominent
d. Dominant
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