Q. No.The best description of natural selection is
1.
the survival of the fittest
2.
the struggle for existence
3.
the reproductive success of the members of a population best adapted to the environment
4.
a change in the proportion of variation within a population
Reproduction isolation in sympatric speciation develops without a
| 1. | Geographic barrier |
| 2. | Barrier to gene flow |
| 3. | Change in chromosome number |
| 4. | Barrier to mating |
Which of the following sets do not have homologous organs?
| 1. | Mouth parts of cockroach and butterfly |
| 2. | Wings of butterfly and bird |
| 3. | Wings of mosquito and butterfly |
| 4. | Forelegs of horse and paddles of whale |
Which of the following is the relatively most accurate method for dating fossils?
(1) Pottasium-argon method
(2) Uranium-lead method
(3) Electron-spin resonance method
(4) Radio-carbon method
At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygotes in a randomly mating population of equilibrium ?
(1) 0.16
(2) 0.36
(3) 0.48
(4) 0.24
Speciation of sympatric species is due to
| 1. | geographic isolation |
| 2. | reproductive isolation |
| 3. | isolation/separation |
| 4. | migration |
Flame cells and Malpighian tubules are the analogous organ in
| 1. | insects and arthropods respectively |
| 2. | arthropods and echinodermates respectively |
| 3. | helminths and arthropods with other insect respectively |
| 4. | arthropds and other insect with helminths respectively |
Tendrils in plants are an exapmle of
1. Convergent evolution
2. Radiation
3. Divergent evolution
4. Co-evolution
Theory of 'Saltations' was given by
| 1. | G Mendel | 2. | Hugo de Vries |
| 3. | J B S Haldane | 4. | H J Miller |
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