Q. No.The idea of mutations was brought forth by:
1.
Gregor Mendel, who worked on Pisum sativum
2.
Hardy Weinberg, who worked on allele frequencies in a population
3.
Charles Darwin, who observed a wide variety of organisms during sea voyages
4.
Hugo do Vries, who worked on evening primrose
Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements
Statements:
| (A) | Wings of butterflies and birds look alike and are the results of , evolution |
| (B) | Miller showed that CH4, H2, NH3, and , when exposed to electric discharge in a flask resulted in the formation of . |
| (C) | Vermiform appendix is a organ and an evidence pf evolution. |
| (D) | According to Darwin evolution took place due to and of the fittest. |
Options:
| 1. | (A) - (i) convergent, (B) - (ii) oxygen, (ii) nucleosides |
| 2. | (B) - (i) water vapour, (ii) amino acids, (C) - (i) rudimentary (ii) anatomical |
| 3. | (C) - (i) vestigial, (ii) anatomical, (D) - (i) mutations, (ii) multiplication |
| 4. | (D) - (i) small variations, (ii) survival, (A) - (i) convergent |
Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution:
| 1. | Production of 'Dolly', the sheep by cloning |
| 2. | Development of organs from 'stem' cells for organ transplantation |
| 3. | Development of transgenic animals |
| 4. | Prevalence of pesticide-resistant insects |
Which of the following is not true for a species:
| 1. | Members of a species can interbreed |
| 2. | Variations occur among members of a species |
| 3. | Gene flow does not occur between the populations of a species |
| 4. | Each species is reproductively isolated from every other species |
In present times, the origin of life is not possible from inorganic compounds due to:
1. Non-availability of raw material
2. High concentration of O2 in the atmosphere
3. Decrease in temperature
4. Excess of pollution
On Galapagos island, Darwin observed variation in beaks of birds (Darwin's finches) and he concluded:
1. Inter species variation
2. Intraspecies variation
3. Natural selection according to food
4. Inheritance of acquired characters
Diversification in plant life appeared:
1. Due to abrupt mutations
2. Suddenly on earth
3. By seed dispersal
4. Due to long periods of evolutionary changes
According to Oparin, which one of the following was not present in the primitive atmosphere of the earth?
1. Oxygen
2. Hydrogen
3. Water vapour
4. Methane
Industrial melanism is an example of:
| 1. | Natural selection | 2. | Mutation |
| 3. | Racial difference | 4. | Predation |
Which one of the following was obtained by S. Miller in his experiments on the origin of life before 1953:
1. Simple sugars
2. Amino acids
3. Nucleotide
4. Peptides
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