Q. No.Adaptive radiation refers to:
1.
adaptations due to geographical isolation
2.
evolution of different species from a common ancestor
3.
migration of members of a species to different geographical areas
4.
power of adaptation in an individual to a variety of environments
When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed:
1. divergent evolution
2. microevolution
3. co-evolution
4. convergent evolution
An important evidence in favour of organic evolution is the occurrence of:
1. homologous and vestigial organs
2. analogous and vestigial organs
3. homologous organ only
4. analogous organ only
Variations caused by mutation, as proposed by Hugo de Vries, are:
| 1. | small and directionless | 2. | random and directional |
| 3. | random and directionless | 4. | small and directional |
A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous and homozygous recessive individuals in the population?
| 1. | 0.16 (AA); 0.36 (Aa); 0.48 (aa) |
| 2. | 0.36 (AA); 0.48 (Aa); 0.16 (aa) |
| 3. | 0.16 (AA); 0.24 (Aa); 0.36 (aa) |
| 4. | 0.16 (AA); 0.48 (Aa); 0.36 (aa) |
In a species, the weight of a newborn ranges from 2 to 5 kg. 97% of the newborns with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 kg to 5 kg die. Which type of selection process is taking place?
| 1. | Cyclical selection | 2. | Directional selection |
| 3. | Stabilizing selection | 4. | Disruptive selection |
Match the hominids with their correct brain size:
| Column I | Column II | ||
| (a) | Homo habilis | (i) | 900 cc |
| (b) | Homo neanderthalensis | (ii) | 1350 cc |
| (c) | Homo erectus | (iii) | 650-800 cc |
| (d) | Homo sapiens | (iv) | 1400 cc |
Select the correct option.
| Options: | (a) | (b) | (c) | (d) |
| 1. | (iv) | (iii) | (i) | (ii) |
| 2. | (iv) | (i) | (iv) | (ii) |
| 3. | (iii) | (ii) | (i) | (iv) |
| 4. | (iii) | (iv) | (i) | (ii) |
The finches of the Galapagos islands provide evidence in favour of:
1. special creation
2. evolution due to mutation
3. retrogressive evolution
4. biogeographical evolution
Select the correct statement from the following:
| 1. | Darwin variations are small and directionless |
| 2. | fitness is the end result of the ability to adapt and gets selected by nature |
| 3. | all mammals except whales and have seven cervical vertebrae |
| 4. | Mutations are random and directional |
| 1. | Thorn of Bougainvillea and tendrils of Cucurbita – Analogous organs |
| 2. | Nictitating membrane and blind spot in the human eye – vestigial organs |
| 3. | Nephridia of the earthworm and Malpighian tubules of cockroach - Excretory organs |
| 4. | Wings of a honey bee and wings of crow - Homologous organs |
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