Q. No.Select the correct statement from the following:
1.
Mutations are random and directional.
2.
Darwinian variations are small and directionless.
3.
Fitness is the end result of the ability to adapt and get selected by nature.
4.
All mammals except whales and camels have seven cervical vertebrae.
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Amongst the human ancestors the brain size was more than 1000 cc in
1. Homo habilis
2. Homo neanderthalensis
3. Homo erectus
4. Ramapithecus
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The concept of chemical evolution is based on:
| 1. | Possible origin of life by a combination of chemicals under suitable environmental conditions. |
| 2. | Crystallization of chemicals |
| 3. | Interaction of water, air, and clay under intense heat |
| 4. | Effect of solar radiation on chemicals |
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Thorn of Bougainvillea and tendril of Cucurbita are examples of:
| 1. | Retrogressive evolution | 2. | Analogous organs |
| 3. | Homologous organs | 4. | Vestigial organs |
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Which one of the following pairs of items correctly belongs to the category of organs mentioned against it?
1. Wings of honey bee and wings of crow - Homologous organs
2. Thorn of Bougainvillea and tendrils of Cucurbita - Analogous organs
3. Nictitating membrane and blind spot in human eye - Vestigial organs
4. Nephridia of earthworm and Malpighian tubules of cockroach - Excretory organs
Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?
1. They could maintain an internal environment
2. They were able to reproduce
3. They could separate combinations of molecules from the surroundings.
4. They were partially isolated from the surroundings.
Which one of the following scientists' names is correctly matched with the theory put forth by him?
1. Mendel - Theory of Pangenesis
2. Weismann - Theory of continuity of germplasm
3. Pasteur - Inheritance of acquired characters
4. De Vries - Natural selection
What is true about the isolated small tribal populations?
| 1. | There is no change in population size as they have a large gene pool. |
| 2. | There is a decline in population as boys marry girls only from their own tribe. |
| 3. | Hereditary diseases like color blindness do not spread in the isolated population. |
| 4. | Wrestlers who develop strong body muscles in their lifetime pass this character on to their progeny. |
In the case of peppered moth (Biston betularia), the black-colored form became dominant over the light-colored form in England during the industrial revolution. This is an example of:
| 1. | Inheritance of darker color character acquired due to the darker environment. |
| 2. | Natural selection whereby the darker forms were selected. |
| 3. | Appearance of the dark-colored individuals due to very poor sunlight |
| 4. | Protective mimicry |
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