A person entering an empty room suddenly finds a snake right in front on opening the door. Which one of the following is likely to happen in his neurohormonal control system?
| 1. | Sympathetic nervous system activated releasing epinephrine and norepinephrine from adrenal medulla |
| 2. | Neurotransmitters diffuse rapidly across the cleft and transmit a nerve impulse |
| 3. | Hypothalamus activates the parasympathetic division of the brain |
| 4. | Sympathetic nervous system is activated releasing epinephrine and norepinephrine from the adrenal cortex |
Which one of the following is not a gaseous biogeochemical cycle in the ecosystem?
1. Sulphur cycle
2. Phosphorus cycle
3. Nitrogen cycle
4. Carbon cycle
A single strand of nucleic acid tagged with a radioactive molecule is called:
| 1. | Vector | 2. | Selectable marker |
| 3. | Plasmid | 4. | Probe |
Which one of the following options gives one correct example of convergent evolution and divergent evolution?
| Convergent Evolution | Divergent Evolution | |
| 1. | Eyes of octopus and mammals | Bones of forelimbs of vertebrates |
| 2. | Thorns of Bougainvillea and tendrils Cucurbita | Wings of butterflies and birds |
| 3. | Bones of forelimbs of vertebrates | Wings of butterfly and birds |
| 4. | Thorns of Bougainvillea and tendrils of Cucurbita | Eyes of Octopus and mammals |
2. Sporopollenin
3. Lignin
4. Cellulose
Cycas and Adiantum resemble each other in having:
1. Seeds
2. Motile sperms
3. Cambium
4. Vessels
What was the most significant trend in the evolution of modem man (Homo sapiens) from his ancestors?
1. Shortening of jaws
2. Binocular vision
3. Increasing cranial capacity
4. upright posture
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