Q. No.According to Darwin, organic evolution is due to:
1.
Interspecific competition.
2.
Competition within closely related species.
3.
Reduced feeding efficiency in one species due to the presence of interfering species.
4.
Intraspecific competition.
What type of human population is represented by the following age pyramid?
1. Stable population
2. Declining population
3. Expanding population
4. Vanishing population
| 1. | Human foetus developing inside the uterus draws nourishment from the mother |
| 2. | Head louse living on the human scalp as well as laying eggs on human hair |
| 3. | The cuckoo (koel) lays its eggs in a crow's nest |
| 4. | The female Anopheles bites and sucks blood from humans |
Formation of tropical forests needs mean annual temperature and mean annual precipitation as:
1. 18 – 25oC and 150 - 400cm
2. 5 – 15oC and 50 – 100 cm
3. 30 – 50oC and 100 – 150cm
4. 5 – 15oC and 100 – 200 cm
The table below gives the populations(in thousands) of ten species(A--J) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the table and answer the question as follows:
which area out of a to d shows maximum species diversity?
1. b
2. c
3. a
4. d
The population of an insect species shows an explosive increase in numbers during the rainy season followed by its disappearance at the end of the season. What does this show?
| 1. | S-shaped or sigmoid growth of this insect |
| 2. | the food plants mature and die at the end of the rainy season |
| 3. | Its population growth curve is of J-type |
| 4. | The population of its predators increases enormously |
If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:
1. a normal distribution
2. a bi-modal distribution
3. a T-shaped curve
4. a skewed curve
| 1. | Smaller animals have a higher metabolic rate |
| 2. | Small animals have a lower O2 requirement |
| 3. | The efficiency of muscles in large animals is less than, in the small animals |
| 4. | It is easier to carry a small body weight |
1. Commensalism
2. Mutualism
3. Parasitism
4. Amensalism
| 1. | pre-reproductive individuals are more than reproductive individuals. |
| 2. | reproductive individuals are less than post-reproductive individuals. |
| 3. | reproductive and pre-reproductive individuals are equal in number. |
| 4. | pre-reproductive individuals are less than reproductive individuals. |
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