Q. No.In a growing population of a country:
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.
1. Commensalism
2. Mutualism
3. Parasitism
4. Amensalism
| 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 |
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
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