Q. No.
If '+' sign is assigned to beneficial interaction, '-' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '-' refers to
(1) Mutualism
(2) Amensalism
(3) Commensalism
(4) Parasitism
The principle of competitive exclusion was stated by
(1) C Darwin
(2) GF Gause
(3) MacArthur
(4) Verhuisd and Pearl
Gause's principle of competitive exclusion states that
| 1. | Competition for the same resources excludes species having different food preferences |
| 2. | No two species can occupy the same niche indefinitely for the same limiting resources |
| 3. | Larger organisms exclude smaller ones through competition |
| 4. | More abundant species will exclude the less abundant species through competition |
An association of individuals of different species living in the same habitat and having functional interactions is.
1. ecological niche
2. biotic community
3. ecosystem
4. population
In which of the following interactions both partners are adversely affected?
(1) Competition
(2) Predation
(3) Parasitism
(4) Mutualism
A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is
1. 10
2. 15
3. 05
4. zero
Which one of the following is categorised as a parasite in true sense?
| 1. | Human foetus developing inside the uterus draws nourishment from the mother |
| 2. | Head lice living on the human scalp as well as laying eggs on human hair |
| 3. | The cuckoo (koel) lays its eggs in crow's nest. |
| 4. | The female Anopheles bites and sucks blood from humans. |
Study the four statements (1-4) given below and select the two correct ones out of them.
(1) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being
consumers
(2) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates
(3) Predators ultimately lead to the extinction of prey species
(4) Production of chemicals such as nicotine, strychnine by the plants are metabolic
disorders
The two correct statements are
1. (2) and (3)
2. (3) and (4)
3. (1) and (4)
4. (1) and (2)
A country with a high rate of population growth took measures to reduce it. The figure below shows age sex pyramids of populations. A and B twenty years apart. Select the correct interpretation about them.
Interpretations
1. 'A' is more recent and shows slight reduction in the growth rate
2. 'B' is earlier pyramid and shows stabilized growth rate
3. 'B' is more recent showing that population is very young
4. 'A' is the earlier pyramid and no change has occured in the growth rate
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