Q. No.The principle of competitive exclusion was stated by:
1.
G. F. Gause.
2.
Mac Arthur.
3.
Verhulst and Pearl.
4.
C. Darwin.
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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. amensalism.
2. commensalism.
3. parasitism.
4. mutualism.
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Asymptote in a logistic growth curve is obtained when:
| 1. | K = N | 2. | K > N |
| 3. | K < N | 4. | The value of ‘r’ approaches zero |
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Natality refers to
1. Number of individuals leaving the habitat
2. Birth rate
3. Death rate
4. Number of individuals entering a habitat
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Which one of the following population interactions is widely used in medical science for the production of
antibiotics?
1. Parasitism
2. Mutualism
3. Commensalism
4. Amensalism
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In a growing population of a country:
| 1. | Reproductive and pre-reproductive individuals are equal in number. |
| 2. | Reproductive individuals are less than post-reproductive individuals. |
| 3. | Pre-reproductive individuals are more than reproductive individuals. |
| 4. | Pre-reproductive individuals are less than reproductive individuals. |
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A keystone species is the one which has
1. A small proportion of total biomass but has huge impact on community’s organisation and survival
2.A plenty of biomass but low impacts on community’s organisation
3. A rare species with little impact on biomass and other species in the community
4. A dominant species which has a large proportion of biomass and which affects many other species
A system of rotating crops with legume or grass pastures to improve soil structure and fertility is called:
1. Shifting agriculture
2. Ley farming
3. Contour farming
4. Strip farming
It is much easier for a small animal to run uphill than for a large animal, because:
1. The efficiency of muscles in large animals is less than in the small animals.
2. It is easier to carry a small body weight.
3. Smaller animals have a higher metabolic rate.
4. Small animals have a lower requirement.
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