Q. No.When the population density reaches the carrying capacity, the logistic growth curve is said to be in:
1. Lag phase
2. A phase of acceleration
3. A phase of deceleration
4. Asymptote
In general, which of the following is not an adaptation seen in parasites in accordance with their life style?
1. Loss of unnecessary sense organs
2. Presence of adhesive organs
3. Low reproductive capacity
4. Loss of digestive system
No predator can become proficient at acquiring prey because:
| 1. | Predators are not as intelligent as prey. |
| 2. | Predators are too large to be fast enough. |
| 3. | Prey populations evolve more rapidly than predator populations. |
| 4. | Prey populations evolve anti-predatory traits. |
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
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