Q. No.Which of the following is not a function of predators?
1. They act as conduits for energy transfer across trophic levels
2. They keep prey populations under control
3. They help in the stabilization of the ecosystems
4. They decrease the species diversity in a community
Very small animals are rarely found in polar region mainly because:
1. Smaller animals have a relatively slower heart rate
2. Smaller animals have a more surface area relative to their volume
3. Smaller animals are invariably herbivores
4. Smaller animals rely on diffusion for exchange of gases with the environment
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
Organisms with very high intrinsic growth rates have:
1. Long generation times
2. Short generation times
3. No courtship behaviour
4. No carrying capacities
Intraspecific competition is strongest when the:
1. Species overlap in their distribution
2. Populations overlap in their ranges
3. Population is at its carrying capacity
4. Reproductive rate is at its maximum
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.
Asymptote in a logistic growth curve is obtained, when
(1) The value of 'r' approaches zero
(2) K = N
(3) K > N
(4) K < N
Which of the following is correct for r-selected species?
(1) Large number of progeny with small size
(2) Large number of progeny with large size
(3) Small number of progeny with small size
(4) Small number of progeny with large size
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