Practice free Organism and Population (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
When the population density reaches the carrying capacity, the logistic growth curve is said to be in:
Answer 4. Read page 231, XII NCERT
In general, which of the following is not an adaptation seen in parasites in accordance with their life style?
Answer 3. Read page 235, XII NCERT
Organisms with very high intrinsic growth rates have:
Answer 2. This is a characteristic of r-selected population.
Intraspecific competition is strongest when the:
Answer 3. Mind the fact that the question is on intraspecific competition and not interspecific completion. When the population is at carrying capacity, the limited natural resources will lead to a strong competition.
No predator can become proficient at acquiring prey because:
(d) There is a sort of 'arm race' between predator and prey where both evolve to achieve their goals. Moreover, a predator has to be prudent in killing the prey as well.
A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is
Commensalism is an association between organisms in which one or both the species are benefitted an neither species is harmed. In amensalism one species is harmed, whereas the other is unaffected. Predation, parasitism and commensalism share a common characteristic, the interacting species live closely together.
When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt = rN(1-N/K)
(d) In logistic growth model population growth equation is described as
dN/dt = rN(K-N)/K
where, N = Population density at time t
r = Intrinsic rate of natural increase
K = Carrying capacity
when, N/K = 1 then (K-N)/K = 0
Therefore, dN/dt = 0
An association of individuals of different species living in the same habitat and having functional interactions is.
An association of individuals of different species living in the same habitat and having functional interaction is called biotic community (biocoenosis). The biotic community is dominated by one of the character. It determines the nature of community. It can be biotic or abiotic.
In which of he following interactions both partners are adversely affected?
Competition is a negative interaction that occurs among organisms whenever two or more organisms require the same limited resource.
|
Species A |
Species B |
Name of Interaction |
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+ |
+ |
Mutualism |
|
- |
- |
Competition |
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+ |
- |
Predation |
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+ |
- |
Parasitism |
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
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