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The logistic growth curve of animal population growth is more realistic than J shaped curve because:
2. Page 231, XII NCERT
Which of the following is not a function of predators?
Page 233, XII NCERT
Predators help in maintaining species diversity in a community, by reducing the intensity of competition among competing prey species.
Very small animals are rarely found in polar region mainly because:
Answer 2. Read page 224, XII NCERT
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
Which type of animal tissue changes the diameter of a blood vessel?
(c) That would be smooth muscles present in the walls of the blood vessels.
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.
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