CBSE
Multiple Choice QuestionsAn association of individuals of different species living in the same habital and having functional interactions is
Ecological niche
Biotic community
Ecosystem
Ecosystem
In biotic community, which of the following can be called protective device ?
Mimicry
Symbiosis
Competition
Parasitism
The osmotic expansion of a cell kept in water is chiefly regulated by
mitochondria
vacuoles
plastids
plastids
The following graph depicts changes in two populations (A and B) of herbivores in a grassy field A possible reason for these changes is that:
both plant populations in this habitat decreased
population B competed more successfully for food than population A
population A produced more offspring than population B
population A produced more offspring than population B
It is much easier for a small animal to run uphill than a large animal, because
smaller animals have a higher metabolic rate
small animals have a lower O2 requirement
the efficiency of muscles in large animals in less than in the small animals
the efficiency of muscles in large animals in less than in the small animals
In which of the following interactions both partners are adversely affected?
Competition
Predation
Parasitism
Parasitism
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)
when N nears the carrying capacity of the habitat
when N/K equals zero
when death rate is greater than birth rate
when death rate is greater than birth rate
Consider the following four conditions (a - d) and select the correct pair of them as adaptation to environment in desert lizards.
The conditions:
I. Burrowing in soil to escape high temperature.
II. Losing heat rapidly from the body during high temperature
III. Bask in sun when temperature is low
IV. Insulating body due to thick fatty dermis
I and III
II and IV
I and II
I and II
Gause's principle of competitive exclusion states that
Competition for the same resources excludes species having different food preferences
No two species can occupy the same niche indefinitely for the same limiting resources
Larger organisms exclude smaller ones through competition
Larger organisms exclude smaller ones through competition
Age of tree can be estimated by
Its height of girth
biomass
number of annual rings
number of annual rings
