Multiple Choice QuestionsWhen 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
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
C.
number of annual rings
Age of tree can be estimated by a number of annual rings. The two kinds of woods that appear as alternate concentric rings; constitute an annual ring heartwood comprises dead elements with highly lignified walls that give mechanical support to the steam. The height and girth of a tree increase due to the activity of vascular cambium.
An association of individuals of different species living in the same habital and having functional interactions is
Ecological niche
Biotic community
Ecosystem
Ecosystem
The osmotic expansion of a cell kept in water is chiefly regulated by
mitochondria
vacuoles
plastids
plastids
In which of the following interactions both partners are adversely affected?
Competition
Predation
Parasitism
Parasitism
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
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
Which one of the following is categorised as a parasite in the true sense?
Human foetus developing inside the uterus draws nourishment from the mother
Head louse living on the human scalp as well as laying eggs on human hair
The cuckoo (koel) lays its eggs in crow's nest
The cuckoo (koel) lays its eggs in crow's nest
What type of human population is represented by the following age pyramid? 
Stable population
Declining Population
Expanding population
Expanding population
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