81. The formula for exponential population growth is

A $$\frac{{dN}}{{rN}} = dt$$
B $$\frac{{rN}}{{dN}} = dt$$
C $$\frac{{dN}}{{dt}} = rN$$
D $$\frac{{dt}}{{dN}} = rN$$
Answer :   $$\frac{{dN}}{{dt}} = rN$$
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82. 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 :

A 15
B 05
C Zero
D 10
Answer :   Zero
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83. The maximum growth rate occurs in

A stationary phase
B senescent phase
C lag phase
D exponential phase
Answer :   exponential phase
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84. Geometric representation of age structure is a characteristic of

A population
B landscape
C ecosystem
D biotic community
Answer :   population
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85. Xeric environment is characterised by

A precipitation
B low atmospheric humidity
C extremes of temperature
D high rate of vapourisation
Answer :   low atmospheric humidity
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86. The logistic population growth is expressed by the equation:

A $$\frac{{dt}}{{dN}} = Nr\left( {\frac{{K - N}}{K}} \right)$$
B $$\frac{{dN}}{{dt}} = rN\left( {\frac{{K - N}}{K}} \right)$$
C $$\frac{{dN}}{{dt}} = rN$$
D $$\frac{{dN}}{{dt}} = rN\left( {\frac{{N - K}}{N}} \right)$$
Answer :   $$\frac{{dN}}{{dt}} = rN\left( {\frac{{K - N}}{K}} \right)$$
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