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Q. No.
If ‘N’ is the population density at time ‘t’, then its density at time ‘t+1’ is:
I. Nt+1 = Nt + [(B+I) – (D+E)]
II. B is a measure of Natality and D is a measure of Mortality
III. If (B+I) is less than (D+E), the population density will increase
 
1. Only I and II are correct 2. Only I and III are correct
3. Only II and III are correct 4. I, II and III are correct
Subtopic:  Population: Exponential Growth Model |
 87%
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All the following are correct about the exponential growth of population except:

1. It is represented by the equation dt/dN = rN
2. Resources in the habitat are unlimited
3. The rate of natural increase is represented by “r”
4. In 1981, the ‘r’ value for human population in India was 0.0205
Subtopic:  Population: Exponential Growth Model | Population: Logistic Growth Model |
 63%
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When population density is plotted against time, the exponential growth curve is:

1. S shaped 2. Straight line
3. J shaped 4. Hyperbola
Subtopic:  Population: Exponential Growth Model |
 80%
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In the formula for exponential growth (dN/dt = rN), what does ‘r’ stand for?
1. the carrying capacity of the environment
2. the change in time
3. the number of individuals in the population
4. the intrinsic rate of natural increase of the population

Subtopic:  Population: Exponential Growth Model |
 90%

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Which of the following is/are true for the given equation?
Nt = N0 ert 

I. It is the integral form of exponential growth equation
II. The rate of natural increase is represented by “r”
III. “e” is the base of natural logarithm [2.71828]

1.I and II only2.I and III only
3.II and III only4.I, II and III

Subtopic:  Population: Exponential Growth Model |
 82%

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The logistic growth model is more realistic for most animal populations in nature.
Reason (R): Resources for growth for most animal populations are finite and become limiting sooner or later in the nature.
In the light of the above statements, choose the most appropriate answer from the options given below :
1. (A) is True but (R) is False.
2. Both (A) and (R) are True and (R) correctly explains (A).
3. (A) is False but (R) is True.
4. Both (A) and (R) are True but (R) does not explain (A).
Subtopic:  Population: Exponential Growth Model | Population: Logistic Growth Model |
 91%
From NCERT

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

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