Birth rate = B Death Rate = D Emigration = E Immigration = I

 Column-I Column-II A. Population is stable I.   B + I > D + E B. Population is increasing II.  B + I = D + E C. Population is decreasing III. B + I < D + E IV. B + E > D + I

(1) A - II, B - I, C – III

(2) A - II, B - IV, C - III

(3) A - III, B - IV, C – I

(4) A - I, B - II, C - IV

Subtopic:  Population Characters: Density |
88%
From NCERT
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The density of a population in a given habitat during a given period, fluctuates due to changes in four basic processes. On this basis fill up A and B boxes in the given diagram with correct options:

(a) A = Natality + Immigration, B = Mortality + Emigration

(b) A = Natality + Mortality, B = Immigration + Emigration

(c) A = Birth rate + Death rate, B = Migration + Emigration

(d) A = Natality + Emigration, B = Mortality + Immigration

Subtopic:  Population Characters: Density |
94%
From NCERT
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Population density will increase if

1.  Number of births and number of deaths increase.

2.  Number of births and number of immigrants is high.

3.  Number of immigrants and number of deaths is high.

4.  Number of births and number of immigrants is low.

Subtopic:  Population Characters: Density |
94%
From NCERT
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Which the following pairs is wrongly matched while remaining three are correct

1. Allen’s rule – Mammals with shorter ears and limbs in colder area

2. Expanding population – High number of individual at pre-reproductive stage

3. Population density increasing – (B + I) < (D + E)

4. Carrying capacity – Logistic growth.

Subtopic:  Population Characters: Density |
92%
From NCERT
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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

1. 10

2. 15

3. 05

4. zero

Subtopic:  Population Characters: Density |
90%
From NCERT
NEET - 2013
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Population growth of a species is not related to which of the following parameters?
(1) Nt + 1 = Nt + [(B + I) − (D + E)]

(2) Out of the four basic processes effecting population growth three leads to increase in population size

(3) For a newly colonised habitat immigration plays major role than birth rate

(4) Under normal conditions, natality and mortality are the most important factors

Subtopic:  Population Characters: Density |
83%
From NCERT
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The biological community can have

1. An isolated population of plants which doesn't depend on animals and microbes

2. An isolated population of animals which doesn't depend on plants and microbes

3. An isolated population of microbes which doesn't depend on plants and animals

4. No isolated population is possible there.

Subtopic:  Population Characters: Density |
79%
From NCERT
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Which of the following is not a factor that would limit the growth of a population?

(1) Food shortage

(2) Immigration

(3) Disease

(4) Famine

Subtopic:  Population Characters: Density |
66%
From NCERT
AIIMS - 2017
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Triangular age pyramid represents
1. Expanding population.
2. Declining population.
3. Mature population.
4. Both 1. and 3.

Subtopic:  Population Characters: Density |
69%
From NCERT
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A country with a high rate of population growth took measures to reduce it. The figure below shows age sex pyramids of populations. A and B twenty years apart. Select the correct interpretation about them.

Interpretations

1. 'A' is more recent and shows slight reduction in the growth rate

2. 'B' is earlier pyramid and shows stabilized growth rate

3. 'B' is more recent showing that population is very young

4. 'A' is the earlier pyramid and no change has occured in the growth rate

Subtopic:  Population Characters: Density | Population Characters: Age Structure & Migration |
From NCERT
NEET - 2009
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