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An urn-shaped population age pyramid represents

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Important Questions on Organisms and Populations

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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 36 - Organisms and Populations>MCQS CORNER>Q 84
Given figures represent comparative age-sex pyramids for India for the years 1971 (figure A) and 1991 (figure B), over the 20-year period.
Study carefully the pyramids and select the correct statement regarding these.
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 36 - Organisms and Populations>MCQS CORNER>Q 85
Age-sex structure of a population can be depicted in the following figures:
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Study carefully the above age-sex pyramids and select the correct statements regarding these.
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 36 - Organisms and Populations>MCQS CORNER>Q 100
ln a population per capita birth rate is 0.15 and per capita death rate is 0.08 during a unit time period. What is the value of r (intrinsic rate of natural increase) for the given population?
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 36 - Organisms and Populations>MCQS CORNER>Q 104
The maximum possible number of individuals that a habitat can support is called its
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 36 - Organisms and Populations>MCQS CORNER>Q 107

Study the population growth curves (A and B) in the given graph and select the incorrect option.

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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 36 - Organisms and Populations>MCQS CORNER>Q 108
Which of the following statements is correct?
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 36 - Organisms and Populations>MCQS CORNER>Q 109
Species interaction with negative influence on both is referred to as
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MTG OBJECTIVE NCERT AT YOUR FINGERTIPS BIOLOGY CLASS XI + XII>Chapter 36 - Organisms and Populations>MCQS CORNER>Q 110

Refer to the given table. If '+' sign has been assigned for beneficial interaction, '-' sign for detrimental interaction, and '0' for neutral interaction, identify the type of interaction (i), (ii), and (iii) and select the correct option.

Species A Species B Type of interaction
- _ i
+ _ ii
+ 0 iii