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Organisms and Populations

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Question
CBSEENBI12002642
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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

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

  • 'B' is earlier pyramid and shows stabilised

  • 'B' is more recent showing that population is very young

  • 'A' is the earlier pyramid and no change has occurred in the growth rate

Solution

A.

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

Interpretation 'A' is correct for the given figures.

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Question
CBSEENBI12002753
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A high density of elephant population in an area can result in

  • Mutualism

  • Intraspecific competition

  • Interspecific competition

  • Predation on one another

Solution

B.

Intraspecific competition

Intraspecific competition is an important density dependent factor regulating populations. Intraspecific competition occur between the members of same population. 

Question
CBSEENBI12002200
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Age of tree can be estimated by

  • Its height of girth

  • biomass

  • number of annual rings

  • the diameter of its heartwood

Solution

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.

Question
CBSEENBI12002826
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Alexander Von Humbolt described for the first time

  • Ecological Biodiversity

  • Laws of limiting factor

  • Species area relationships

  • Population Growth equation

Solution

C.

Species area relationships

Question
CBSEENBI12002248
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An association of individuals of different species living in the same habital and having functional interactions is

  • Ecological niche

  • Biotic community

  • Ecosystem

  • Population

Solution

B.

Biotic community

An association of individuals of different species living in the same habitat and having functional interaction is called biotic community (biocoenosis). The biotic community is dominated by one of the character. It determines the nature of community. It can be biotic or abiotic. 

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