Tag: ecology and environment

Questions Related to ecology and environment

Which among these represent a population?

population and how it changes human population ecology and environment zoology

  1. Spider and trapped files in its web

  2. All plants in a forest

  3. Earthworm that lives in grassland

  4. All the Oak trees in a forest

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Correct Option: D
Explanation:

A population is all the organisms that belongs to the same group or species and lives in a particular geographical area with the capability of interbreeding.

All the oak trees in a forest specifically mentions a species that is present in that geographical area.

Urban population of the world is

population and how it changes human population ecology and environment zoology

  1. 45%

  2. 39%

  3. 35%

  4. 30%

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Correct Option: A
Explanation:
The total population of the world is about 7.7 billion and out of this population, about 4.2 billion population is living in the urban area. So, the percentage of urban population of the world is about 55% which is near to 45% among all options given in the question.
So, the correct answer is '45%'.

A population is a group of

population and how it changes human population ecology and environment zoology

  1. Species in a community

  2. Communities in an ecosystem

  3. Individuals in a family

  4. Individuals in a species

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Correct Option: D
Explanation:

A group of different organisms with related characters of a same area is called population.

So the correct option is 'individuals in a species'.

A population consists of the number of individuals in-a given area at a particular time

population and how it changes human population ecology and environment zoology

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

 A population is a group of individuals belonging to a species occupying a given area at a particular time

So, the correct option is 'True'

Match column I with column II and choose the correct option from the given codes.

Column I Column II
A. Population (i) Part of the earth consisting of all the ecosystems of the world
B. Community (ii) Assemblage of all the individuals belonging to different species occurring in an area
C. Ecosphere (iii) Group of similar individuals belonging to the same species, found in an area
D. Ecosphere (iv) Interaction between the living organisms and their physical environment
(v) Classification of organisms based on the type of environment
population and how it changes human population ecology and environment zoology

  1. A-(iii), B-(ii), C-(i), D-(v)

  2. A-(iv), B-(v), C-(iii), D-(i)

  3. A-(ii), B-(iii), C-(i), D-(iv)

  4. A-(iii), B-(ii), C-(iv), D-(i)

Show answer
Correct Option: D
Explanation:
 Column I  Column II
 A. Population  A group of individuals of the same species occupying a particular geographic area. Populations may be relatively small and closed, as on an island or in a valley, or they may be more diffuse and without a clear boundary between them and a neighboring population of the same species.So the correct option is 'group of similar individuals belonging to same species, found in an area'.
 B. Community  A community is a small or large social unit (a group of living things) that has something in common, such as norms, religion, values, or identity. Communities often share a sense of place that is situated in a given geographical area (e.g. a country, village, town, or neighborhood) or in virtual space through communication platforms. Although communities are usually small relative to personal social ties (micro-level), "community" may also refer to large group affiliations (or macro-level), such as national communities, international communities, and virtual communities.So the correct option is 'assemblage of all the individuals belong to different species occurring in an area'. 
 C. Ecosphere  An ecosphere is a planetary closed ecological system. In this global ecosystem, the various forms of energy and matter that constitute a given planet interact on a continual basis. The forces of the four Fundamental interactions cause the various forms of matter to settle into identifiable layers.So the correct option is 'interaction between the living organisms and their physical environment'.
D. Ecosphere The biosphere of the earth or other planet, especially when the interaction between the living and nonliving components is emphasized.So the correct option is 'Part of the earth consisting of all the ecosystems of the world'.

Population ecology is an important area because it (i) ecology to population genetics and (ii) identify (i) and (ii) in the above statement and select the correct option.
                                                       

population and how it changes human population ecology and environment zoology

  1. distinguishes evolution

  2. distinguishes biogenesis

  3. links evolution

  4. links biogenesis

Show answer
Correct Option: C
Explanation:

Population ecology is the sub field of ecology that deals with the dynamics of species populations and how these populations interact with the environment. It is an important area because it links the ecology to population genetics and responsible for evolution. 

So, the correct option is 'Option C' .

The principle of competitive exclusion was enunciated by

population and how it changes human population ecology and environment zoology

  1. Verhulst and Pearl

  2. C. Darwin

  3. G.F. Gause

  4. MacArthur.

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Correct Option: C
Explanation:

The principle of competitive exclusion is also called as Gause's Competitive Exclusion principle which states that two closely related species competing for the same resource can not co-exist indefinitely and the competitively inferior one will be eliminated eventually and this was given by G.F. Gause. So the correct option is "G.F. Gause"

Difference between population and community is

population and how it changes human population ecology and environment zoology

  1. Population is the grouping of individuals of same species at the same place.

  2. Community is the grouping of individuals of same species at the same place same time.

  3. Population is the grouping of individuals of different species at the different place.

  4. Community is the grouping of individuals of different species at the same place at a same time.

Show answer
Correct Option: D
Explanation:

A population may be defined as a group of individuals belonging to a single species. The units of study are populations. Study of interaction between individuals in terms of growth, reproduction, dispersal etc., constitutes population ecology. 

A community may be defined as populations of different species living together in a common habitat. The members of a community may be plants as well as animals. 
Thus, the correct answer is option D.

In modern civilised world, greatest predator of man is

population and how it changes human population ecology and environment zoology

  1. Wild dog

  2. Tiger

  3. Man

  4. Vultures

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Correct Option: C
Explanation:

In modern civilised world, the greatest predator of man is man. Man indulges itself in the activities like deforestation which creates disbalance in nature and generates threats. The population explosion, global warming and floods are the other natural process which disturbs the equilibrium.

The Allee effect is described by

population and how it changes human population ecology and environment zoology

  1. Population growth increases as population density increases, below a certain density.

  2. Population growth increases as population density increases, above a certain density.

  3. Population growth decreases as population density increases, above a certain density.

  4. Population growth increases as population density increases, causing density to then decrease.

  5. Population growth decreases as population density increases, causing density to then decrease.

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Correct Option: C