Organisms and Populations Test

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Organisms and Populations Test - 58

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Weekly Quiz Competition

Question 1
1 / -0

Interaction between, two species in which one feeds on the other is

A
competition

B
a community

C
an ecosystem

D
predation

Solution

Interaction between, two species of organisms in which one feeds on the other is called predation.
So, the correct option is 'predation'.
Question 2
1 / -0

In large natural ecosystems, competition between two species over time will usually result in

A
Each species occupying a slightly different niche

B
Equal numbers of each species persisting for a long time

C
Death of all the members of one species within a short time

D
Hybridization between the two species, resulting in a third species
Solution
- In inter-species competition, two species use the same limited resource.
- A species' niche is basically its ecological role, which is defined by the set of conditions, resources, and interactions it needs.
- The competitive exclusion principle says that two species can't coexist if they occupy exactly the same niche.
- Each species fits into an ecological community in its own special way and has its own tolerable ranges for many environmental factors.
- Species with identical niches also have identical needs, which means they would compete for precisely the same resources and in over time, it will result in death of one species.
So the correct option is 'death of all the members of one species within a short time'.
Question 3
1 / -0

Which of the following is correct in a predator-prey cycle?

A
A decline in the numbers of predators causes a decline in the number of prey

B
A decline in the numbers of prey causes a decline in the number of predators

C
An increase in the number of predators triggers an increase in the numbers of prey

D
All of the above are correct, causing an up-and-down cycle for each animal

Solution

The predators and prey have an interdependent relationship. Predation is very important to manage and maintain the ecological balance of nature.
If the prey species decline the predators' ave thing to feed on and as a result of which the number of the predators also decline.

So, the correct option is 'A decline in the numbers of prey causes a decline in the number of predators'
Question 4
1 / -0

Interaction between two species as both attempt to use the same environmental resources is

A
competition

B
an ecosystem

C
predation

D
symbiosis

Solution

Interaction between two species as both attempt to use the same environmental resources is called competition.
So, the correct option is 'competition'
Question 5
1 / -0

In commensalism interspecific relationship

A
neither species affects the, other

B
favourable to both species

C
favourable to one but no affect on other

D
adverse effect on both species

Solution

Commensalism is a relationship between two living individuals of different species in which one is benefited while the other is neither harmed nor benefited except to a negligible extent.
So, the correct option is 'favourable to one but no affect on other'
Question 6
1 / -0

A probable example of commensalism is

A
mycorrhizal fungal roots on the roots of plants

B
termites with protozoa in their digestive tracts

C
flowering plants and their pollinators

D
barnacles on whales

Solution

Commensalism is a type of interaction in which out of the 2 organisms one is benefitted and the other one is neither harmed and nor benefitted.
The classic example of the commensalism is the barnacles on the whales where the barnacles get the leftover food from the whale.
So, the correct option is 'barnacles on whales'
Question 7
1 / -0

Intraspecific competition is competition among

A
Populations and their regulatory factors

B
Individuals of a community

C
Individuals of a population

D
Species

Solution

The competition that takes place within the members of a species for food, water, mates and breeding places is called intra specific competition.
So, the correct option is 'individuals of a population'.
Question 8
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According to the principle of competitive exclusion

A
Two species cannot coexist-in the same habitat

B
Extinction or emigration are the only possible results of competitive interactions

C
Intraspecific competition results in the success of the best-adapted individuals

D
Two species cannot share the same realized niche in a habitat

Solution

The competitive exclusion principle states that two species competing for the same limiting resource cannot coexist at constant population values. When one species has even the slightest advantage over another, the one with the advantage will dominate in the long term. This leads either to the extinction of the weaker competitor or to an evolutionary or behavioral shift toward a different ecological niche. Competitive exclusion is rarely observed in natural ecosystems.
So the correct option is 'two species cannot share the same realized niche in a habitat'.
Question 9
1 / -0

A two-way flow of benefits in mutualistic interactions between species is an outcome of

A
two-way exploitation

B
resource partitioning

C
close cooperativeness

D
competitive coexistence

Solution

Mutualism is the type of interaction where both the species are being benefitted by the interaction. Both the species exploit each other and get benefitted.
So, the correct option is 'two-way exploitation'
Question 10
1 / -0

Parasitism is an interaction between two species in which

A
Both are harmed

B
Both are benefited

C
One is benefited and the other is neither benefited nor harmed

D
One is benefited and the other is harmed

Solution

A relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm, and is adapted structurally to this way of life.
So the correct option is 'one is benefited and the other is harmed'.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 58

Result

Organisms and Populations Test - 58

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SHARING IS CARING

Question 1

competition

a community

an ecosystem

predation

Solution

Question 2

Each species occupying a slightly different niche

Equal numbers of each species persisting for a long time

Death of all the members of one species within a short time

Hybridization between the two species, resulting in a third species

Solution

Question 3

A decline in the numbers of predators causes a decline in the number of prey

A decline in the numbers of prey causes a decline in the number of predators

An increase in the number of predators triggers an increase in the numbers of prey

All of the above are correct, causing an up-and-down cycle for each animal

Solution

Question 4

competition

an ecosystem

predation

symbiosis

Solution

Question 5

neither species affects the, other

favourable to both species

favourable to one but no affect on other

adverse effect on both species

Solution

Question 6

mycorrhizal fungal roots on the roots of plants

termites with protozoa in their digestive tracts

flowering plants and their pollinators

barnacles on whales

Solution

Question 7

Populations and their regulatory factors

Individuals of a community

Individuals of a population

Species

Solution

Question 8

Two species cannot coexist-in the same habitat

Extinction or emigration are the only possible results of competitive interactions

Intraspecific competition results in the success of the best-adapted individuals

Two species cannot share the same realized niche in a habitat

Solution

Question 9

two-way exploitation

resource partitioning

close cooperativeness

competitive coexistence

Solution

Question 10

Both are harmed

Both are benefited

One is benefited and the other is neither benefited nor harmed

One is benefited and the other is harmed

Solution

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