Organisms and Populations Test

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Organisms and Populations Test - 47

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Weekly Quiz Competition

Question 1
1 / -0

Potential natality is

A
Realised natality

B
Biotic potential

C
Vital index

D
None of the above

Solution

The maximum number of births produced per individual under ideal conditions of environment is called "potential natality". Potential natality is also called biotic potential, absolute natality or maximum natality.
Hence, answer is "Biotic potential".
Question 2
1 / -0

A population with equal number of births and deaths will show

A
Acceleration phase of growth

B
Plateau phase

C
Exponential growth phase

D
Initial phase of growth

Solution

When the number of births and deaths in a given population are the same, the birth rate will be equal to the death rate. As a result, there will be zero population growth and the population will be stable, showing the plateau phase.
So the correct option is B.
Question 3
1 / -0

Female mosquitoes sucking human blood at intervals are

A
Permanent parasites

B
Endoparasites

C
Semiparasites

D
Intermittent parasites

Solution

Parasites are organisms that live or feed on other organisms for their food, nutrition, shelter, etc. They exhibit population interaction called parasitism in which one organism is harmed and the other gets its benefit. As these mosquitoes suck human blood and harm them with their vectors, they are said to be parasites. And they feed at regular intervals, so the mode is intermittent parasitism and they are intermittent parasites.
So, option d is the correct answer.
Question 4
1 / -0

Species interaction with negative influence on both is

A
Predation

B
Parasitism

C
Amensalism

D
Competition

Solution

There are various population interactions in an ecological community. In all these, competition is a type of interaction in which there is struggle for existence between all the species involved. As a result there is constant competition for food, shelter, water, etc. Survival of the fittest can be seen. As a result, there is no mutual benefit and both the species are harmed.
So, the correct answer is 'Competition'
Question 5
1 / -0

Competition is the most severe between two ____________.

A
Closely related species growing in different niches

B
Closely related species growing in same niches

C
Distantly related species growing in same niches

D
Distantly related species growing in different niches
Question 6
1 / -0

In a population, rate of addition of new members is higher than the rate of individuals lost. It shows

A
Zero population growth

B
Declined growth

C
Exponential growth

D
None of these

Solution

When the rate of increase in population in high, then it is known as an exponential growth phase.
Question 7
1 / -0

Human population shows

A
J-shaped growth curve

B
Z-shaped growth curve

C
S-shaped growth curve

D
All of the above

Solution

Human population S shaped growth curve. Firstly, there is a slow increase i population, it is followed by a rapid increase in population, and then the population declines.
So, option C is the correct answer.
Question 8
1 / -0

The phenomenon of one organism being benefited without affecting the other is

A
Scavenging

B
Amensalism

C
Commensalism

D
Symbiosis

Solution

Commensalism is a type of environmental interaction. Int his type of interaction, out of the two species involved, one is benefited and another one is neither harmed nor benefited.
So, option C is the correct answer.
Question 9
1 / -0

When the population reaches carrying capacity, which of the following equation can be related to it?

A
Mortality Rate=Birth Rate

B
Mortality Rate > Birth Rate

C
Mortality Rate < Birth Rate

D
None of the above

Solution

Carrying capacity is the maximum number of population species that the particular environment can survive. In this case, the number of individuals that are mortal and the number of new births will be equal. SO, the mortality rate will be equal to birth rate.
So, option A is the correct answer.
Question 10
1 / -0

Permanent decrease in population would like due to

A
Migration

B
Natality

C
Emigration

D
Mortality

E
Territoriality

Solution

The movement of some individuals of a species in a particular population out of that particular area is called emigration. When the individuals move in to the particular area, it is called immigration. Thus, movement of species out of that area, called emigration, is the cause of decrease in population.
So, option C is the correct option.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 47

Result

Organisms and Populations Test - 47

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SHARING IS CARING

Question 1

Realised natality

Biotic potential

Vital index

None of the above

Solution

Question 2

Acceleration phase of growth

Plateau phase

Exponential growth phase

Initial phase of growth

Solution

Question 3

Permanent parasites

Endoparasites

Semiparasites

Intermittent parasites

Solution

Question 4

Predation

Parasitism

Amensalism

Competition

Solution

Question 5

Closely related species growing in different niches

Closely related species growing in same niches

Distantly related species growing in same niches

Distantly related species growing in different niches

Question 6

Zero population growth

Declined growth

Exponential growth

None of these

Solution

Question 7

J-shaped growth curve

Z-shaped growth curve

S-shaped growth curve

All of the above

Solution

Question 8

Scavenging

Amensalism

Commensalism

Symbiosis

Solution

Question 9

Mortality Rate=Birth Rate

Mortality Rate > Birth Rate

Mortality Rate < Birth Rate

None of the above

Solution

Question 10

Migration

Natality

Emigration

Mortality

Territoriality

Solution

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