Organisms and Populations Test

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Organisms and Populations Test - 43

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Weekly Quiz Competition

Question 1
1 / -0

During ............ type of interaction, both organisms are benefited.

A
Mutualism

B
Competition

C
Commensalism

D
Parasitism
Solution
- Mutualism or symbiosis is a mutually beneficial relationship between individuals of two different species.
- It is a symbiotic association between two organisms in which both are benefited.
- None of the two is capable of living separately. Mutualism or symbiosis is generally considered to be obligatory.
- For example, nitrogen fixing Rhizobium bacteria living in root nodules of leguminous plants.
- Thus, the correct answer is option A.
Question 2
1 / -0

The permanent decrease in population number occurs due to

A
Mortality

B
Natality and migration

C
Territoriality

D
Emigration

Solution

Mortality is the state of being death. It reduces the component of population and thus causes the permanent decrease in population number.
Question 3
1 / -0

Percentage ratio of natality over mortality is

A
Vital Index

B
Population dynamics

C
Population density

D
Total count

Solution

The vital index is the ratio of births to death in a human population at a given time. It also helps to determine the biotic stability of a population. It fluctuates in case of emigration and immigration.
So, the correct answer is option A.
Question 4
1 / -0

In some species, individuals forego reproduction and help bring up another individual's offspring. Such altruistic behaviour cannot be explained by which of the following?

A
An individual helps relatives only and gets indirect genetic benefits

B
The individual benefits because it can later inherit the breeding position

C
The individual benefits because it gets access to resources, such as food and security from predators, in return

D
The species benefits from a reduction in competition among offspring
Solution
- A behavior that reduces the fitness of the doer and increases the fitness of the recipient is said to be altruistic.
- There is no direct benefit involved in this to the doer. However, there are indirect genetic benefits in which the organism with better traits is taken care of.
- Since the individual takes care of the population it inherits the breeding population.
- Also, the number of offsprings are less . Hence the species will be benefited from reduced competition for food, territory and other resources. Thus the correct answer is option C.
Question 5
1 / -0

The interaction observed in this diagram is

A
Commensalism

B
Competition

C
Mutualism

D
Predation
Solution
- Commensalism refers to a relationship wherein one organism is benefitted while others remain unaffected.
- Predation refers to the act of feeding on other animals.
- Competition refers to the struggle for the same resource between the organisms.
- Mutualism is an association of organisms wherein both are benefitted.
In the given image, the larger birds are capturing the smaller one for food. So, it represents predation.
So, the correct answer is option D.
Question 6
1 / -0

Many populations colonizing a new habitat show a logistic population growth pattern over time, as shown in the figure. In such a population, the POPULATION growth rate.

A
Stays constant over time

B
Increases and then reaches an asymptote

C
Decreases over time

D
Increases to a maximum and then decreases

Solution

The given image represents the population growth curve which is given by the equation of dN/dT=rN(1-N/K). Here, the growth rate increases in the log phase and then reaches a plateau. This is the phase when the N approaches to K which causes a decrease in dN/dT value and the graph reaches to an asymptote.
Thus, the correct answer is option B.
Question 7
1 / -0

The figure below demonstrates the growth curves of two organisms A and B growing in the same area. What kind of relation exists between A and B?

A
Competition

B
Symbiosis

C
Commensalisms

D
Mutualism

Solution

The graph depicts the increase in biomass for organisms A and B with respect to time. In the absence of A, the organism B shows an increase in biomass with time and in the absence of B the organism. A shows an increase in biomass with time. This behaviour of the organisms in the absence of the other shows competition between the two of them for food and other resources. Thus the correct answer is option A.
Question 8
1 / -0

Which one of the following interactions does not promomte coevolution?

A
Predator prey relation

B
Mutualism

C
Commensalism

D
Interspecific competition

Solution

The evolution of organisms due to their interaction with each other is called coevolution. Interaction is seen in a predator-prey relation, parasitism, and interspecific competition. In commensalism, only one organism is benefited and the other organism is neither benefited nor harmed. Since there is no evolutionary relationship between the two this interaction will not lead to coevolution. Thus, the correct answer is option B.
Question 9
1 / -0

Find the incorrect match :
I II III
I Crab Sacculina Interaction ++
II Human being Mosquito Interaction - +
III Sea anemone Hermit crab Interaction + 0

A
I only

B
II and III

C
III and I

D
II only

Solution
Question 10
1 / -0

Brood parasite is

A
Crow

B
Pigeon

C
House sparrow

D
Koel

Solution

Brood parasitism is when a bird lays its egg in the nest of another bird. The host bird is then responsible for raising and feeding the parasite bird chick.it is known as brood parasitism because a nest of a baby bird is called as a brood. koel is a brood parasite as it lays it's egg in crow's nest.
So, the correct answer is 'Koel'.

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	I	II	III
I	Crab	Sacculina	Interaction ++
II	Human being	Mosquito	Interaction - +
III	Sea anemone	Hermit crab	Interaction + 0

Organisms and Populations Test - 43

Result

Organisms and Populations Test - 43

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SHARING IS CARING

Question 1

Mutualism

Competition

Commensalism

Parasitism

Solution

Question 2

Mortality

Natality and migration

Territoriality

Emigration

Solution

Question 3

Vital Index

Population dynamics

Population density

Total count

Solution

Question 4

An individual helps relatives only and gets indirect genetic benefits

The individual benefits because it can later inherit the breeding position

The individual benefits because it gets access to resources, such as food and security from predators, in return

The species benefits from a reduction in competition among offspring

Solution

Question 5

Commensalism

Competition

Mutualism

Predation

Solution

Question 6

Stays constant over time

Increases and then reaches an asymptote

Decreases over time

Increases to a maximum and then decreases

Solution

Question 7

Competition

Symbiosis

Commensalisms

Mutualism

Solution

Question 8

Predator prey relation

Mutualism

Commensalism

Interspecific competition

Solution

Question 9

I only

II and III

III and I

II only

Solution

Question 10

Crow

Pigeon

House sparrow

Koel

Solution

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