Organisms and Populations Test

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Organisms and Populations Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

Sigmoid growth curve define by

A
Malthus

B
Adam smith

C
Verhulst

D
Charles Darwin
Question 2
1 / -0

Population density means

A
The number of human per unit area

B
The number of human in a unit area at a specific time

C
The concentration of human population at a place

D
None of above

Solution

Population density of a species is the number of individual of a species per unit area or volume e.g.,number of animals per square km.
Question 3
1 / -0

Which of the following factors regulate human life with
reference to population density

A
Availability of blood, housing and health facilities

B
Urbanization

C
Climatic conditions

D
All the above

Solution

D. all of the above
Solution : The population density of humans in an area is dependent on many factors including the availability of the food and housing and health facilities. They may also depend on urbanization and climatic conditions of that spot.
So the correct answer is " All of the above".
Question 4
1 / -0

The population density is highest in

A
USA

B
India

C
China

D
Japan
Question 5
1 / -0

If the rate of addition of new members increases with respect
to the individual host of the same population, then the
graph obtained has

A
Declined growth

B
Exponential growth

C
Zero population growth

D
None of these

Solution

Exponential phase is the period of rapid rise in population due to availability of food and requirements of life in plenty and there being no competition.
Question 6
1 / -0

Which one of the following has classified plants on the basis of temperature of the region?

A
Worming

B
Climent

C
Haeckel

D
Raunkiaer

Solution

According to Raunkiaer, the temperature is of the greatest importance in the distribution of plants and the entire vegetation of the earth can be divided into the following 4 classes : (1) Megatherms (2) Mesotherms (3) Microtherms (4) Hekistotherms.
So, the correct answer is option is D.
Question 7
1 / -0

Assertion : Natality rate increases the population size and population density both.

Reason : Natality increases the number of individuals in an area by births.

A
If both the assertion and the reason are true and the reason is a correct explanation of the assertion

B
If both the assertion and the reason are true but the reason is not a correct explanation of the assertion

C
If the assertion is true but the reason is false

D
If both the assertion and the reason are false

E
If the assertion is false but reason is true

Solution

Natality is generally expressed as number of births per 1,000 individuals of a population per year. Crude birth rate is the number of births per 1,000 persons in the middle of a given year, i.e., on July 07, It increases the population size (total number of individuals of a population) and population density.
Question 8
1 / -0

Assertion : Relationship between sea anemone and hermit crab is said to be an example of obligate mutualism.

Reason : Obligate mutualism is a positive (benefical) interaction between two species.

A
If both the assertion and the reason are true and the reason is a correct explanation of the assertion

B
If both the assertion and reason are true but the reason is not a correct explanation of the assertion

C
If the assertion is true but the reason is false

D
If both the assertion and reason are false

E
If the assertion is false but reason is true

Solution

(e) The interactions between populations of species in a community are broadly categorised into positive (beneficial) and negative (inhibitory) interactions, depending upon the nature of effect on the interacting organisms. An association of two species, in which both species are benefitted, is called mutualism. Mutualism is a functional association, not merely living together. Mutualism may be obligate in which species are completely dependent upon each other, for example, in the case of coral reef, coelentrates and algae live in obligate relationship, or mutualism can be facultative in which one species may survive even in the absence of the other partner species. The relationship between sea anemone and hermit crab is an example of facultative mutualism. The sea anemone grows on the back of the crab, providing camouflage and protection (the sea anemone has stinging cells) and, in turn, the sea anemone is transported about reaching new food sources. This type of mutualism is also called protocooperation.
So, the correct answer is 'If the assertion is false but reason is true'.
Question 9
1 / -0

The carrying capacity of a population is determined by its

A
Birth rate

B
Death rate

C
Limiting resource

D
Reproductive status
Solution
In a given area, is the maximum population size of the species that the environment can sustain is called the carrying capacity.
Carrying capacity is determined by the amount of available resources (food, habitat, water).
If the amount of available resources is limiting it directly affects the carrying capacity.
So, the correct answer is 'Limiting resource'.
Question 10
1 / -0

Match the following with correct combination

Column I                         Column II

A Mutualism                   1 Tiger and deer
B Commensalism           2 Cuscuta on Cissus
C Parasitism                  3 Sucker fish and shark
D Predation 4 Crab and sea anemone

A
(a) A - 1, B - 2, C - 3, D - 4

B
(b) A - 4, B - 3, C - 2, 0 - 1

C
(c) A - 1, B - 3, C - 2, D - 4

D
(d) A - 2, B - 3, C - 1, D - 4

E
(e)A - 4, B - 2, C - 3, D - 1

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 25

Result

Organisms and Populations Test - 25

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SHARING IS CARING

Question 1

Malthus

Adam smith

Verhulst

Charles Darwin

Question 2

The number of human per unit area

The number of human in a unit area at a specific time

The concentration of human population at a place

None of above

Solution

Question 3

Availability of blood, housing and health facilities

Urbanization

Climatic conditions

All the above

Solution

Question 4

USA

India

China

Japan

Question 5

Declined growth

Exponential growth

Zero population growth

None of these

Solution

Question 6

Worming

Climent

Haeckel

Raunkiaer

Solution

Question 7

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and the reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If both the assertion and the reason are false

If the assertion is false but reason is true

Solution

Question 8

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If both the assertion and reason are false

If the assertion is false but reason is true

Solution

Question 9

Birth rate

Death rate

Limiting resource

Reproductive status

Solution

Question 10

(a) A - 1, B - 2, C - 3, D - 4

(b) A - 4, B - 3, C - 2, 0 - 1

(c) A - 1, B - 3, C - 2, D - 4

(d) A - 2, B - 3, C - 1, D - 4

(e)A - 4, B - 2, C - 3, D - 1

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