Organisms and Populations Test

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Organisms and Populations Test - 68

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Weekly Quiz Competition

Question 1
1 / -0

When a person dies in old age after completing the life span, then, the survivorship curve for that person is:-

A
J -shape

B
Concave

C
S-shaped

D
Convex
Solution
Survivorship curves are the graphs or curves that depict the survival of the number of individuals according to age or time. It of three types:
Type 1 - It shows that the individual has a high chance of survival until adulthood. It can normally complete the life cycle and the curve is called a convex curve.
Type 2 - It shows that the survival of an individual is not dependent upon the age.
Type 3 - It shows that the individual has fewer chances of survival and dies at an early age.
So, the correct option is 'Convex'.
Question 2
1 / -0

A sedentary sea anemone gets attached shell lining of hermit crab. The association of?

A
Amensalism

B
Ectoparasitism

C
Symbiosis

D
Commensatism
Question 3
1 / -0

Which of the following statements is correct?

A
The number of organisms can decrease but never increase once a population reaches its carrying capacity.

B
All populations experience exponential growth once they reach carrying capacity.

C
A population always grows rapidly once it reaches its carrying capacity.

D
Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity.
Question 4
1 / -0

Co-evolution can be observed in case of :

A
Mutualisin, parasitism

B
Predation, parasitism

C
Amensalism, competition

D
Competition, commensalism

Question 5

1 / -0

Following table summarizes the differences between natality and mortality. Select the incorrect ones.

	Natality	Mortality
(i)	Natality is number of births per unit population per unit time.	It is number of deaths per unit population per unit time.
(ii)	It adds new individuals to the population.	It removes individuals from the population.
(iii)	It increases the size of population.	It decreases the size of population.
(iv)	It increases population density.	It reduces population density.
(v)	It is low when population size is small and high when population size is large.	It is high when population size is small and low when population size is large.

(i) and (v)

(iii) and (iv)

(iv) only

(v) only

Question 6
1 / -0

Which of the following abiotic factors has sedimentary cycle?

A
Oxygen

B
Carbon

C
Phosphorus

D
Nitrogen
Question 7
1 / -0

The parasitism in which the parasites steal food gathered by the host is _______.

A
Kleptoparasitism

B
Adelpho-parasitism

C
Hyperparasitism

D
Brood parasitism
Question 8
1 / -0

According to scientists, estimation of emission is difficult because it depends on the

A
Population changes

B
Technological changes

C
Social changes

D
All of the above
Question 9
1 / -0

Which of the following statements is correct?

A
The number of organisms can decrease but never increase once a population reaches its carrying capacity

B
All populations experience exponential growth once they reach carrying capacity

C
A population always grows rapidly once it reaches its carrying capacity

D
Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity

Solution

Answer :
i) Carrying Capacity-when the number of births equals the number of deaths, the population is at its carrying capacity for that habitat.
ii) If resources are being used faster than they are being replenished, then the species has firstly exceeded its carrying capacity.
iii) If this occurs, later the population will then decrease in size due to intraspecific competition for resources.

So the correct answer is option D. Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity.
Question 10
1 / -0

Match for M and N with species-area relationship shown in the graphic representation below and choose the correct option.

A
$$M\rightarrow S={ CA }^{ Z },\quad N\rightarrow log\,S=log\,C+Zlog\,A\quad $$

B
$$M\rightarrow S={ CZ }^{ A },\quad N\rightarrow log\,C=log\,S+Zlog\,A\quad $$

C
$$M\rightarrow S={ CA }^{ Z },\quad N\rightarrow log\,S=log\,C+Alog\,Z\quad $$

D
$$M\rightarrow S={ AZ }^{ C },\quad N\rightarrow log\,ZA=log\,C+log\,S\quad $$

Solution

The species–area relationship describes the relationship between the area of a habitat and the number of species found within that area.
So, the correct answer is 'M→S=CAZ,N→logS=logC+ZlogA

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 68

Result

Organisms and Populations Test - 68

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SHARING IS CARING

Question 1

J -shape

Concave

S-shaped

Convex

Solution

Question 2

Amensalism

Ectoparasitism

Symbiosis

Commensatism

Question 3

The number of organisms can decrease but never increase once a population reaches its carrying capacity.

All populations experience exponential growth once they reach carrying capacity.

A population always grows rapidly once it reaches its carrying capacity.

Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity.

Question 4

Mutualisin, parasitism

Predation, parasitism

Amensalism, competition

Competition, commensalism

Question 5

(i) and (v)

(iii) and (iv)

(iv) only

(v) only

Question 6

Oxygen

Carbon

Phosphorus

Nitrogen

Question 7

Kleptoparasitism

Adelpho-parasitism

Hyperparasitism

Brood parasitism

Question 8

Population changes

Technological changes

Social changes

All of the above

Question 9

The number of organisms can decrease but never increase once a population reaches its carrying capacity

All populations experience exponential growth once they reach carrying capacity

A population always grows rapidly once it reaches its carrying capacity

Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity

Solution

Question 10

$$M\rightarrow S={ CA }^{ Z },\quad N\rightarrow log\,S=log\,C+Zlog\,A\quad $$

$$M\rightarrow S={ CZ }^{ A },\quad N\rightarrow log\,C=log\,S+Zlog\,A\quad $$

$$M\rightarrow S={ CA }^{ Z },\quad N\rightarrow log\,S=log\,C+Alog\,Z\quad $$

$$M\rightarrow S={ AZ }^{ C },\quad N\rightarrow log\,ZA=log\,C+log\,S\quad $$

Solution

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