Organisms and Populations Test

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Organisms and Populations Test - 52

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Weekly Quiz Competition

Question 1
1 / -0

A phenomenon when parasite is dependent on another parasite is

A
Hyperparasitism

B
Parasitoids

C
Monoxenous parasitism

D
Ployxenous parasitism

Solution

A hyperparasite is a parasite whose host, often an insect, is also a parasite, often specifically a parasitoid. The most common examples are insects that lay their eggs inside or near parasitoid larvae, which are themselves parasitizing the tissues of a host, again usually an insect larva.

So, the correct answer is 'Hyperparasitism'.
Question 2
1 / -0

Carrying capacity is determined by

A
Limiting resources

B
Mortality rate

C
Natality rate

D
Predation

Solution

As a population grows in an area, a population may experience the effects of increased densities. 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 number of available resources (food, habitat, water). Carrying capacity is determined by limiting factors which affect the number of resources available. Limiting factors may include water, space, nutrients, minerals, light, etc.

So, the correct answer is 'A'.
Question 3
1 / -0

Each environment can support a limited population depending upon its

A
Biotic potential

B
Carrying capacity

C
Natality

D
Reproductive potential
Solution
Biotic potential is the maximum reproductive capacity of an organism under optimum environmental conditions.
Natality is the ratio of the number of births to the size of the population; birth rate.
The carrying capacity of a biological species in an environment is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.
So, the correct answer is 'Carrying capacity'.
Question 4
1 / -0

One species is harmed whereas the other is unaffected. Such type of interaction is called

A
Commensalism

B
Amensalism

C
Parasitism

D
Predation

Solution

Amensalism is a type of biological interaction. It is an association between two organisms if different species where one is adversely affected and the other stays unaffected.
Examples:
1. Penicillium secretes penicillin which kills bacteria
2. Streptomyces an actinomycetes inhibit the growth of bacteria. This is extracted and used as an antibiotic
3. Roots of black walnut secrete Juglone which is toxic to other plants like apple and alfalfa
4. Convolvulus arvensis inhibits the growth of wheat

So, the correct answer is 'Amensalism'.
Question 5
1 / -0

Small /suckerfish sticks to the bottom of shark to obtain food crumbs. The association is

A
Antibiosis

B
Predation

C
Commensalism

D
Parasitism

Solution

Commensalism is a long-term biological interaction (symbiosis) in which members of one species gain benefits while those of the other species neither benefit nor are harmed. The commensal relation is often between a larger host and a smaller commensal; the host organism is unmodified, whereas the commensal species may show great structural adaptation consonant with its habits, as in the remoras that ride attached to sharks and other fishes. Remoras are also known as suckerfish or shark-suckers as they are commonly found attached to the bottom of sharks hitching a ride across the oceans. The Remora grows to about 18 inches and is brownish in appearance with a flat sucker-like appendage on its head that creates a partial vacuum allowing it to attach onto turtles, sharks, tuna, dugong, and even whales. They usually travel by attaching themselves onto a larger shark or fish, and feeds off the creature’s bacteria, parasites and waste like a cleaner fish. In return, the sharks and other host creatures do not harm their traveling companions.

So, the correct answer is 'Commensalism'.
Question 6
1 / -0

Which of the following processes will be most adversely affected if microorganisms are removed from forest ecosystem?

A
Solar energy fixation and nutrient cycling

B
Decomposition of organic matter and photosynthesis

C
Nitrogen fixation and decomposition of organic matter

D
Carbon assimilation and nitrogen fixation

Solution

Nitrogen fixation is the process of fixing atmospheric nitrogen with the help of microorganisms. The atmospheric nitrogen is made available to the plant for its use. Decomposition is the process of breaking down organic matter into simpler form. This process is carried by microorganisms. Hence, if microorganisms are removed from forest system, nitrogen fixation and decomposition of organic matter will be adversely affected.
Thus, the correct answer is 'Nitrogen fixation and decomposition of organic matter.'
Question 7
1 / -0

A population growing in a habitat with limited resources shows four growth phases in the following sequence. Which of the following sequence holds good for the given condition?

A
Acceleration $$\rightarrow$$ Deceleration $$\rightarrow$$ Lag phase $$\rightarrow$$ Asymptote

B
Asymptote $$\rightarrow$$ Acceleration $$\rightarrow$$ Deceleration $$\rightarrow$$ Lag phase

C
Lag phase $$\rightarrow$$Acceleration $$\rightarrow$$ Deceleration $$\rightarrow$$ Asymptote

D
Acceleration $$\rightarrow$$ Lag phase $$\rightarrow$$ Deceleration $$\rightarrow$$ Asymptote

Solution

There are 4 types of growth phases in any type of population growth. If the resources required by a population are in limited amounts, the growth is very slow initially. Then it increases rapidly followed by a slow increase in population. After this, the population declines and then remains stable. So, the growth phases will start with the lag phase, followed by the acceleration in growth, then deceleration of growth and finally, it gets asymptote.
So, option C is the correct answer.
Question 8
1 / -0

There are two ways of exploitation. One way is parasitism which is the other one

A
Antibodies

B
Competition

C
Predation

D
Commensalism

Solution

Predation is a type of environmental interaction in which the prey is caught and destroyed by the predator. So apart from parasitism, predation is a way of exploitation.
So, option C is the correct answer.
Question 9
1 / -0

Browsing of animals is an example of

A
Commensalism

B
Predation

C
Parasitism

D
Amensalism

Solution

All the herbivores that feed on plants and vegetation can either be browsers or grazers. Browsers are the ones that feed on fruits, stems and high end branches of soft plants and Woody stems. While grazers are the ones that feed mostly on ground vegetation. So, browsing can be said to be a type of predation.
So, option B is the correct answer.
Question 10
1 / -0

The most important factor which determined the increase in human population in India during 20$$^{th}$$ century has been

A
Mortality

B
Immigration

C
Emigration

D
Natality

Solution

One of the most important problems that our country is facing currently is the population explosion. There is a direct need to stop the population explosion and curb the ever increasing population. Increase in birth rate and natality is one of the common reasons for population explosion. It is because of increased standard of living and better medical and health care facilities that the natality rate is increasing. So, the most important factor determining population explosion is natality.
So, option D is the correct answer.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 52

Result

Organisms and Populations Test - 52

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SHARING IS CARING

Question 1

Hyperparasitism

Parasitoids

Monoxenous parasitism

Ployxenous parasitism

Solution

Question 2

Limiting resources

Mortality rate

Natality rate

Predation

Solution

Question 3

Biotic potential

Carrying capacity

Natality

Reproductive potential

Solution

Question 4

Commensalism

Amensalism

Parasitism

Predation

Solution

Question 5

Antibiosis

Predation

Commensalism

Parasitism

Solution

Question 6

Solar energy fixation and nutrient cycling

Decomposition of organic matter and photosynthesis

Nitrogen fixation and decomposition of organic matter

Carbon assimilation and nitrogen fixation

Solution

Question 7

Acceleration $$\rightarrow$$ Deceleration $$\rightarrow$$ Lag phase $$\rightarrow$$ Asymptote

Asymptote $$\rightarrow$$ Acceleration $$\rightarrow$$ Deceleration $$\rightarrow$$ Lag phase

Lag phase $$\rightarrow$$Acceleration $$\rightarrow$$ Deceleration $$\rightarrow$$ Asymptote

Acceleration $$\rightarrow$$ Lag phase $$\rightarrow$$ Deceleration $$\rightarrow$$ Asymptote

Solution

Question 8

Antibodies

Competition

Predation

Commensalism

Solution

Question 9

Commensalism

Predation

Parasitism

Amensalism

Solution

Question 10

Mortality

Immigration

Emigration

Natality

Solution

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