Organisms and Populations Test

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Organisms and Populations Test - 38

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Weekly Quiz Competition

Question 1
1 / -0

What is mycorrhizae?

A
Plants that have no vascular tissue

B
Nitrogen-fixing bacteria that live in nodules on the roots of legumes

C
Primitive plants like mosses, which show a dominant gametophyte stage

D
Vascular bundles in the stems of tracheophytes

E
Symbiotic structures living in the roots of plants that increase uptake of nutrients from the soil

Solution

Mycorrhizae is a symbiotic association between a fungus and the roots of a vascular plant. The major function of mycorrhizae is to exchange nutrients between their surroundings and their host plant. With the increase in root surface area and the protection they offer to the plant's roots, the fungus is able to acquire a lot of nutrients for its host.
Therefore, the correct answer is option E.
Question 2
1 / -0

What type of interaction takes place between two animals fighting over same food?

A
Mutualism

B
Competition

C
Commensalism

D
Parasitism

E
Predation

Solution

Competition is a form of interaction in which individuals compete for the same resource in an ecosystem (e.g. food or living space). It can be of two types - intraspecific competition and interspecific competition. Hence, option B is correct.
There are other types of interactions as well:
1. Predation - When an organism kills and eats another organism.
2. Parasitism - Where parasite lives in the body of hosts and obtains food without immediately killing the host.
3. Mutualism- It is the cooperative interaction between two species in which both species benefits each other.
4. Commensalism- It is an interaction in which one species is benefitted and another one is neither harmed nor benefitted.
Question 3
1 / -0

What type of curve is shown by the graph?

A
Biotic potential curve

B
Carrying capacity

C
Density-dependent curve

D
Density-independent curve

E
Sigmoid curve
Question 4
1 / -0

A relationship in which one organism is benefited while other is neither benefited nor harmed is known as

A
Commensalism

B
Mutualism

C
Parasitism

D
Symbiosis

Solution

Commensalism is a type of interaction among two organisms where one organism is benefited whereas other remains unaffected (neither harmed nor benefited). The common example of commensalism is Barnacles which are sessile and does not move by its own, they get attached to the sides of whales and in turns transport to different places which helps them in feeding. Barnacles are benefited because of this association whereas whales remains unaffected. Thus, the correct answer is option A.
Question 5
1 / -0

Which of the following explains, two dogs fighting for one bone?

A
Exploitative and interspecific competition

B
Interference and intraspecific competition

C
Exploitative and intraspecific competition

D
Exploitative and interference competition

E
Interference and interspecific competition

Solution

Interference refers to the competition for scarce resources when organisms interact directly; in the given example, two dogs (competition between members of same species i.e. intraspecific) are fighting for a bone making it an interference and intraspecific competition. Exploitative competition occurs when organisms interact indirectly for a scarce resource. Thus, the correct answer is option B.
Question 6
1 / -0

A population of aphids feed on the leaves of a host plant that produces a toxin. Within a time span, some aphids become immune to the toxin. The host plant produces another toxin that is lethal to aphids. Such kind of association is known as

A
Parasitism

B
Commensalism

C
Predation

D
Mutualism

E
Coevolution

Solution
Question 7
1 / -0

Even, clumped or random represents which property of the population?

A
Habitat

B
Dispersion

C
Size

D
Density

E
Growth rate

Solution

The demographic study is based on the estimation of the several factors related to a population. Dispersion plays an important role in determining the in demographic studies and indicates the distribution of species in a particular area. Individuals of a population can be distributed in one of three basic patterns, they can be more or less equally spaced apart (uniform dispersion), dispersed randomly with no predictable pattern (random dispersion), or clustered in groups (clumped dispersion).
So, the correct answer is option B.
Question 8
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Competition between members of a prairie dog population could be expected to increase as a result of an increase in the

A
Prairie dog intrinsic reproductive rate

B
Spread of disease among the prairie dogs

C
Mortality rate of prairie dogs

D
Natality rate of prairie dog predators

E
Number of secondary consumers

Solution

Competition between members of a prairie dog population could be expected to increase as a result of an increase in the prairie dog intrinsic reproductive rate.
The rate at which a population increases in size if there are no density-dependent forces regulating the population is known as the intrinsic rate of increase. Competition is an interaction between organisms or species in which the fitness of one is lowered by the presence of another. A limited supply of at least one resource (such as food, water, and territory) used by both can be a factor. In short, when the number of prairie dogs increases, more requirement of natural resources including food, water and so on. Higher the population of the animal, higher the demand. This affects the population.
Question 9
1 / -0

Which of the following is the advantage of social dominance hierarchies?
I. keep lowers on the pecking order from being abused.
II. Reduce interference competition.
III. keep organisms that are closely related closer together.

A
I is true.

B
II is true.

C
III is true.

D
I and II are both true.

E
I and III are both true.
Solution
The social dominance hierarchy, helps in maintaining a respective order.
The hierarchies limit the amount of violence taking place within a group.
The social hierarchy is beneficial in the maintenance of territories.
It helps in preventing the intruders to invade the territory and harm the individuals thereby reducing interference competition. Thus, the correct answer is option B.
Question 10
1 / -0

Which of the following best represents the human population, from stone age times to the present?

A
An exponential growth curve

B
A logistic growth curve

C
A bimodel distribution curve

D
A normal distribution curve

E
A random growth curve

Solution

The world’s human population displays exponential growth as the population is growing at an exponential rate. Exponential growth is also known as geometric or compound-interest growth). Exponential growth takes place when the per capita growth rate of the population remains the same, regardless of the population size where the population grows faster and faster as it gets larger.
So, the correct answer is 'An exponential growth curve'

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 38

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Organisms and Populations Test - 38

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SHARING IS CARING

Question 1

Plants that have no vascular tissue

Nitrogen-fixing bacteria that live in nodules on the roots of legumes

Primitive plants like mosses, which show a dominant gametophyte stage

Vascular bundles in the stems of tracheophytes

Symbiotic structures living in the roots of plants that increase uptake of nutrients from the soil

Solution

Question 2

Mutualism

Competition

Commensalism

Parasitism

Predation

Solution

Question 3

Biotic potential curve

Carrying capacity

Density-dependent curve

Density-independent curve

Sigmoid curve

Question 4

Commensalism

Mutualism

Parasitism

Symbiosis

Solution

Question 5

Exploitative and interspecific competition

Interference and intraspecific competition

Exploitative and intraspecific competition

Exploitative and interference competition

Interference and interspecific competition

Solution

Question 6

Parasitism

Commensalism

Predation

Mutualism

Coevolution

Solution

Question 7

Habitat

Dispersion

Size

Density

Growth rate

Solution

Question 8

Prairie dog intrinsic reproductive rate

Spread of disease among the prairie dogs

Mortality rate of prairie dogs

Natality rate of prairie dog predators

Number of secondary consumers

Solution

Question 9

I is true.

II is true.

III is true.

I and II are both true.

I and III are both true.

Solution

Question 10

An exponential growth curve

A logistic growth curve

A bimodel distribution curve

A normal distribution curve

A random growth curve

Solution

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