Organisms and Populations Test

Result

Organisms and Populations Test - 40

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Weekly Quiz Competition

Question 1
1 / -0

All interactions show a kind of relationship between two organisms in which one is benefited at the expense of other except

A
Competition

B
Herbivory

C
Predation

D
Parasitism

E
Commensalism

Solution

Commensalism is a type of interaction between two organisms in which one organism is benefited while the other remains unaffected from the interaction.
One of the common examples is Barnacles attached to the whales. Barnacles are sessile and they get benefit from whales which transports them and thereby helps in feeding them and in turn whales are neither harmed nor benefited with this association. Hence, the correct answer is option E.
Question 2
1 / -0

In an experiment, E. coli bacteria are spread uniformly throughout the agar petri dish. The dish was then incubated at $37^o$ C for $24$ hours.

On the completion of the experiment, most likely distribution of bacterial colonies represented by dots is shown by

A

B

C

D

E

Solution

Penicillin is an antibiotic (it is used in the treatment and prevention of bacterial infections). Penicillin inhibits the formation of peptidoglycan cross-links in the bacterial cell wall.
So, the portion (II) where the nutrient is with penicillin, there, no bacterial growth will be observed.
So, the likely distribution of bacterial colonies will be in area I in the diagram as shown in option (A). Thus, the correct answer is option A.
Question 3
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A herd of cattle was moved by a rancher to a different pasture. The carrying capacity of that pasteur exceeded is known by the fact that

A
The herd increased in size

B
The pasture became overgrazed and barren

C
The pasture had more grasses

D
The cows gained weight

E
The cows had more calves

Solution

Carrying capacity is the maximum size of the population of a species that a certain environment can support for an extended period of time. Overgrazing of pasture would make it barren. Once population overshoots the carrying capacity, it starts decreasing as at this point. An overgrazed pasture would no longer support the cattle leading them to starve or look for another food source. Thus, the correct answer is B.
Question 4
1 / -0

Due to the increased average global temperature on fish populations, the fish will show
I. Movement from saline to fresh waters
II. Movement to deeper waters
III. Movement to higher latitudes

A
I only

B
II only

C
III only

D
I and II

E
II and III

Solution

Limited or no sunlight in deeper waters keep the temperature lower in the regions making it suitable for fishes when surface water become warm due to increasing in average global temperature. Likewise, higher latitudes maintain lower temperatures due to the angle of irradiance. Salinity does not affect the temperature range of water bodies. Thus, the correct answer is E.
Question 5
1 / -0

According to the given graph, the size of the population reaches the carrying capacity for the ecosystem at time point

A
3

B
4

C
6

D
9

E
12

Solution

Carrying capacity is the maximum size of the population of a species that a certain environment can support for an extended period of time. In the graph, there is exponential increase and population size reaches its maximum at time point 12, after which there is no increase in population size. So, time point 12 represents the carrying capacity of the ecosystem. Thus, the correct answer is E.
Question 6
1 / -0

Which of the following does not cause a large number of density dependent deaths in a population?

A
Winter storms disease carrying insects

B
Disease carrying insects

C
Predators

D
Limited resources

E
Small forest fire

Solution

Density-dependent factors are the one that affects the birth and death rates of population in a density-dependent manner. These are mostly the biotic factors such as predation, competition, parasites etc. The low prey density affects the mortality of predator is a density dependent factor. Among the given options, winter storms affect the population in density independent manner as it can affect the individual organism irrespective of its population density e.g., winter storm causing the death of a deer regardless of deer population density.
So, the correct answer is option A.
Question 7
1 / -0

I. Temperature
II. Humidity
III. Vegetation
The abiotic factors of ecosystem include

A
I only

B
II only

C
III only

D
I and II only

E
I, II and III

Solution

Biotic factors of an ecosystem include all plant and animal species present in there. The abiotic factors include a physical environment in which they can survive. It includes light, temperature, humidity and other climatic condition as well as physical factors like soil. Thus, the correct answer is D.
Question 8
1 / -0

Population growth in an aquatic ecosystem can be limited by

A
Depth

B
Competition

C
Light penetration

D
Nutrient availability

E
Dissolved oxygen level

Solution

The community of living organisms along with their non-living components of the environment is termed as an ecosystem. The abiotic and biotic factors limit populations of the ecosystems. In the case of an aquatic ecosystem, competition plays a major role.
Question 9
1 / -0

Directions For Questions

The above graph depicts the average monthly temperature and precipitation in Taiyuan, China. Taiyuan's average annual temperature is $10.3$ , and its average annual precipitation is $381 mm$ , or $38.1 cm$ . The biome classification based on precipitation and temperature is shown in the graph given below.

...view full instructions

The least precipitation in Taiyuan, China is seen in the month of

A
April

B
December

C
February

D
January

E
July

Solution

According to the graph, the precipitation in Taiyuan, China is -5 mm on January, 0 mm on February, 11 mm on April, 29 mm in July. Thus, the correct answer is D.
Question 10
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What type of interaction takes place between a lion and haeyna fighting over a dead zebra?

A
Mutualism

B
Competition

C
Commensalism

D
Parasitism

E
Predation

Solution

Competition refers to interaction among organisms for the same resource. A lion and haeyna fighting over a dead zebra exhibit competition for same food resource. Mutualism is an association of organisms wherein both are benefitted while predation refers to feeding on other organisms. In parasitism, parasite derives nutrition from living host. Commensalism refers to the relationship wherein one organism is benefitted while other remains unaffected. Thus, the correct answer is B.