Organisms and Populations Test

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Organisms and Populations Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

A bird introduced from another country became a serious pest due to the

A
Better adaptation to new area

B
More sexual reproduction

C
Better nesting habitats

D
Absence of natural competition

Solution

There is no natural competition organisms in this case. The bird is coming from a different country, so its habits and behaviour will be quite different from those already living there.
So, option D is the correct answer.
Question 2
1 / -0

Which one is true ?

A
Commensalism when neither populations affect each other

B
Symbiosis when the interaction is useful to both the populations

C
Symbiosis when neither populations affects each other

D
Commensalism when the interaction is useful to both the populations

Solution

Symbiosis is a mutually beneficial relationship between two different organisms that lives with a close physical association. It advantages both the organisms as a mutually beneficial relationship.
Whereas, Commensalism is a relationship in which one organism is benefited and the other is neither harmed nor benefited.
Question 3
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An example of mutualism is

A
Riccia

B
Selaginella

C
Lichen

D
Spirogyra

Solution

In lichens, algae and fungi live in symbiotic association with each other. Algae provides food and fungi provides shelter to algae. So, both the organisms are benefited.
So, option C is the correct answer.
Question 4
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Remora-Shark relationship is

A
Symbiosis

B
Parasitism

C
Predation

D
Commensalism

Solution

Remora fish attaches itself to the body of shark. This makes its transport easy. Apart from this, it also gets food from shark. So, Remora is benefited and shark is neither benefited nor harmed.
So, option D is the correct answer.
Question 5
1 / -0

Which of the following is not a characteristic of intestinal symbiosis?

A
Feeding on extra food of host

B
Providing vitamins to host

C
Anaerobic respiration

D
Aerobic respiration

Solution

Intestinal symbiosis initiates the process of digestion and helps to receive nutrition by degrading the polysaccharides in the host. one of the bacteria present in small intestine is Escherichia coli bacteria. It feeds on the waste food in the host. It provides nutrition and vitamins to the host. It degrades the food by breakdown of complex food by the process of anaerobic respiration. So, aerobic respiration does not take place.
So, option D is the correct answer.
Question 6
1 / -0

Rhizobium bacteria and root nodules of Pea have an association called

A
Predation

B
Parasitism

C
Symbiosis

D
Commensalism

E
Scavenging

Solution

There is a symbiotic relationship between the legumes which contains root nodules and Rhizobium bacteria.
Rhizobia live in the soil. When there is limited soil nitrogen, legumes in symbiotic relationship release flavanoids which sends signal to rhizobia that the plant needs symbiotic bacteria. Rhizobia produces ammonia from the atmospheric nitrogen and assists the plant's growth.
Question 7
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Relationship between two organisms in which one obtains some benefits at the cost of other is

A
Parasitism

B
Predation

C
Symbiosis

D
Scavenging

E
Commensalism

Solution

Parasitism is a type of population interaction in which one organism lives on or inside another organism. The former is a parasite and the latter is a host. Parasite thrives on the food of the host and takes away its nutrition. Thus the parasite benefits. But the host is harmed.
So, option A is the correct answer.
Question 8
1 / -0

A matching pair is

A
Shark and sucker fish-commensalism

B
Algae and Fungi in Lichens -Mutualism

C
Orchids growing on trees -Parasitism

D
Cuscuta (Dodder) growing on other flowering plants -Epiphytism

Solution

Lichen has a stable symbiotic association between a fungus and an algae and/or cyanobacteria. This kind of symbiotic relationship is called Mutualism. Lichens require carbon as a food source, it is provided by their symbiotic photosynthetic algae. These algae are called photobionts that can produce simple sugars by photosynthesis.
So the correct option is B.
Question 9
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Association between Barnacles and Whale /Limulus is

A
Symbiosis

B
Commensalism

C
Parasitism

D
Predatorship

Solution

Commensalism is a type of population interaction in which one organism is benefitted and another is neither harmed nor benefitted. Barnacules attach themselves to whale's body, move with it and eat microorganisms. So they are benefitted. Whereas whale's are neither had nor benefitted.
So, option B is the correct answer
Question 10
1 / -0

Two species competing exactly for same resources can not live in the same niche due to

A
Allen's Law

B
Gause hypothesis

C
Doll's Rule

D
Weismann's theory

Solution

According to Gause's hypothesis, if two species compete for the same resources they cannot live together This is because they will compete with each other for want of resources and ultimately only one of them can survive.
So, option B is the correct answer.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 49

Result

Organisms and Populations Test - 49

Score

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SHARING IS CARING

Question 1

Better adaptation to new area

More sexual reproduction

Better nesting habitats

Absence of natural competition

Solution

Question 2

Commensalism when neither populations affect each other

Symbiosis when the interaction is useful to both the populations

Symbiosis when neither populations affects each other

Commensalism when the interaction is useful to both the populations

Solution

Question 3

Riccia

Selaginella

Lichen

Spirogyra

Solution

Question 4

Symbiosis

Parasitism

Predation

Commensalism

Solution

Question 5

Feeding on extra food of host

Providing vitamins to host

Anaerobic respiration

Aerobic respiration

Solution

Question 6

Predation

Parasitism

Symbiosis

Commensalism

Scavenging

Solution

Question 7

Parasitism

Predation

Symbiosis

Scavenging

Commensalism

Solution

Question 8

Shark and sucker fish-commensalism

Algae and Fungi in Lichens -Mutualism

Orchids growing on trees -Parasitism

Cuscuta (Dodder) growing on other flowering plants -Epiphytism

Solution

Question 9

Symbiosis

Commensalism

Parasitism

Predatorship

Solution

Question 10

Allen's Law

Gause hypothesis

Doll's Rule

Weismann's theory

Solution

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