Organisms and Populations Test

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Organisms and Populations Test - 1

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Weekly Quiz Competition

Question 1
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The association between a barnacle and a blue whale can be rightly said as:

A
Ammensalism

B
Mutualism

C
Predation

D
Commensalism

Solution

The symbiotic relationship between a barnacle and a whale is known as commensalism, which describes an inter-species interaction that benefits at least one participant. Whales do not gain a significant benefit from the presence of barnacles on their bodies. However, their presence is not especially damaging or harmful to the whales either. Barnacles, on the other hand, gain a tremendous advantage from their partnership with whales. By attaching themselves to the belly, back and sides of whales, they enable themselves to hitch a free ride through nutrient-rich water environments. This allows barnacles to consume micro-organisms that float freely in the water, which would otherwise be inaccessible to the barnacles.
Question 2
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In a relationship between prickly pear and moth,

A
moth is harmed

B
prickly pear is harmed

C
prickly pear is benefitted

D
both prickly pear and moth are benefitted

Solution

Moth threatens the population of prickly pear; thus prickly pear is harmed. Moth is used as a biological control agent for prickly pear.
Question 3
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Production and storage of toxin to keep away predators is used by:

A
Opuntia

B
Acacia

C
Calotropis

D
Papaver

Solution

Calotropis produces and stores a toxin to keep away the predators. Cattle often stay away from the plants because of their unpleasant taste and their content of cardiac glycosides. The milky latex sap of Calotropis is a known cause of toxic keratoconjunctivitis and reversible vision loss.
Question 4
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Camouflage for defence to lessen the impact of predation is observed in

A
fungi and algae

B
monarch butterflies and dead butterflies

C
frogs and monarch butterflies

D
frogs and insects

Solution

Frogs and most of the insects camouflage to lessen the impact of predation.
Question 5
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Allen's rule is visible in which of the following organisms?

A
Kangaroo rats

B
Desert lizards

C
Polar bears

D
Desert plants

Solution

According to Allen's rule, cold climate mammals have short ears and limbs to minimise heat loss. This is visible in polar bears. Polar bear is a cold climate mammal which has short ears and limbs.
Question 6
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Spontaneous reduction in development process and metabolism to deal with the stressful condition is observed in:

A
Zooplankton

B
Polar bears

C
Snails

D
Seeds

Solution

To deal with stressful situations diapause, i.e. spontaneous reduction in development process and metabolism is observed in zooplankton.
Question 7
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Salmon and coral reefs respectively are

A
thermophilic and cryophilic

B
cryophilic and thermophilic

C
stenothermal and eurythermal

D
Both are eurythermal organisms.

Solution

Salmon are cryophilic, i.e. they thrive at low temperature; whereas coral reefs are thermophilic, i.e. they thrive at high temperature.
Question 8
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Mortality is the number of deaths in an area

A
to the number of births in the area

B
per unit area

C
per 1000 individuals

D
to the total population of the area

Solution

Mortality is the ratio of the number of deaths in an area to the total population of the area. It is expressed as the loss of individuals with respect to the members of the population.
Question 9
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A population pyramid with extremely low percentage of younger population reflects

A
high death rate and high birth rate

B
low death rate and high life expectancy

C
low death rate and low birth rate

D
high birth rate and low life expectancy

Solution

A population pyramid with extremely low percentage of younger population reflects low death rate and low birth rate. Such pyramids are constrictive pyramids. It is typical for a highly developed country.
Question 10
1 / -0

Least concentration of clay is seen in

A
clayey soil

B
sandy-loam soil

C
clay-loam soil

D
silt-loam soil

Solution

Sandy-loam soil has 20% clay.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 1

Result

Organisms and Populations Test - 1

Score

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Rank

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SHARING IS CARING

Question 1

Ammensalism

Mutualism

Predation

Commensalism

Solution

Question 2

moth is harmed

prickly pear is harmed

prickly pear is benefitted

both prickly pear and moth are benefitted

Solution

Question 3

Opuntia

Acacia

Calotropis

Papaver

Solution

Question 4

fungi and algae

monarch butterflies and dead butterflies

frogs and monarch butterflies

frogs and insects

Solution

Question 5

Kangaroo rats

Desert lizards

Polar bears

Desert plants

Solution

Question 6

Zooplankton

Polar bears

Snails

Seeds

Solution

Question 7

thermophilic and cryophilic

cryophilic and thermophilic

stenothermal and eurythermal

Both are eurythermal organisms.

Solution

Question 8

to the number of births in the area

per unit area

per 1000 individuals

to the total population of the area

Solution

Question 9

high death rate and high birth rate

low death rate and high life expectancy

low death rate and low birth rate

high birth rate and low life expectancy

Solution

Question 10

clayey soil

sandy-loam soil

clay-loam soil

silt-loam soil

Solution

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