Organisms and Populations Test

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Organisms and Populations Test - 54

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Weekly Quiz Competition

Question 1

1 / -0

	I		II
(a)	Mutualism	(1)	Ticks on dogs
(b)	Commensalism	(2)	Balance and Chathamalus
(c)	Parasitism	(3)	Sparrow and any seed
(d)	Competition	(4)	Epiphyte on a mango branch
(e)	Predation	(5)	Ophrys and bees

Match the columns and choose the correct combination

a - 1 , b - 5 , c - 4 , d - 3 , e - 2

a - 2 , b - 1 , c - 5 , d - 4 , e - 3

a - 3, b - 2 , c - 1 , d - 5 , e - 4

a - 5 , b - 4 , c - 1 , d - 2 , e - 3

Solution

a) Ophrys and bee exhibits mutualism relationship as both of them are benefitted.

b) The interaction presents between the orchid and the mango tree is an example of commensalism.

c) Ticks on dogs is present due to parasitic infections. It is due to the assocaiation known as parasitism.

d) Balanus and chthamalus exhibits competition. Balanus can out-compete Chthamalus by crowding but Chthamalus can occupy higher tide levels than Balanus.

e) Sparrows feeds on any kind of plant seeds leading to seed inviability. This relationship is called predation.

Question 2
1 / -0

Grazing benefits the grasses. The term for this interaction should be

A
Commensalism

B
Predation

C
Mutualism

D
Amensalism

Solution

Grasses and grazers have evolved mutualism to the extent that one group would not have been possible without the other. The recent discovery (Dyer 1980) that saliva produced by grazers stimulates grass growth is interpreted as a mutualistic adaptation by which both grass and grazer benefit. Other such adaptations include a basal meristem which is out of reach of most grazers, high palatability of grass leaves and shoots and vegetative reproduction, all of which, we suggest, are responses to selection by grazers and which increase the fitness of individual grass plants.

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

Which one is not a parasitic adaptation?

A
Loss of digestive organs

B
Loss of reproductive capacity

C
Loss of unnecessary sense organs

D
Development of adhesive organs

Solution

Parasitic existence leads to the loss of organs and attainment of new structures which helps in food absorption, protection, attachment and vast reproduction.
So, there won't be any loss in the reproductive capacity.
Question 4
1 / -0

Carrying capacity of an environment for a given population is

A
$$\dfrac{dN}{dt}=rN(1-\dfrac{N}{K})$$

B
$$dN=rN-\dfrac{N}{K}$$

C
$$\dfrac{dN}{dt}=rN-\dfrac{N}{K}$$

D
$$\dfrac{dN}{dt}=rN-\dfrac{1}{k}$$
Question 5
1 / -0

Number of individuals of a population who left habitat and gone elsewhere constitute

A
Natality

B
Mortality

C
Emigration

D
Immigration

Solution

Natality in population ecology is the scientific term for birth rate.
(ii) Mortality is the number of deaths in the population during a given period.
(iii) Immigration is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration.
(iv) Emigration is the number of individuals of the population who left the habitat and gone elsewhere during the time period under consideration.

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

Abingation tortoise in Galapagos islands became extinct after goats with great browsing efficiency were introduced . In is an example of

A
Competitive release

B
Co-existence

C
Interferance competition

D
Competitive exclusion

Solution

The Abingdon Tortoise in Galapagos Islands became extinct within a decade only after goats were introduced on the Island. It is an example of competitive exclusion. It happened due to the greater browsing efficiency of the goats.
So the correct option is D.
Question 7
1 / -0

If two species compete for the same resource and avoid competition by choosing different times for feeding or different forage pattern, it is

A
Resource partition

B
Competitive release

C
Mutualism

D
Commensalism

Solution

Resource partition is the phenomenon in which two species compete for same resource, they could avoid competition by choosing different times for feeding or different foraging patterns.
Question 8
1 / -0

An orchid growing as an epiphyte on a mango tree is an example of

A
Parasitism

B
Predation

C
Commensalism

D
Mutualism

E
Competition

Solution

An orchid growing on the branch of a mango tree is an epiphyte. Epiphytes are plants growing on other plants which, however, do not derive nutrition from them. Therefore, the relationship between a mango tree and an orchid is an example of commensalisms, where one species gets benefited while the other remains unaffected. In the above interaction, the orchid is benefited as it gets support while the mango tree remains unaffected.

So, the correct answer is 'C'.
Question 9
1 / -0

Commensalism is a symbiotic relationship between two organisms where

A
Both partners benefit

B
One partner benefit and causes harm to other

C
One partner benefits and the other receives no harm

D
Both partners are disadvantaged

Solution

Commensalism is a long-term biological interaction in which members of one species gain benefits while those of the other species neither benefit nor are harmed. In other words, this is a one-sided symbiotic relationship. The relationship between tigers and golden jackals is also commensalism. The jackal alerts the tiger to a kill and feeds on the remains of the prey left by the tiger.

So, the correct answer is 'C'.
Question 10
1 / -0

I II III
(I) Crab Sacculina Interaction ++
(II) Human Being Mosquito Interaction -+
(II) Sea Anemone Hermit Crab Interaction +O
Find the incorrect match

A
i only

B
ii and iii

C
iii and i

D
ii only

Solution

Sacculina is a variety of crab. So, there is no possibility to have an interaction between the same variety of organisms.
Option (i) is the wrong one.
So the correct option is A.

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Re-Attempt Weekly Quiz Competition

	I	II	III
(I)	Crab	Sacculina	Interaction ++
(II)	Human Being	Mosquito	Interaction -+
(II)	Sea Anemone	Hermit Crab	Interaction +O

Organisms and Populations Test - 54

Result

Organisms and Populations Test - 54

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SHARING IS CARING

Question 1

a - 1 , b - 5 , c - 4 , d - 3 , e - 2

a - 2 , b - 1 , c - 5 , d - 4 , e - 3

a - 3, b - 2 , c - 1 , d - 5 , e - 4

a - 5 , b - 4 , c - 1 , d - 2 , e - 3

Solution

Question 2

Commensalism

Predation

Mutualism

Amensalism

Solution

Question 3

Loss of digestive organs

Loss of reproductive capacity

Loss of unnecessary sense organs

Development of adhesive organs

Solution

Question 4

$$\dfrac{dN}{dt}=rN(1-\dfrac{N}{K})$$

$$dN=rN-\dfrac{N}{K}$$

$$\dfrac{dN}{dt}=rN-\dfrac{N}{K}$$

$$\dfrac{dN}{dt}=rN-\dfrac{1}{k}$$

Question 5

Natality

Mortality

Emigration

Immigration

Solution

Question 6

Competitive release

Co-existence

Interferance competition

Competitive exclusion

Solution

Question 7

Resource partition

Competitive release

Mutualism

Commensalism

Solution

Question 8

Parasitism

Predation

Commensalism

Mutualism

Competition

Solution

Question 9

Both partners benefit

One partner benefit and causes harm to other

One partner benefits and the other receives no harm

Both partners are disadvantaged

Solution

Question 10

i only

ii and iii

iii and i

ii only

Solution

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