Organisms and Populations Test

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Organisms and Populations Test - 59

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Weekly Quiz Competition

Question 1
1 / -0

Choose the correct from the alternatives given.
A stronger species being benefited at the cost of weak species is an example of:

A
predation

B
commensalism

C
parasitism

D
proto-cooperation

Solution

A.Predation refers to an interaction between two organisms, predator and prey, where there is a flow of energy from one to another. The prey usually suffers a loss of energy and fitness, with a commensurate gain in energy for the predator.
B.Commensalism - an association between two organisms in which one benefits and the other derives neither benefit nor harm
C.Parasitism relationship between two species of plants or animals in which one benefits at the expense of the other, sometimes without killing the host organism.
D.Proto cooperation - two species interact with each other beneficially; they have no need to interact with each other - they interact purely for the gain that they receive from doing this.
So the correct option is 'predation'.
Question 2
1 / -0

Is an interspecific association in which all species involved benefit.

A
Commensalism

B
Mutualism

C
Competition

D
Parasitism

Solution

A.Commensalism - an association between two organisms in which one benefits and the other derives neither benefit nor harm
B.Mutualism is an association between organisms of two different species in which each benefits. Mutualistic arrangements are most likely to develop between organisms with widely different living requirements. Mutualism plays a key part in ecology. Measuring the exact fitness benefit to the individuals in a mutualistic relationship is not always straightforward, particularly when the individuals can receive benefits from a variety of species.
C.Competition - the activity or condition of striving to gain or win something by defeating or establishing superiority over others.
D.Parasitism - relationship between two species of plants or animals in which one benefits at the expense of the other, sometimes without killing the host organism.
So the correct option is 'mutualism'.
Question 3
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Which one of the following is an example of mutualism

A
Lichens

B
Hypertrophy

C
Cuscuta

D
Nepenthes

Solution

A.Lichens - Mutualism - symbiosis which is beneficial to both organisms involved.

B.Hypertrophy - Growth - increase in size of skeletal muscle through a growth in size of its component cells.

C.Cuscuta - Parasitism - relationship between two species of plants or animals in which one benefits at the expense of the other, sometimes without killing the host organism

D.Nepenthes - insectivorous plant - carnivore - an animal that gets food from killing and eating other animals.

So the correct option is 'lichens'.
Question 4
1 / -0

Mutualism is an interaction between two species in which

A
Both are benefited

B
Both are harmed

C
One is benefited and the other is harmed

D
One is benefited and the other is neither benefited nor harmed

Solution

is a relationship between organisms in which both species involved benefit to some extent with neither species being harmed
So the correct option is 'both are benefited'.
Question 5
1 / -0

Which of the following is a commensalistic relationship?

A
Plasmodium-humans

B
Epiphytes-trees

C
Human colon bacteria-humans

D
HIV-humans

Solution

Commensalism is a relationship between two organism in which one receives benefits from the other and the other is not affected by it.the species is neither harmed nor benefitted.
A good example of this is the epiphytes and the tress.
So, the correct option is 'Epiphytes-trees'
Question 6
1 / -0

Choose the correct answers from the alternatives given.
Human population growth curve is a

A
J-shaped curve

B
zig-zag curve

C
parabola curve

D
S-shaped curve

Solution

The growth of human beings in their natural environment is characterised by an S-shaped curve called sigmoid growth curve. This curve is divided into three phases – lag phase, log phase or exponential phase of rapid growth, and stationary phase.
Question 7
1 / -0

The carrying capacity of a population is determined by its ?

A
limiting resources

B
natality

C
mortality

D
population growth rate

Solution

The carrying capacity of an environment refers to the maximum number of organisms that it can support. It is usually denoted by a K and is determined by a limited availability of resources like food and space.
So, the correct answer is 'limiting resources'
Question 8
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Which two of the given points are known as the twin characteristics of growth?
(i) Increase in mass
(ii) Increase in number of individuals
(iii) Cellular organisation
(iv) Cellular differentiation.

A
(i) and (ii)

B
(i) and (iii)

C
(ii) and (iii)

D
(iii) and (iv)

Solution

Increase in body mass (by cell division) and increase in number of individuals by reproduction are considered as twin characteristics of growth.
Question 9
1 / -0

Among the following organisms which is a completely non-parasitic form?

A
Sea anemone

B
Tapeworm

C
Leech

D
Mosquito

Solution

Sea anemone is not parasitic. It shows mutualism with hermit crab. Tapeworm is an endoparasite while leech and mosquito are exoparasites. Hence the correct option is A.
Question 10
1 / -0

The exponential growth can be mathematically expressed as

A
$$L_t\,=\,L_0\,+\,rt$$

B
$$W_1\,=\,W_0\,+\,e^{rt}$$

C
$$W_1\,=\,W_0e^{rt}$$

D
$$L_t\,=\,L_0\,-\,rt$$

Solution

The exponential growth can be mathematically expressed as
W$$_1$$ = W$$_0$$e$$^{rt}$$
Where, W$$_1$$ is the growth after time t
W$$_0$$ is the initial population
e Euler's number is a mathematical constant.
r is the growth rate through time t
So, the correct answer is 'C'

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 59

Result

Organisms and Populations Test - 59

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SHARING IS CARING

Question 1

predation

commensalism

parasitism

proto-cooperation

Solution

Question 2

Commensalism

Mutualism

Competition

Parasitism

Solution

Question 3

Lichens

Hypertrophy

Cuscuta

Nepenthes

Solution

Question 4

Both are benefited

Both are harmed

One is benefited and the other is harmed

One is benefited and the other is neither benefited nor harmed

Solution

Question 5

Plasmodium-humans

Epiphytes-trees

Human colon bacteria-humans

HIV-humans

Solution

Question 6

J-shaped curve

zig-zag curve

parabola curve

S-shaped curve

Solution

Question 7

limiting resources

natality

mortality

population growth rate

Solution

Question 8

(i) and (ii)

(i) and (iii)

(ii) and (iii)

(iii) and (iv)

Solution

Question 9

Sea anemone

Tapeworm

Leech

Mosquito

Solution

Question 10

$$L_t\,=\,L_0\,+\,rt$$

$$W_1\,=\,W_0\,+\,e^{rt}$$

$$W_1\,=\,W_0e^{rt}$$

$$L_t\,=\,L_0\,-\,rt$$

Solution

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