Organisms and Populations Test

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Organisms and Populations Test - 53

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Weekly Quiz Competition

Question 1
1 / -0

Which one is parasite in true sense?

A
Head lice living on human scalp as well as laying eggs on human hair

B
Cuckoo laying eggs in Crow's nest

C
Female Anopheles biting and sucking blood from humans

D
Human foetus inside uterus and drawing nourishment from mother

Solution

Head lice are tiny parasites that live on the human head and feeds on blood from the scalp.
Question 2
1 / -0

Which one has maximum biomass?

A
Pond ecosystem

B
Lake ecosystem

C
Glassland ecosystem

D
Forest ecosystem

Solution

Ecosystem consists of living things like plants, animals and nonliving things like air, water. There are various ecosystems like pond ecosystem, forest ecosystem, grassland ecosystem, etc. The forest ecosystem has maximum biomass. Biomass is the mass of living organisms in an ecosystem in a given time. Forest ecosystem includes tropical rain forest, coral reef, sugarcane fields. These contributes to the high biomass in an ecosystem.
Thus, the correct answer is 'Forest ecosystem.'

Question 3

1 / -0

	I		II
a	Mutuatism	p	Ticks on dogs
b	Commenisalism	q	Balanus and Chihamalus
c	Parasitism	r	Sparrow and any seed
d	Competition	s	Orchid epiphyoe on Mango branch
e	Predation	t	Ophrys and bee

Match the columns and choose the correct options

a - t , b - s ,c - p ,d - q , e - r

a - q , b - p ,c - t ,d - s, e - r

a - r , b - q ,c - p ,d - t , c - s

a - s , b - r ,c - q ,d - p , e - t

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 4
1 / -0

What do a , b and c represent in the diagram?

A
Stationary, log and lag

B
Lag, stationary and log

C
Log, lag and stationary

D
Lag, log and stationary
Solution
The graph given represents the logistic growth curve that can be differentiated into the following three phases:-
a) Lag phase: The rate of growth is very slow in the lag phase. More time is needed for little growth in this phase.
b) Log phase (Exponential phase): The growth rate becomes maximum and more rapid.
c) Final steady-state (Stationary phase) or Adult phase: When the nutrients become limiting, growth slows down, so physiological activities of cells also slows down. This phase indicates the maturity of the growth system.

So, the correct answer is option D.
Question 5
1 / -0

Gause law is related to

A
Predation

B
Parasitism

C
Competitive exclusion

D
Coexistance

Solution

Gause's law is related to competition exclusion theorem. According to this law, if there are two species live in a particular habitat, and they have the same necessities for their survival, they cannot co-exist. They will face tough competition and either of them could survive.
So, option C is the correct answer.
Question 6
1 / -0

Which of the following interactions is /are examples of competition

I. Balanus and Cathamalus
II. Farm of rice paddies with weeds growing in the field
III. Monarch butterfly and birds
IV. Ophrys and wasp

A
I and III

B
I and II

C
I , II , and III

D
II , III and IV

E
IV only
Question 7
1 / -0

Which statement is false about predators ?

A
Predators keep prey population under control

B
Predators help in maintaining species diversity in a community

C
If a predator is not efficient, the prey population will become extinct

D
Tiger is an example of predator

Solution

If a predator does not function efficiently, then the prey and its population reproduces well and grow well. So, they won't become extinct.
Option C is false.
Question 8
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The two basic processes which contribute to a decrease in population density are

A
Natality and emigration

B
Mortality and immigration

C
Natality and immigration

D
Mortality and emigration

E
Emigration and immigration

Solution

The size of a population for any species is not a static parameter. It keeps changing in time, depending on various factors including food availability, predation pressure and reduces weather. In fact, it is these changes in population density that give us some idea of what is happening to the population - whether it is flourishing or declining. Whatever might be the ultimate reasons, the density of a population in a given habitat during a given period fluctuates due to changes in four basic processes, two of which (natality and immigration) contribute an increase in population density and two (mortality and emigration) to a decrease.
(i) 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 'D'.
Question 9
1 / -0

Which is correctly labelled

A
B-logistic curve

B
C-carrying capacity

C
C-exponential curve

D
A-carrying capacity

Solution

A represents the carrying capacity
B represents the population growth model equation
C represents the Verhulst pearl logistic growth curve
So the correct option is D.
Question 10
1 / -0

Identify the facultative parasite from below

A
Enterobius vermicularis

B
Mycobacterium tuberculosis

C
Taenia solium

D
Trichomonas hominis

Solution

Mycobacterium tuberculosis is a large and obligate aerobe and a facultative intracellular parasite made of macrophages.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 53

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Organisms and Populations Test - 53

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SHARING IS CARING

Question 1

Head lice living on human scalp as well as laying eggs on human hair

Cuckoo laying eggs in Crow's nest

Female Anopheles biting and sucking blood from humans

Human foetus inside uterus and drawing nourishment from mother

Solution

Question 2

Pond ecosystem

Lake ecosystem

Glassland ecosystem

Forest ecosystem

Solution

Question 3

a - t , b - s ,c - p ,d - q , e - r

a - q , b - p ,c - t ,d - s, e - r

a - r , b - q ,c - p ,d - t , c - s

a - s , b - r ,c - q ,d - p , e - t

Solution

Question 4

Stationary, log and lag

Lag, stationary and log

Log, lag and stationary

Lag, log and stationary

Solution

Question 5

Predation

Parasitism

Competitive exclusion

Coexistance

Solution

Question 6

I and III

I and II

I , II , and III

II , III and IV

IV only

Question 7

Predators keep prey population under control

Predators help in maintaining species diversity in a community

If a predator is not efficient, the prey population will become extinct

Tiger is an example of predator

Solution

Question 8

Natality and emigration

Mortality and immigration

Natality and immigration

Mortality and emigration

Emigration and immigration

Solution

Question 9

B-logistic curve

C-carrying capacity

C-exponential curve

A-carrying capacity

Solution

Question 10

Enterobius vermicularis

Mycobacterium tuberculosis

Taenia solium

Trichomonas hominis

Solution

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