Ecosystem Test

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Ecosystem Test - 57

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following aquatic ecosystems has very little primary productivity

A
River

B
Estuary

C
Lake

D
Marsh

Solution

Primary productivity within the river and streams, is restricted to benthic habitats involving algae and cyanobacteria. Rivers draining undisturbed are low in nutrients and consequently aquatic primary production is low.

So, the correct option is "rivers".
Question 2
1 / -0

Which of the following can explain the energy stored in an ecosystem?

A
Pyramid of biomass

B
Food chain

C
Pyramid of energy

D
Food web

Solution

An ecological pyramid is a graphical representation designed to show the biomass or bio productivity at each trophic level in a given ecosystem. A "pyramid of biomass" shows the relationship between biomass and trophic level by quantifying the biomass present at each trophic level of an energy community at a particular time. It is a graphical representation of biomass present in unit area in different trophic levels. The pyramid of biomass may be "inverted".
So the correct option is 'pyramid of biomass'.
Question 3
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When we study the full assortment of organisms in an area as well as the abiotic environment that affects them, we are studying the

A
populations

B
niche

C
ecosystem

D
community

Solution

an ecosystem includes both biotic and abiotic components of an area. Biotic components interact with their surroundings or the abiotic component to form a sustainable environment.
so the correct answer is 'ecosystem'.
Question 4
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Choose the correct answers from the alternatives given .
A living organism represents stored energy in the form of chemical compounds When an organism dies, what happens to.that stored energy?

A
All chemicals immediately lose their high-energy bonds

B
All molecules immediately degrade into basic elements

C
All energy immediately leaves, and that is. one manifestation that the organism is dead

D
Chemical compounds in cells lose their organisation over time because there is no longer an input of energy to maintain the organised state

Solution

There is constant input of energy needed for all the activities that go inside a living organism. Food is the source of this energy. When an organism dies, these activities or reactions are stopped which results in loss of organisation of chemical compounds in cells.
So, the correct option is 'Chemical compounds in cells lose their organisation over time because there is no longer an input of energy to maintain the organised state'.
Question 5
1 / -0

Clements proposed the climax-pattern model of succession. Governing factors for this succession that he proposed were

A
climate

B
soil conditions

C
each community modifies the environment

D
all of these

Solution

Every succession leads to the climax state. the governing factors for the succession are the type of soil, climatic conditions, the interaction of the community to the environment,
So, the correct option is 'all of these'
Question 6
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Primary succession takes much longer than secondary succession because it involves:

A
time for development of the soil horizons

B
more time for development of a seed.bank

C
colonization by organisms that are farther away

D
redevelopment of the atmospheric gases

Solution

Primary succession takes much longer than the secondary succession because in the primary succession the, the horizons are soil are made from scratch. primary succession can take millions if years.
So the correct option is 'time for development of the soil horizons'
Question 7
1 / -0

Choose the correct from the alternatives given.
Which one of the following organisms is the first to colonise a bare rock?

A
Lichens

B
Mosses

C
Perennial plants

D
Metazoans

Solution

Plant succession occurs on bare rocks is called Xerosere.
A.Lichens - These are the special type of plants formed by the association of algae and fungi. These are typically the first organisms to colonize bare rock. They are therefore the pioneer species in primary succession.
B.Mosses - These are one type of bryophytes formed after lichens
C.Perennial plants - These are angiosperms constitutes climax community in xerosere
So the correct option is 'lichens'.
Question 8
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Choose the correct answers from the alternatives given.
Some species of Anopheles mosquito live in brackish water, some in running fresh water, and others in stagnant water. What type of reproductive barrier is most obviously separating these different species?

A
Ecological isolation

B
Temporal isolation

C
Behavioural isolation

D
Postzygotic barriers

Solution

Populations may occupy the same territory but live in different habitats and so not meet are called Ecological isolation. Example the Anopheles maculipennis group consists of six species, some of which are involved in the transmission of malaria. Although the species are virtually indistinguishable morphologically, they are isolated reproductively, in part because they breed in different habitats. Some breed in brackish water, others in running fresh water, and still others in stagnant fresh water.
So, the correct answer is Ecological isolation.
Question 9
1 / -0

In a disturbed site in a community recovers and moves again toward the climax state.

A
area effect

B
primary succession

C
distance effect

D
secondary succession

Solution

Secondary succession is the type of succession where the there were living species present before and it was an ecosystem Due to some natural calamity such as fire, or earthquakes the ecosystem got destroyed. If the succession starts in such place it is known as secondary succession and there are many nutrients available in the a4ea beforehand.
This succession is faster.
So, the correct option is 'secondary succession'
Question 10
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Which one of the following Clements would consider to be the climax community in a humid environment?

A
The pioneer community

B
Lichens, mosses, and ferns

C
Large plants such as shrubs and trees

D
Small native plants of the area such as grasses and herbs

Solution

The climax community s the last stable community in the succession stage. The last climax stage involves large plants like trees, shrubs.
So, the correct option is 'Large plants such as shrubs and trees'

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Re-Attempt Weekly Quiz Competition

Ecosystem Test - 57

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Ecosystem Test - 57

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SHARING IS CARING

Question 1

River

Estuary

Lake

Marsh

Solution

Question 2

Pyramid of biomass

Food chain

Pyramid of energy

Food web

Solution

Question 3

populations

niche

ecosystem

community

Solution

Question 4

All chemicals immediately lose their high-energy bonds

All molecules immediately degrade into basic elements

All energy immediately leaves, and that is. one manifestation that the organism is dead

Chemical compounds in cells lose their organisation over time because there is no longer an input of energy to maintain the organised state

Solution

Question 5

climate

soil conditions

each community modifies the environment

all of these

Solution

Question 6

time for development of the soil horizons

more time for development of a seed.bank

colonization by organisms that are farther away

redevelopment of the atmospheric gases

Solution

Question 7

Lichens

Mosses

Perennial plants

Metazoans

Solution

Question 8

Ecological isolation

Temporal isolation

Behavioural isolation

Postzygotic barriers

Solution

Question 9

area effect

primary succession

distance effect

secondary succession

Solution

Question 10

The pioneer community

Lichens, mosses, and ferns

Large plants such as shrubs and trees

Small native plants of the area such as grasses and herbs

Solution

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