Ecosystem Test

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Ecosystem Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

Water requirement of Kangaroo/Desert rat is largely met by

A
Hydration of food

B
Metabolic water

C
Hygroscopic skin

D
Moist soil
Question 2
1 / -0

Plant succession occurring in a sandy area is

A
Psammosere

B
Halosere

C
Xerosere

D
Hydrosere

Solution

Ecological succession seen in coastal areas with sandy rocks is called psammosere succession. They are the seral communities, seen primarily in an area.
So, option A is the correct answer.
Question 3
1 / -0

Study of inter-relationships between a species/individual and its environment in all stages of its life cycle is

A
Synecology

B
Autecology

C
Forest Ecology

D
Ecology
Question 4
1 / -0

Climax community is

A
First stable community

B
Unstable

C
Unstable that develops in the beginning of succession

D
The last stable community
Solution
Correct option: D
Explanation:
Ecological succession is the process in which a bare area is converted into a forest or a water area transformed into a forest.
The conversion is always from xeric to mesic form.
The first stable community is the pioneer species and that the final one is the climax community.
All those stages between them are called seral stages.
Hence, the climax community is "the last stable community."
Question 5
1 / -0

Succession in a 6 metre deep pond exhibits a sequence of :

A
Submerged Plants $$\rightarrow $$Reeds $$\rightarrow$$Herbs $$\rightarrow$$Floating Plants $$\rightarrow$$ Shrubs $$\rightarrow$$Trees

B
Floating Plants $$\rightarrow$$Submerged Plants $$\rightarrow$$ Reeds $$\rightarrow$$Herbs$$\rightarrow$$ Shrubs $$\rightarrow$$Trees

C
Shrubs$$\rightarrow$$Trees$$\rightarrow$$submerged Plants $$\rightarrow$$ Floating Plants $$\rightarrow$$ Reeds $$\rightarrow$$ Herbs

D
Submerged Plants $$ \rightarrow$$Floating Plants $$\rightarrow$$Reeds$$\rightarrow$$ Herbs$$\rightarrow$$Shrubs$$\rightarrow$$Trees.

Solution

Development of biotic organisms in a newly formed pond or lake is called hydrosere or hydrarch.
It starts as soon as the muddy water becomes clear. The stages includes
1. Phytoplankton stage
2. Submerged root stage
3. Floating root stage
4. Reeds stage
5. Herbs stage
6. Woodland stage
7. Forest stage
Question 6
1 / -0

Nature of climax community depends upon

A
Water

B
Temperature

C
Soil fertility

D
Climate

Solution

Climax community is the one which is last to invade in the process of ecological succession. It is the most stabilised communities of all. It is the final stage of succession and is unchanged. Its nature depends on its climate. It has various adaptations to suit to its climatic conditions.
So, option D is the correct answer.
Question 7
1 / -0

Deserts can be converted into green land by

A
Tropical trees

B
Oxylophytes

C
Halophytes

D
Psammophytes

Solution

Desert plants are called psammophytes. They have the capacity to survive in desert climates and sand filled environment over there. So, these plants have the capability to grow in deserts and convert them into grasslands.
So, option D is the correct answer.
Question 8
1 / -0

Which of the following is not a primary coloniser?

A
Viruses

B
Lichens

C
Blue-green algae

D
Mosses

Solution

Viruses are said to be a link between living and non living. This is because they cant reproduce on their own. They need a host tor reproduce. Once they enter a living host, they start the process of reproduction.
So, option A is the correct answer.
Question 9
1 / -0

A keystone species is the one which has

A
A small proportion of total biomass but has a huge impact on the community's organisation and survival.

B
A plenty of biomass but low impact on community's organisation.

C
A rare species with little impact on biomass and other species in the community.

D
A dominant species which has a large proportion of biomass and which affects many other species.

Solution

A keystone species is a non dominant species. It determines the structure of a given population, despite of present in limited amounts.
So, option A is the correct answer
Question 10
1 / -0

In autogenic succession,

A
The community itself modifies its own environment thus causing its own replacement by a new community.

B
Early dominance of heterotrophs.

C
Replacement of existing communities due to external conditions.

D
Early and continued dominance of autotrophic organisms.

E
There is previously built substratum with already existing matter.

Solution

Auto means self. Genic means to produce. In autogenic succession, the biotic that are present in the ecosystem of that community. The members of that community cause various changes so that ecological succession starts.
So, option A is the correct answer.

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Re-Attempt Weekly Quiz Competition

Ecosystem Test - 45

Result

Ecosystem Test - 45

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SHARING IS CARING

Question 1

Hydration of food

Metabolic water

Hygroscopic skin

Moist soil

Question 2

Psammosere

Halosere

Xerosere

Hydrosere

Solution

Question 3

Synecology

Autecology

Forest Ecology

Ecology

Question 4

First stable community

Unstable

Unstable that develops in the beginning of succession

The last stable community

Solution

Question 5

Submerged Plants $$\rightarrow $$Reeds $$\rightarrow$$Herbs $$\rightarrow$$Floating Plants $$\rightarrow$$ Shrubs $$\rightarrow$$Trees

Floating Plants $$\rightarrow$$Submerged Plants $$\rightarrow$$ Reeds $$\rightarrow$$Herbs$$\rightarrow$$ Shrubs $$\rightarrow$$Trees

Shrubs$$\rightarrow$$Trees$$\rightarrow$$submerged Plants $$\rightarrow$$ Floating Plants $$\rightarrow$$ Reeds $$\rightarrow$$ Herbs

Submerged Plants $$ \rightarrow$$Floating Plants $$\rightarrow$$Reeds$$\rightarrow$$ Herbs$$\rightarrow$$Shrubs$$\rightarrow$$Trees.

Solution

Question 6

Water

Temperature

Soil fertility

Climate

Solution

Question 7

Tropical trees

Oxylophytes

Halophytes

Psammophytes

Solution

Question 8

Viruses

Lichens

Blue-green algae

Mosses

Solution

Question 9

A small proportion of total biomass but has a huge impact on the community's organisation and survival.

A plenty of biomass but low impact on community's organisation.

A rare species with little impact on biomass and other species in the community.

A dominant species which has a large proportion of biomass and which affects many other species.

Solution

Question 10

The community itself modifies its own environment thus causing its own replacement by a new community.

Early dominance of heterotrophs.

Replacement of existing communities due to external conditions.

Early and continued dominance of autotrophic organisms.

There is previously built substratum with already existing matter.

Solution

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