Ecosystem Test

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Ecosystem Test - 25

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Weekly Quiz Competition

Question 1
1 / -0

In lake ecosystem, pyramid biomass is

A
Upright

B
Inverted

C
Anything is possible

D
None of the above
Question 2
1 / -0

If all decomposers are removed from an ecosystem, what will happen?

A
All consumer will die

B
Energy cycle will be inverted

C
Balance of biogeochemical cycle will be disturbed

D
Only herbivores will die
Solution
- Decomposers are saprotrophs, which decompose the organic remains by secreting extracellular digestive enzymes.
- Due to degradation of organic remains, decomposers are also called as reducers. They are also known as mineralisers as they release minerals trapped in organic remains.
- Detrivores are decomposers as well as scavengers, e.g., earthworm.
- Decomposition of organic wastes and dead and decaying plants and animals returns the minerals locked in living systems back to the environment.
- Thus, decomposition is very important for the biogeochemical cycles, or nutrient cycling.
Question 3
1 / -0

In a grassland ecosystem, the largest population in a pyramid of number is _______.

A
Producers

B
Tertiary consumers

C
Secondary consumers

D
Primary consumers

E
Herbivores

Solution

In a grassland ecosystem, the pyramid of number is upright as a maximum number of organisms occur at the producer level, followed by a smaller number of herbivores, fewer primary carnivores, and still fewer higher levels of carnivores.
Thus, the correct answer is option A.
Question 4
1 / -0

Ecosystem may be defined as _______.

A
Group of plants which act as the energy suppliers

B
Group of organisms which form population

C
Functional unit of environment

D
All of the above

Solution

The ecosystem is a segment of nature or biosphere consisting of a community of living beings and the abiotic or physical environment both interacting and exchanging materials between them. The ecosystem is defined as a functional unit of environment, which is independent and self-sustaining due to various interactions between abiotic and biotic components and different organisms among themselves.
So, the correct answer is C.
Question 5
1 / -0

In a tree ecosystem, the pyramid of number is

A
Upright

B
Inverted

C
Both A and B

D
None of the above

Solution

The pyramid of number is a graphical representation of the number of individuals at each trophic levels. It is generally upright as a maximum number of organisms occurs at the producer level, followed by less number of organisms at successively higher trophic levels. However, a single large-sized tree can provide food to several herbivores e.g., birds, squirrels etc. which support a few carnivores. Such a pyramid of number is always inverted. Therefore, the correct answer is option B.
Question 6
1 / -0

The pyramid of energy in a forest ecosystem is

A
Always upright

B
Always inverted

C
Both upright and inverted

D
None of the above

Solution

Ecological pyramid is the graphic representation of an ecological parameter (number, biomass or energy).
The ecological pyramid can be upright, inverted or spindle shaped. The pyramid of energy gives graphic representation of flow of energy in different trophic levels. It is always upright because only 10 percent of energy is transferred from one trophic level to the next.
Thus, the correct answer is option A.
Question 7
1 / -0

The pyramid of number is based on

A
Unit per area

B
Food per individual

C
Individuals in trophic level

D
Energy per unit area
Solution
- Pyramid of number is an ecological/Eltonian pyramid.
- It is a graphical representation of a number of individuals at each trophic levels.
- It puts organisms sequence-wise, with producers at the base and various consumers at successively higher levels.
Thus, the correct answer is option C.
Question 8
1 / -0

Energy storage at consumer level is called as

A
Gross primary productivity

B
Secondary productivity

C
Net primary productivity

D
Net productivity

Solution

Primary productivity is the amount of energy or biomass accumulation in green plants per unit area per unit time. It depends upon the availability of solar radiations, optimum temperature, soil moisture and biogenetic nutrients.
Gross primary productivity is the total organic matter synthesized by the producers in the process of photosynthesis.
Net primary productivity is the total organic matter stored by producers per unit area per unit time.
Secondary productivity is synthesis of organic matter by consumers per unit area per unit time.
Question 9
1 / -0

Ecosystem is

A
Open

B
Closed

C
Both A and B

D
Neither open nor closed
Solution
- An ecosystem is an open system because an open system is a system in which energy and nutrients are exchanged between the physical environment and living organisms.
- All the ecosystems on Earth are called open systems.
Therefore, the correct answer is option A.
Question 10
1 / -0

Which of the following ecosystem has the highest gross primary productivity?

A
Grassland

B
Coral reef

C
Mangroves

D
Rain forest

Solution

Primary productivity is the amount of energy (measured in kcal per square meter per year) or biomass (measured in grams per square meter per year), accumulated in green plants per unit area per unit time. It depends on the availability of solar radiations, optimum temperature, soil moisture and biogenetic nutrients.
Coral reef ecosystem has highest gross primary productivity due to availability of large number of autotrophs per unit area.

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Ecosystem Test - 25

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Ecosystem Test - 25

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Question 1

Upright

Inverted

Anything is possible

None of the above

Question 2

All consumer will die

Energy cycle will be inverted

Balance of biogeochemical cycle will be disturbed

Only herbivores will die

Solution

Question 3

Producers

Tertiary consumers

Secondary consumers

Primary consumers

Herbivores

Solution

Question 4

Group of plants which act as the energy suppliers

Group of organisms which form population

Functional unit of environment

All of the above

Solution

Question 5

Upright

Inverted

Both A and B

None of the above

Solution

Question 6

Always upright

Always inverted

Both upright and inverted

None of the above

Solution

Question 7

Unit per area

Food per individual

Individuals in trophic level

Energy per unit area

Solution

Question 8

Gross primary productivity

Secondary productivity

Net primary productivity

Net productivity

Solution

Question 9

Open

Closed

Both A and B

Neither open nor closed

Solution

Question 10

Grassland

Coral reef

Mangroves

Rain forest

Solution

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