Ecosystem Test

Result

Ecosystem Test - 42

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The amount of light energy converted to chemical energy by photosynthesis per unit time is called

A
Trophic efficiency

B
Biomass

C
Secondary production

D
Gross primary productivity

E
Net primary productivity

Solution

A. Trophic efficiency or ecological efficiency is the percentage of energy transferred from one trophic level to the next.
B. Biomass is the amount of living matter present in an ecosystem and is synthesised by the producers that convert light energy into chemical energy by the process of photosynthesis.
C. Secondary production or secondary productivity is the rate of energy storage at consumer's level i.e. herbivores, carnivores and decomposers.
D. Gross primary productivity is the total rate of photosynthesis including the organic matter used up in respiration during the measurement period.
E. Net primary productivity is the rate of storage of organic matter in plant tissues in excess of the respiratory utilisation by plants during the measurement period.
So, the correct answer is 'Biomass'.
Question 2
1 / -0

African elephants push over or remove small acacia trees that sprout among the grasses in grasslands where they roam. The elephants' actions prevent the trees from getting too large and shading out the important grasses they consume Because the roots of the grasses run deep into the ground, they are able to continue to grow even when the shoots above the ground are eaten. This best describes the role of African elephants as

A
A keystone species

B
A producer

C
A decomposer

D
A scavenger

E
A secondary consumer

Solution

A. A keystone species paly a crucial role in the functioning of an ecosystem and its absence can affect the functioning of an ecosystem drastically.
B. A producer is a green plant that captures the light energy and convert it into solar energy.
C. A decomposer is a saprophyte and reduces the organic matter.
D. A scavenger is an animal that feeds on the dead plant and animal material.
E. A secondary consumer or carnivore is an animal that feeds on the primary consumers (herbivores) and producers (plants).
Since African elephants are playing important role in maintaining the growth of grasses and acacia trees, they are keystone species of that ecosystem.
So, the correct answer is 'Keystone species'.
Question 3
1 / -0

The pioneer species in Xerarch and Hydrarch succession are respectively

A
Lichens and sedges

B
Lichens and rooted hydrophytes

C
Lichens and phytoplanktons

D
Phytoplanktons and lichens
Solution
The pioneer species in xerarch and hydrarch succession are lichens and phytoplanktons respectively. Xerarch is a plant succession starting on bare ground or rock and culminating in a mature climax forest. The pioneer species, such as lichens and mosses, result in the gradual accumulation of soil.
Hydrarch is a plant succession which starts in relatively shallow water, such as ponds and lakes and culminating in a mature forest, e.g. phytoplankton, Hydrilla, Vallisneria.
So, the correct answer is option C.
Question 4
1 / -0

Net primary productivity is equal to

A
The amount of light energy converted to chemical energy by photosynthesis per unit time.

B
The amount of energy used by primary producers for respiration.

C
The amount of light energy converted to chemical energy by photosynthesis per unit time plus the amount of energy used by primary producers for respiration.

D
The amount of energy used by primary producers for respiration minus the amount of light energy converted to chemical energy by the primary producers.

E
The amount of light energy converted to chemical energy by photosynthesis per unit time minus the energy used by primary producers for respiration.

Solution

NPP or net primary productivity is the rate of storage of organic matter in plant tissues in excess of respiratory utilization by plants during the measurement period. It is the weight of organic matter stored by producers in a unit area/volume per unit time. NPP is equal to the rate of organic matter created by photosynthesis minus the rate of respiration and other losses.
So, the correct answer is 'The amount of light energy converted to chemical energy by photosynthesis per unit time minus the energy used by primary producers for respiration'.
Question 5
1 / -0

In phosphorus, cycle phosphorus enters an ecosystem, during which of the following processes?

A
Weathering

B
Respiration

C
Photosynthesis

D
Nitrification

E
Condensation

Solution

A. Weathering is the breakdown of rocks into smaller particles by the action of various environmental factors like wind, water, sunlight etc.
B. Respiration is the process by which living organisms derive energy by the oxidation of various complex organic substances.
C. Photosynthesis is the process by which green plants capture solar energy and convert it into light energy.
D. Nitrification is the conversion of ammonia into nitrates and is performed in two steps, nitrite formation and nitrate formation.
E. Condensation is the process by which gas changes into liquid drops.
Since rocks are made up of phosphorus and contain phosphates, their weathering will cause dissolution of phosphates in the soil and thus, phosphorus enters the ecosystem.
So, the correct answer is 'Weathering'.
Question 6
1 / -0

The removal of 'Keystone' species will effect

A
The producers

B
The consumers

C
The ecosystem

D
The decomposers

Solution

Keystone species are relatively fewer species but exert a profound effect on structure and functioning of the ecosystem as they regulate the availability of food, water and other resources. Removal of these species makes the other species in the community more abundant, rarer or may even cause their extinction. The correct answer is option C.
Question 7
1 / -0

Which of the following is expected to have the highest value $$\left(gm/{m}^{2}/yr\right)$$ in a grassland ecosystem?

A
Secondary Production (SP)

B
Tertiary Production (TP)

C
Gross Production (GP)

D
Net Production (NP)

Solution

Secondary production is the production of biomass of consumers such as herbivores and carnivores in an ecosystem. Tertiary production is the production of biomass of carnivores. Gross production is the total amount of biomass production in as ecosystem whereas net production is amount of energy or biomass left after respiration from the gross production (NP= GP - R). Thus, the correct answer is option C.
Question 8
1 / -0

Oxygen forms about ............. of the air in the atmosphere.

A
20%

B
30%

C
40%

D
45%
Question 9
1 / -0

In primary succession on rocks, the pioneer species are usually

A
Algae

B
Fungi

C
Lichens

D
Bryophytes

Solution

Lichens are considered as pioneer species in primary succession on rocks because they can easily grow on rocks where other plants cannot grow. They produce oxalic acid which induced the weathering of rocks and thus soil is formed. When these lichens die they increase the soil fertility so other plants can grow and start the chain reaction.
Question 10
1 / -0

Serule is

A
Hydrosere

B
Biosere

C
Microbial succession

D
Lithosphere

Solution

Serule is the microsuccession of bacteria and fungi on the decaying woods or barks. It occurs in the microhabitat and leads to the mesophytic forest.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Ecosystem Test - 42

Result

Ecosystem Test - 42

Score

-

Rank

-

SHARING IS CARING

Question 1

Trophic efficiency

Biomass

Secondary production

Gross primary productivity

Net primary productivity

Solution

Question 2

A keystone species

A producer

A decomposer

A scavenger

A secondary consumer

Solution

Question 3

Lichens and sedges

Lichens and rooted hydrophytes

Lichens and phytoplanktons

Phytoplanktons and lichens

Solution

Question 4

The amount of light energy converted to chemical energy by photosynthesis per unit time.

The amount of energy used by primary producers for respiration.

The amount of light energy converted to chemical energy by photosynthesis per unit time plus the amount of energy used by primary producers for respiration.

The amount of energy used by primary producers for respiration minus the amount of light energy converted to chemical energy by the primary producers.

The amount of light energy converted to chemical energy by photosynthesis per unit time minus the energy used by primary producers for respiration.

Solution

Question 5

Weathering

Respiration

Photosynthesis

Nitrification

Condensation

Solution

Question 6

The producers

The consumers

The ecosystem

The decomposers

Solution

Question 7

Secondary Production (SP)

Tertiary Production (TP)

Gross Production (GP)

Net Production (NP)

Solution

Question 8

20%

30%

40%

45%

Question 9

Algae

Fungi

Lichens

Bryophytes

Solution

Question 10

Hydrosere

Biosere

Microbial succession

Lithosphere

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.