Ecosystem Test

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Ecosystem Test - 66

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Weekly Quiz Competition

Question 1
1 / -0

Which one is not causes of secondary succession

A
Overgrazing

B
Shifting

C
Agricultural practices

D
Sand dunes

Solution

Secondary succession is the series of community changes which take place on a previously colonized, but disturbed or damaged habitat. It is caused by overgrazing, agricultural practices and sand dunes.
So the correct answer is 'Shifting'.
Question 2
1 / -0

What happens in biological magnification?

A
A progressive increase in the level of energy transferred through trophic levels

B
A progressive increase in the body weight through trophic levels

C
A progressive increase in the number of organisms through trophic levels

D
A progressive increase in the amount of harmful substances through trophic levels

Solution

Biomagnification (or bioaccumulation) refers to the ability of living organisms to accumulate certain chemicals to a concentration larger than that occurring in their inorganic, non-living environment, or in the case of animals, in the food that they eat. The contaminants include heavy metals namely mercury, arsenic, pesticides such as DDT, and polychlorinated biphenyls (PCBs) compounds which are then taken up by organisms because of the food they consume or the intoxication of their environment. These materials are highly present in a variety of household and industrial chemicals. The harmful substances then build up inside the organism’s cells. When organisms in the higher food chain consume the organisms containing the toxins below their trophic levels, the toxins gradually become concentrated in the higher food chain. Because this is a repetitive process in the ecosystem and throughout the entire food chain, the higher organisms are the ones that will accumulate most of the toxins.
So the correct option is 'a progressive increase in the level of energy transferred through trophic levels'.
Question 3
1 / -0

Sedge meadow stage and reed swamp stage are several stages seen in.

A
psammosere

B
lithosere

C
hydro-sere

D
aerosere
Solution
A hydrosere is an area of succession that is seen in an area of freshwater and it consists of seven stages:
Phytoplankton stage: In this stage simple forms of life like bacteria, algae and other aquatic plants (phytoplankton) and animals (zooplankton) floating in water are the pioneer colonizers.
Submerged stage: a loose layer of mud is formed on the bottom of the pond and some rooted submerged hydrophytes begin to appear.
Floating stage: submerged vegetation starts disappearing from its original place and then the floating plants make their appearance gradually in that area.
Reed swamp stage: floating plants start disappearing gradually and their places are occupied by amphibious plants which can live successfully in aquatic as well as the aerial environment.
Sedge Marsh or meadow stage: marshy soil is seen and plants adapted to this environment is seen.
Woodland stage: some shrubs and later medium-sized trees form open vegetation or woodland.
Climax forest: The hydrosere leads to the development of climax vegetation.
So, the correct option is 'hydrosere'.
Question 4
1 / -0

_____ is the basic unit of ecological hierarchy.

A
Gene

B
Species

C
Individual

D
Animals

Solution

Ecological hierarchy theory describes the arrangement of biological organisms in relation to one another. At the simplest level of the hierarchy are individual organisms. At the individual level, interactions with other organisms are not considered. Moving up the hierarchy, ecologists have found more complex ways to describe the relationships between organisms. These culminate in the biosphere, which describes the totality of all living things on planet Earth. The first level of the ecological hierarchy is the individual organism. This level of the hierarchy examines how one organism interacts with its environment.
Hence, the correct answer is 'Individual'
Question 5
1 / -0

Secondary/Succession takes on/in:

A
Bare rock

B
Degraded forest

C
Newly created pond

D
Newly cooled lava

Solution

Secondary succession is one of the types of ecological succession of a plant life. As opposed to the first primary succession, secondary succession is process started by an event that reduces the established ecosystem
So, the correct answer is 'Degraded forest'
Question 6
1 / -0

Flg can maintain community structure during food scarcity in tropical deciduous forest these are act as:

A
Exotic species

B
Pioneer species

C
Edge species

D
Key stone species
Solution
Species are the group of interbreeding individuals, there are various types of species.
- Exotic species - They are those species which are moved by humans from one place to another or are accidentally carried away. They are also termed as alien or invasive species.
- Pioneer species - They are the first ones to be present in the succession and are hard algae or moss. They provide stability to the ecosystem.
- Edge species - They are the species of their own kind, if they got extinct then they cannot be replaced by any other species. EDGE refers to Evolutionarily Distinct and Globally Endangered species.
- Keystone species - They are species that have the main role in the maintenance of an ecosystem, they support the community structure and ecosystem even at the time of food scarcity. If they are not present then it will lead to the destruction of an ecosystem.
So, the correct option is 'Keystone species'.
Question 7
1 / -0

Which one is the Sedimentary Cycle?

A
Oxygen Cycle

B
Nitrogen Cycle

C
Hydrogen Cycle

D
Phosphorus Cycle

Solution

Sedimentary cycles are those cycles that involve earthbound elements like, calcium, sulfur, phosphorous etc. The phosphorus cycle does not involve the atmosphere, it mainly cycles through water, soil and sediments.

So, the correct option is 'Phosphorous cycle'.
Question 8
1 / -0

Functional aspect of ecosystem is?

A
Topography

B
Homeostasis

C
Inorganic nutrients

D
Species compositions
Question 9
1 / -0

In a pyramid of biomass, it the total dry weight $$(kgm^{-2})$$ primary producers is about $$809$$. It will decrease at tertiary consumer level upto.

A
$$37kgm^{-2}$$

B
$$11kgm^{-2}$$

C
$$5kgm^{-2}$$

D
$$1.5kgm^{-2}$$

Solution

So the correct option is D.
Question 10
1 / -0

A climax community is recognized by _______________.

A
Grass,herbs and shrubs

B
Trees

C
High biomass

D
Uniform composition

Solution

A climax community is recognized by $$\rightarrow$$ (B) Trees.
Climax community are ecological community in which populations of plants or animals remain stable and exist in balance with each other and their environment.

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Re-Attempt Weekly Quiz Competition

Ecosystem Test - 66

Result

Ecosystem Test - 66

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SHARING IS CARING

Question 1

Overgrazing

Shifting

Agricultural practices

Sand dunes

Solution

Question 2

A progressive increase in the level of energy transferred through trophic levels

A progressive increase in the body weight through trophic levels

A progressive increase in the number of organisms through trophic levels

A progressive increase in the amount of harmful substances through trophic levels

Solution

Question 3

psammosere

lithosere

hydro-sere

aerosere

Solution

Question 4

Gene

Species

Individual

Animals

Solution

Question 5

Bare rock

Degraded forest

Newly created pond

Newly cooled lava

Solution

Question 6

Exotic species

Pioneer species

Edge species

Key stone species

Solution

Question 7

Oxygen Cycle

Nitrogen Cycle

Hydrogen Cycle

Phosphorus Cycle

Solution

Question 8

Topography

Homeostasis

Inorganic nutrients

Species compositions

Question 9

$$37kgm^{-2}$$

$$11kgm^{-2}$$

$$5kgm^{-2}$$

$$1.5kgm^{-2}$$

Solution

Question 10

Grass,herbs and shrubs

Trees

High biomass

Uniform composition

Solution

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