Ecosystem Test

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Ecosystem Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following pairs is a sedimentary type of biogeochemical cycle __________.

A
Phosphorus and carbon dioxide

B
Oxygen and nitrogen

C
phosphorus and nitrogen

D
phosphorus and sulphur

Solution

In sedimentary cycles of matter, materials involved in circulation between biotic and abiotic components of biosphere are non gaseous and the reservoir pool is lithosphere e.g., phosphorus, calcium, magnesium.
Sulphur has both sedimentary and gaseous phases.
So, the correct answer is 'phosphorus and sulphur'
Question 2
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Natural reservoir of phosphorus is :

A
Sea water

B
Animal bones

C
Rock

D
Fossils

Solution

The natural reservoir of phosphate is the rock which contains phosphorus in the form of phosphates when rocks are weathered, minute amounts of these phosphate dissolve in soil solution and are absorbed by the roots of the plants. Herbivores and other animals obtain this element from plants.

So, the correct answer is 'Rock'.
Question 3
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Which one of the following element is the critical limiting factor in the function of ecosphere because of its irretrievable loss into the ocean ______________.

A
Phosphorus

B
Calcium

C
Magnesium

D
Iron

Solution

A large amount of phosphate is lost in the sea by sedimentation. This is irretrievable loss.
So, the correct answer is 'Phosphorus'
Question 4
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A long term global cycle which is linked by water and in
which sea floor rising play an important role is

A
Water cycle

B
Carbon cycle

C
Phosphorus cycle

D
Carbon and nitrogen cycle
Question 5
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The second stage of hydrosere is occupied by plants like

A
Typha

B
Salix

C
Vallisneria

D
Azolla

Solution

Correct option: C
Explanation:

The Hydrosere succession is the succession in which, a pond and its community are converted into land community. Different stages of hydrosere are:
(i) Phytoplankton stage: e.g., some blue-green algae, green algae (Volvox), diatoms and bacteria etc.
(ii) Rooted submerged stage, e.g., Hydrilla, Vallisneria, etc. - Second stage
(iii) Floating stage, e.g., Nymphaea, Some free-floating species like Azolla, Pistia etc.
(iv) Reed swamp stage, e.g., species of Typha.
(v) Sedge-meadow stage, e.g., species of Cyperaceae and Gramineae.
(vi) Woodland stage, e.g., Lantana, Salix, Populus.
(vii) Forest stage, e.g., Tropical rainforests, tropical deciduous forests.
Thus, second stage of hydrosere is occupied by Vallisneria. Option D is correct.
Question 6
1 / -0

Biogeochemical cycle with gaseous phase is

A
Carbon

B
Sodium

C
Phosphorus

D
Magnesium
Question 7
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Choose the ecological pyramids which is/are always upright?
I. Pyramid of numbers
II. Pyramid of biomass
III. Pyramid of energy

A
I only

B
II and III only

C
III only

D
I and II only
Question 8
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The following ecological pyramids represent the number of organisms involved in feeding relationships.

Choose the LETTER (A, B, C or D) which is most likely to represent the organisms in each of the figures.

A
Figure 1 : grass $$\rightarrow$$ locust $$\rightarrow$$ snake $$\rightarrow$$ frog, Figure 2 : grass $$\rightarrow$$ locust $$\rightarrow$$ frog

B
Figure 1 : tree $$\rightarrow$$ ant $$\rightarrow$$ spider $$\rightarrow$$ lizard, Figure 2 : tree $$\rightarrow$$ bird $$\rightarrow$$ parasites

C
Figure 1 : grass $$\rightarrow$$ locust $$\rightarrow$$ frog $$\rightarrow$$ snake, Figure 2 : tree $$\rightarrow$$ bird $$\rightarrow$$ parasites

D
Figure 1 : snake $$\rightarrow$$ frog $$\rightarrow$$ locust $$\rightarrow$$ grass, Figure 2 : tree $$\rightarrow$$ ant $$\rightarrow$$ spider
Question 9
1 / -0

The following ecological pyramids represent the number of organisms involved in feeding relationships.

Choose the LETTER (A, B, C or D) which is most likely to represent the organisms in each of the figures.

A

B

C

D
Question 10
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Biotic component of biosphere is not constituted of

A
Producers

B
Consumers

C
Decomposer

D
Air
Solution
- Producers are one of the type of biotic component, which produce their own food material from simple inorganic substances like $$CO_2$$ and water in presence of sunlight. E.g., Plants.
- Consumers are one of the type of biotic component, which consume food prepared by producers. E.g., Human being, animals.
- Decomposers are also one of the type of biotic component, which derive their food material from dead, decaying matter. Eg. Bacteria, fungi. Hence, option A, B and C are incorrect.
- Air is a abiotic or non-living type of component of biosphere.
Therefore, option D is correct.