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12th Biology Weekly Test - 4 ( Botany - Ecosystem )

St. Britto Hr. Sec. School - Madurai

12th Biology Weekly Test - 4 ( Botany - Ecosystem )-Aug 2020

Time : 1.00 Hours

Part - A

Multiple Choice Question - Answer All Question

Storage of energy by consumers per unit area per unit time after respiratory loss is ___________

Net Primary Productivity
Gross Secondary Productivity
Net Secondary Productivity
Gross Primary Productivity

Which of the following is / are not a natural ecosystem?

Forest ecosystem
Rice field
Grassland ecosystem
Desert ecosystem

If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain?

Plant \(\rightarrow\) Mice \(\rightarrow\) Snake \(\rightarrow\) Peacock

0.02 J
2.5 J
5 J
0.0002 J

Profundal zone is predominated by heterotrophs in a pond ecosystem, because of

with effective light penetration
no effective light penetration
complete absence of light
a and b

Significance of food web is I are

it does not maintain stability in nature
it shows patterns of energy transfer
it explains species interaction
b and c

Secondary succession takes place on/in

bare rock
degraded forest
newly created pond
barren lands

Which of the following is / are not the mechanism of decomposition

Eluviation
Catabolism
Anabolism
fragmentation

Which one of the following is called artificial ecosystem

Rice field
Maize field
Pond
Both a and b

Which one is in descending order of a food chain?

Producers Secondary consumers Primary consumers Tertiary consumers
Tertiary consumers Primary consumers Secondary consumers Producers
Tertiary consumers Secondary consumers Primary consumers Producers
Tertiary consumers Producers Primary consumers Secondary consumers

Which one of the following in not a functional unit of an ecosystem?

Productivity
Stratification
Energy flow
Decomposition

Carbon stored in fossil fuel is called ____________

blue carbon
black carbon
green carbon
grey carbon

Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

Frog
crow
Lion
Goat

Solar energy used by green plants photosynthesis is only

2 -8%
2- 10%
3 - 10%
2-9%

_______________ defined ecosystem as the structural and functional unit of ecology.

Tansley
Odum
Forbes
Karl Mobius

Arrange in order based oli process of succession.

(i) Climax
(ii) Competition
(iii) Reaction
(iv) Invasion
(v) Nudation
(vi) Ecesis

Nudation, Invasion, Ecesis, Aggregation, Competition, Reaction, Climax
Invasion, Aggregation, Competition, Ecesis, Nudation, Reaction, Climax
Climax, Competition, Reaction, Invasion, Nudation, Ecesis
Aggregation, Climax, Competition, Nudation, Invation, Reaction, Ecesis

Which of the following ecosystem has the highest primary productivity?

Pond ecosystem
Lake ecosystem
Grassland ecosystem
Forest ecosystem

Profunda! zone is predominated by heterotrophs in a pond ecosystem, because of

with effective light penetration
no effective light penetration
complete absence oflight
a and b

PAR is between the range of

400-600 nm
300 - 600 nm
400- 700 nm
200- 700 nm

Which of the following are not regulating services of ecosystem services?

(i) Genetic resources '
(ii) Recreation and aesthetic values
(iii) Invasion resistance
(iv) Climatic regulation

i and iii
ii and iv
i and ii
i and iv

Ten percent law was proposed by ____________

Elton
Thienemann
Lindeman
Odum

Significance of food web is / are

it does not maintain stability in nature
it shows patterns of energy transfer
it explains species interaction
b and c

Which of the following is not a sedimentary cycle

Nitrogen cycle
Phosphorous cycle
Sulphur cycle
Calcium cycle

Which one of the following organism occupies more than one trophiclevel in a pond ecosystem?

Fish
Zooplankton
Frog
Phytoplankton

Which of the following ecosystem has the highest primary productivity?

Pond ecosystem
Lake ecosystem
Grassland ecosystem
Forest ecosystem

Which of the following are not regulating services of ecosystem services
i) Genetic resources
ii) Recreation and aesthetic values
iii) Invasion resistance
iv) Climatic regulation

i and iii
ii and iv
i and ii
i and iv

Which one the following is not a sedimentary biogeochemical cycle in ecosystem?

Calcium
Carbon cycle
Sulphur cycle
Phosphorus cycle

Pond is a type of

forest ecosystem
grassland ecosystem
marine ecosystem
fresh water ecosystem

The following diagram represents

pyramid of number in a grassland
ecosystem
pyramid of number in a grassland ecosystem
pyramid of number in a pond ecosystem
pyramid of biomass in a pond ecosystem

Amount of living matter at a trophic level in an area at any time is called

Standing state
Standing crop
Detritus
Humus

The term 'ecosystem' was proposed by __________

S. A. Forbes
Vernadsky
A. G. Tansley
Odum

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