Ecosystems - Bihar Board (BSEB) STD 12 Science BIOLOGY Questions

Q 1M.C.Q [1M]1 Mark

What percentage of photo synthetically active radiation is in relevant solar radiation ?

A
100%
B
1-5%
✓
50%
D
2-10%

Answer: C.

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Q 2M.C.Q [1M]1 Mark

It is known as the friend of farmers -

✓
Earthworm
B
Grasshopper
C
Rat
D
Peacock

Answer: A.

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Q 3M.C.Q [1M]1 Mark

Pyramid of numbers in a grassland/ true eco- system is:

A
Always inverted.
B
Always upright.
C
Both a) and b).
D
Spindle-shaped.

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Q 4M.C.Q [1M]1 Mark

Which of the following is/ are example(s) of man-made ecosystem?

A
Herbarium.
B
Crop fields.
C
Aquarium.
D
Both b) and c).

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Q 5M.C.Q [1M]1 Mark

An inverted pyramid of biomass can be found in which ecosystem?

A
Marine.
B
Forest.
C
Grass land.
D
Tundra.

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Q 61 Marks Question1 Mark

Fill in the blanks.
Plants are called as _________ because they fix carbon dioxide.

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Q 71 Marks Question1 Mark

Which one of the following has the largest population in a food chain?

Producers.
Primary consumers.
Secondary consumers.
Decomposers.

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Q 81 Marks Question1 Mark

Secondary producers are:

Herbivores.
Producers.
Carnivores.
None of the above.

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Q 91 Marks Question1 Mark

The second trophic level in a lake is-

Phytoplankton.
Zooplankton.
Benthos.
Fishes.

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Q 101 Marks Question1 Mark

What is the percentage of photosynthetically active radiation (PAR), in the incident solar radiation.

100%
50%
1-5%
2-10%

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Q 11Short Answer Type Questions [2M]2 Marks

What is primary productivity? Give brief description of factors that affect primary productivity.

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Q 12Short Answer Type Questions [2M]2 Marks

Distinguish between
Litter and detritus.

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Q 13Short Answer Type Questions [2M]2 Marks

Distinguish between
Production and decomposition.

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Q 14Short Answer Type Questions [2M]2 Marks

Distinguish between
Grazing food chain and detritus food chain.

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Q 15Short Answer Type Questions [2M]2 Marks

Distinguish between
Primary and secondary productivity.

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Q 163 Marks Question3 Marks

Write important features of a sedimentary cycle in an ecosystem.

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Q 173 Marks Question3 Marks

Outline salient features of carbon cycling in an ecosystem.

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Q 183 Marks Question3 Marks

Differentiate between primary and secondary succession. Provide one example of each.

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Q 193 Marks Question3 Marks

Describe the inter-relationship between productivity, gross primary productivity and net productivity.

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Q 203 Marks Question3 Marks

State the function of a reservoir in a nutrient cycle. Explain the simplified model of carbon cycle in nature.

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Q 21Long Answer Type Questions [5M]5 Marks

Give an account of energy flow in an ecosystem.

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Q 22Long Answer Type Questions [5M]5 Marks

Describe the components of an ecosystem.

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Q 23Long Answer Type Questions [5M]5 Marks

Define ecological pyramids and describe with examples, pyramids of number and biomass.

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Q 24Long Answer Type Questions [5M]5 Marks

Define decomposition and describe the processes and products of decomposition.

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Q 25Long Answer Type Questions [5M]5 Marks

What is an ecological pyramid? Compare the pyramids of energy, biomass and numbers.
Write any two limitations of ecological pyramids.

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Ecosystems question types

Ecosystems questions

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Ecosystems BIOLOGY - Ecosystems

Ecosystems question types

Ecosystems questions

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