Ecosystems - Rajasthan Board (RBSE) STD 12 Science BIOLOGY Questions

Q 1M.C.Q (0.5 Marks)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 (0.5 Marks)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 (0.5 Marks)1 Mark

Each trophic level has a certain mass of living material at a particular time is known as:

A
Catabolism.
B
Standing crop.
C
Humification.
D
Primary productivity

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Q 4M.C.Q (0.5 Marks)1 Mark

Pyramid of number in a pond ecosystem is:

A
Irregular.
B
Inverted.
C
Upright.
D
Spindle-shaped.

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Q 5M.C.Q (0.5 Marks)1 Mark

In which condition, the gene ratio remains constant for any species?

A
Sexual selection.
B
Random mating.
C
Mutation.
D
Gene flow.

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Q 61 Marks Question1 Mark

Fill in the blanks.
In an ecosystem dominated by trees, the pyramid (of numbers) is _________ type.

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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 111.5 Marks Questions2 Marks

Distinguish between
Primary and secondary productivity.

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Q 121.5 Marks Questions2 Marks

Distinguish between
Food chain and Food web.

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Q 131.5 Marks Questions2 Marks

Distinguish between
Production and decomposition.

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Q 141.5 Marks Questions2 Marks

Distinguish between
Litter and detritus.

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Q 151.5 Marks Questions2 Marks

Distinguish between
Upright and inverted pyramid.

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Q 163 Marks Question3 Marks

Outline salient features of carbon cycling in an ecosystem.

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Q 173 Marks Question3 Marks

Write important features of a sedimentary cycle 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 214 Marks Questions4 Marks

Give an account of energy flow in an ecosystem.

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Q 224 Marks Questions4 Marks

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

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Q 234 Marks Questions4 Marks

Define decomposition and describe the processes and products of decomposition.

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Q 244 Marks Questions4 Marks

Describe the components of an ecosystem.

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Q 254 Marks Questions4 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 BIOLOGY - Ecosystems

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