Ecosystem Test

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Ecosystem Test - 63

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Weekly Quiz Competition

Question 1
1 / -0

Gross primary productivity is the rate of productivity of _______ during photosynthesis

A
organic matter

B
oxygen

C
carbon dioxide

D
chlorophyll

Solution

Gross primary productivity the rate of productivity of organic matter or biomass during photosynthesis.
So, the correct answer is option A, organic matter.
Question 2
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Secondary productivity is rate of formation of new organic matter by

A
Decomposers

B
Producers

C
Parasite

D
Consumer

Solution

Primary productivity is the rate of formation of organic matter or biomass by the producers. Secondary productivity corresponds to rate of formation of biomass or new organic matter by consumers.
So, the correct answer is option D, consumers.
Question 3
1 / -0

Highest net annual productivity occurs in

A
Tropical rain forests

B
Tropical deciduous forests

C
Temperate evergreen forests

D
Temprate deciduous forests

Solution

Tropical rainforests have a vast green cover that yields a high amount of biomass in during photosynthesis in a given time. Also, they have almost constant weather throughout the year that promotes high productivity. They have the highest net annual productivity.
So, the correct answer is option A, tropical rain forests.
Question 4
1 / -0

Highest plant productivity occurs in

A
Desert

B
Temperature grassland

C
Trophical rain forest

D
Tundra

Solution

Tropical rainforests have a vast green cover that yields a high amount of biomass in during photosynthesis in a given time. They have the highest plant productivity.
So, the correct answer is option C, tropical rain forest.
Question 5
1 / -0

The given pyramid represents

A
Pyramid of energy in lake ecosystem

B
Pyramid of number in lake ecosystem

C
Pyramid of biomass in grassland ecosystem

D
Pyramid of biomass in lake ecosystem

Solution

The graphical representation of tropic levels of the ecosystem is called Ecological pyramids.
Pyramid of energy always upright in land or water ecosystem. Pyramid of number is also upright always but the pyramid of biomass in the land ecosystem is upright and the pyramid of biomass in the lake is inverted. The phytoplankton, major producers has lower mass then heterotrophs such as fish and insect.
So the option is D correct because of a given diagram is inverted which is suitable for biomass of lake.
Question 6
1 / -0

In terms of the dry weight of organic matter, which of the following is related to the annual net primary productivity of the whole biosphere?

A
12 billion tonnes

B
Environmental factor

C
Herbivore species

D
Availability of nutrients

Solution

Net primary productivity refers to the biomass available for consumption. The annual net primary productivity of the whole biosphere is 170 billions tons of dry weight. The availability of the mineral nutrients in an environment determines productivity.
Hence, the correct answer is 'Availability of nutrients'
Question 7
1 / -0

Which of the following ecological food chain does not represent an erect pyramid of numbers?

A
Grass - Rodent - Snake

B
Insect - Chicken - Human

C
Tree - Bird - parasite

D
Grass - Deer - Tiger

Solution

Pyramid of numbers is the pyramid that represents the total number of individuals in a population at a different trophic level. Depending upon the number, the pyramid of numbers may not upright or inverted. In upright or erect pyramid of numbers, the number of individuals is decreased from lower level to higher trophic level. It is seen in grassland ecosystem. Ecological food chain of grass (producer) - grasshopper/deer (herbivores) - rodent/tiger (primary carnivores) - snake (secondary carnivores) is an example of erect pyramid of numbers. An insect (primary consumer) - chicken (secondary consumer) - human (tertiary consumer) is another example of erect pyramid of numbers. In inverted pyramid of numbers, the number of individuals is increases from lower level to higher trophic level. It is seen in tree ecosystem. Ecological food chain of tree (producer)- bird (herbivores) - parasites is an example of inverted pyramid of numbers.
Thus, the correct answer is 'Tree - Bird - parasite.'
Question 8
1 / -0

An ecosystem receives $$1,000,000 J$$ of sunlight energy, then what is the energy available at primary producer $$(T_1)$$ level?

A
$$10,000 J$$

B
$$1,00,000 J$$

C
$$1,000 J$$

D
$$100 J$$

Solution

According to the 10% law of energy transmission, the energy available at any trophic level is just 10% of what it has received. The rest is either lost as heat during transfer or used up in respiration. So, the 1,000,000 J of energy will be used by the plants for their metabolism and 10% will be available at their level. So, 10% of 1,000,000 is 1,00,000 J.
Hence, the correct answer is '1,00,000 J'
Question 9
1 / -0

Choose the correct sequence of transitional communities in Xerarch succession.

A
Mosses $$\rightarrow$$ Lichens $$\rightarrow$$ Grasses

B
Bryophytes $$\rightarrow$$ Forest $$\rightarrow$$ Shrubs

C
Bryophytes $$\rightarrow$$ Herbs $$\rightarrow$$ Shrubs

D
Lichens $$\rightarrow$$ Mosses$$\rightarrow$$ Herbs

Solution

Xerarch Succession: Plant succession starting on bare ground or rock and culminating in a mature climax forest. The pioneer species, such as lichens and mosses, result in the gradual accumulation of soil.
Some of the important stages of succession are as follows:
1. Crustose Lichen Stage 2. Foliose Lichens Stage 3. Moss Stage 4. Herbs Stage 5. Shrub Stage 6. Xerophytic Trees Stage 7. Forest Stage

So the answer is option D 'Lichens → Mosses→ Herbs'.
Question 10
1 / -0

Which of the following is an example of primary succession?
P. Freshwater lake
Q. Bare rock
R. Sand-dune
S. Abandoned field

A
$$P, R, S$$

B
$$P, Q, S$$

C
$$P, Q, R$$

D
$$Q, R, S$$
Solution
Primary succession is a type of ecological succession in which plants and animals first colonize a barren lifeless habitat.
Primary succession occurs where the absence of soil and living organisms like soil lava, abandoned fields, bare rock, sand dune.
So, the correct answer is 'Q, R, S'.

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Ecosystem Test - 63

Result

Ecosystem Test - 63

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SHARING IS CARING

Question 1

organic matter

oxygen

carbon dioxide

chlorophyll

Solution

Question 2

Decomposers

Producers

Parasite

Consumer

Solution

Question 3

Tropical rain forests

Tropical deciduous forests

Temperate evergreen forests

Temprate deciduous forests

Solution

Question 4

Desert

Temperature grassland

Trophical rain forest

Tundra

Solution

Question 5

Pyramid of energy in lake ecosystem

Pyramid of number in lake ecosystem

Pyramid of biomass in grassland ecosystem

Pyramid of biomass in lake ecosystem

Solution

Question 6

12 billion tonnes

Environmental factor

Herbivore species

Availability of nutrients

Solution

Question 7

Grass - Rodent - Snake

Insect - Chicken - Human

Tree - Bird - parasite

Grass - Deer - Tiger

Solution

Question 8

$$10,000 J$$

$$1,00,000 J$$

$$1,000 J$$

$$100 J$$

Solution

Question 9

Mosses $$\rightarrow$$ Lichens $$\rightarrow$$ Grasses

Bryophytes $$\rightarrow$$ Forest $$\rightarrow$$ Shrubs

Bryophytes $$\rightarrow$$ Herbs $$\rightarrow$$ Shrubs

Lichens $$\rightarrow$$ Mosses$$\rightarrow$$ Herbs

Solution

Question 10

$$P, R, S$$

$$P, Q, S$$

$$P, Q, R$$

$$Q, R, S$$

Solution

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