Ecosystem MCQs* (45-90 of 90 Q)

 

Question:   From NCERT NEET  Derived PYQ 

Which of the following is not a limitation of ecological pyramids?

1. It does not take into account the same species belonging to two or more trophic levels.

2. It assumes a simple food chain, something that almost never exists in nature;

3. It does not accommodate a food web.

4. Saprophytes are not given a special place in ecological pyramids.

 Answer ▽ 

4. Saprophytes are not given a special place in ecological pyramids

There are certain limitations in the ecological pyramids:
1. Pyramids does not take into account the same species belonging to two or more trophic levels. E.g.: Sparrow and insectivorous plants.
2. It assumes a simple food chain something that almost never exist in nature.
3. It does not accommodate a food web.
4. Moreover decomposer or saprophytes are not given any place in ecological pyramids even through they play a vital role in the ecosystem.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Which of the following group of organisms is not included in the ecological pyramids?

1. Herbivores

2. Carnivores

3. Saprophytes

4. Predators

 Answer ▽ 

3. Saprophyte

There are certain limitations in the ecological pyramids:
1. Pyramids does not take into account the same species belonging to two or more trophic levels. E.g.: Sparrow and insectivorous plants.
2. It assumes a simple food chain something that almost never exist in nature.
3. It does not accommodate a food web.
4. Moreover decomposer or saprophytes are not given any place in ecological pyramids even through they play a vital role in the ecosystem.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

What do you mean by ecological succession?

1. One community is succeeded by another

2. One community is dominant over another

3. The gradual and fairly predictable change in the species composition of a given area

4. Success of the ecological community.

 Answer ▽ 

3. The gradual and fairly predictable change in the species composition of a given area

The gradual and fairly predictable changes in species composition of a given area is called ecological succession. The sere refers to the different stages that form and eliminate in the process of the ecological succession until the climax community colonozes the area.

Hence, the correct answer is 'Ecological Succession'

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

The gradual and fairly predictable change in species composition of a given area is

A

Ecological succession

B

Climax community

C

Pioneer species

D

Stratification

Medium

 Answer ▽ 

A

The gradual and fairly predictable changes in species composition of a given area is called ecological succession. The sere refers to the different stages that form and eliminate in the process of the ecological succession until the climax community colonozes the area.

Hence, the correct answer is 'Ecological Succession'

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Ecological succession occurs-

1. In a species

2. In population

3. In a community

4. All of the above

 Answer ▽ 

3. In a community

Ecological succession is the gradual and fairly predictable change in the species composition of a given area. During succession, some species colonies area and their population become more numerous, whereas, the population of other species declines and even disappears.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

The final stable community in ecological succession is ?

A

Seral community

B

Pioneer communiy

C

Ecosere

D

Climax community

 Answer ▽ 

Correct option is D)

The climax community is stable, self-perpetuating and final community appearing in an area at the end of biotic succession, which is in perfect harmony with the climate of the area. 

The vegetation in that particular area has been reached to a stable condition after ecological succession.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Nature of change in community during succession is –

1. Orderly, sequential and parallel with the changes in the physical environment.

2. Independent of the changes in the physical environment.

3. Constant change

4. Depends upon the community

 Answer ▽ 

1. Orderly, sequential and parallel with the changes in the physical environment.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

What do you mean by sere?

1. Series of communities in an area

2. The entire sequence of communities that successively change in a given area

3. The entire sequence of communities.

4. The entire sequence of communities that do not change in a given area.

 Answer ▽ 

2. The entire sequence of communities that successively change in a given area

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

The individual transitional communities in a sere are termed as-

1. Seral stages

2. Seral communities

3. Seral species

4. Both 1 and 2.

 Answer ▽ 

4. Both 1 and 2.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Where does succession starts?

1. In an area inhabiting small plants

2. In an area with no living organisms.

3. In an area with fertile soil only

4. In an area with blue green algae

 Answer ▽ 

2. In an area with no living organisms.

Ecological succession happens when new life takes over an environment. ... Primary succession occurs in essentially lifeless areas—regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier.

Primary Succession. Primary succession is the succession that begins in lifeless areas such as the regions devoid of soil or barren lands where the soil is unable to sustain life.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

If succession starts on bare rocks, it is known as-

1. Early succession

2. Primary succession

3. Secondary succession

4. None of the above

 Answer ▽ 

2. Primary succession

Primary Succession. Primary succession is the succession that begins in lifeless areas such as the regions devoid of soil or barren lands where the soil is unable to sustain life.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

At any time during succession, natural or human induced disturbances (fire, deforestation, etc.), could-

1. Convert a particular seral stage of succession to an earlier stage.

2. Create new conditions that encourage some species and discourage or eliminate other species.

3. Have no effect on the continuous process of succession.

4. More than one options are correct.

 Answer ▽ 

4. More than one options are correct.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Which term represents the medium water condition?

1. Xeric

2. Hydric

3. Mesic

4. Metic

 Answer ▽ 

3. Mesic

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

How do Lichens play a vital role in succession?

1. They grow in pollution free area

2. They secrete acids to dissolve rock, helping in weathering and soil formation.

3. They are symbiotic association between fungi and algae.

4. More than one options are correct.

 Answer ▽ 

2. They secrete acids to dissolve rock, helping in weathering and soil formation.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

What would be the order of plants in a xerarch succession?

1. Lichens, bryophytes, small annual plants, perennial herbs, grasses

2. Lichens, bryophytes, grasses, perennial herbs

3. Grasses, Lichens, bryophytes, herbs

4. Small annual plants, perennial herbs, grasses Lichens, bryophytes

 Answer ▽ 

2. Lichens, bryophytes, grasses, perennial herbs

 This type of succession is limited by water availability as it occurs in dry conditions like sand deserts, rock deserts, etc. It begins with the formation of bare rocks by glaciers or volcano eruptions and reaches up to forest as a climax stage.

Xerarch succession is also called Xerosere as it occurs in xeric conditions like extremely dry environments and in this succession the development of species at different stages is limited by water availability. Xerosere begins when the bare rocks are produced and are colonized by lichens and mosses. These are followed by herbs and shrubs and finally, trees develop which in turn, form forest as the climax community in that environment.

 Ecological succession is of four types – Primary succession, Secondary succession, Cyclic succession, and Seral community.

The seral community is further divided into seven different types – Hydrosere, Xerosere, Lithosere, Psammosere, Halosere, Senile, and Eosere.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

In Hydrarch succession, the order of plant groups is-

1. Rooted-submerged plants, Phytoplanktons, rooted-floating angiosperms, reedswamp, scrub marsh-meadow,

2. Phytoplanktons, rooted-submerged plants, rooted-floating angiosperms, reedswamp, marsh-meadow, scrub

3. Phytoplanktons, rooted-submerged plants, rooted-floating angiosperms, scrub, reedswamp, marsh-meadow,

4. Phytoplanktons, rooted-floating angiosperms, rooted-submerged plants, reedswamp, marsh-meadow, scrub

 Answer ▽ 

2. Phytoplanktons, rooted-submerged plants, rooted-floating angiosperms, reedswamp, marsh-meadow, scrub

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

What would be the climax of a hydrarch succession?

1. Grassland

2. Land

3. Forest

4. Reedswamp

 Answer ▽ 

3. Forest

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Identify the stages of hydrarch succession.

                      A                                               B

1. Reed-swamp stage Mmarsh-meadow stage

2. Submerged plant stage Scrub stage

3. Reed-swamp stage Submerged plant stage

4. Scrub stage Marsh-meadow stage

 Answer ▽ 

1. Reed-swamp stage ; Mmarsh-meadow stage

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET 2021  

The amount of nutrients, such as carbon, nitrogen, phosphorus, calcium, etc. present in the soil at any given time, is referred to as the -

1. Nutrient status of soil

2. Standing state

3. Standing crop

4. Mineral state.

 Answer ▽ 

2. Standing state

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

What do we call to the the movement of nutrient elements through the various components of
an ecosystem ?

1. Recycling

2. nutrient cycling

3. Biogeochemical cycle

4. Both 2 and 3.

 Answer ▽ 

4. Both 2 and 3.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Where do we find reservoir for sedimentary type nutrient cycling?

1. Land

2. Sea

3. Earth’s crust

4. Atmosphere

 Answer ▽ 

3. Earth’s crust

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

What per cent of the dry weight of organisms constitutes carbon?

1. 17%

2. 28%

3. 49%

4. 67%

 Answer ▽ 

3. 49%

Composition of the human body

Element	Symbol	percent mass	percent atoms
Oxygen	O	65.0	24.0
Carbon	C	18.5	12.0
Hydrogen	H	10	62.0
Nitrogen	N	3.2	1.1
Calcium	Ca	1.5	0.22
Phosphorus	P	1.0	0.22
Potassium	K	0.4	0.03
Sulfur	S	0.3	0.038
Sodium	Na	0.2	0.037
Chlorine	Cl	0.2	0.024
Magnesium	Mg	0.1	0.015
All others		< 0.1	< 0.3

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Which is the second abundant matter in the body of an organism?

1. Phosphorous

2. Hydrogen

3. Carbon

4. Calcium

 Answer ▽ 

Carbon

Composition of the human body

Element	Symbol	percent mass	percent atoms
Oxygen	O	65.0	24.0
Carbon	C	18.5	12.0
Hydrogen	H	10	62.0
Nitrogen	N	3.2	1.1
Calcium	Ca	1.5	0.22
Phosphorus	P	1.0	0.22
Potassium	K	0.4	0.03
Sulfur	S	0.3	0.038
Sodium	Na	0.2	0.037
Chlorine	Cl	0.2	0.024
Magnesium	Mg	0.1	0.015
All others		< 0.1	< 0.3

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Question : Carbon constitutes _______of dry weight of organism and ________percentage is dissolved in oceans out of total global carbon.

A

49%,71%

B

71%,49%

C

49%,49%

D

71%,71%

71%,71%

 Answer ▽ 

A

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

How much of the total quantity of global carbon is dissolved in the oceans?

1. 50%

2. 62%

3. 71%

4. 84%

 Answer ▽ 

3

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Which of the following reservoir regulates the amount of carbon dioxide in the atmosphere?

1. Ocean

2. Earth’s crust

3. Land

4. Fossil

 Answer ▽ 

1. Ocean

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Approximately how much of carbon is fixed in the biosphere through photosynthesis annually.

1. 4 × ${10}^{13}$ kg

2. 5.4 x ${10}^{15}$ kg

3. 6.4 x ${10}^{11}$ kg

4. 13 x ${10}^4$ kg

 Answer ▽ 

1. 

 4 × ${10}^{13}$ kg

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Which of the following contribute to the atmospheric CO2?
a. Producers
b. Herbivores
c. Saprotrophs
d. All of the above

 Answer ▽ 

d. All of the above

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

How do herbivores and other animals obtain Phosphorous?

1. From soil in the dissolved form

2. From plants

3. From drinking water

4. Synthesized in the body.

 Answer ▽ 

2. From plants

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

The products of ecosystem processes are named as-

1. Environment services

2. Ecosystem services

3. Ecosystem products

4. Ecosystem taxes

 Answer ▽ 

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Out of the total cost of various ecosystem services, the soil formation accounts for about:-

A

50%

B

10%

C

6%

D

71%

 Answer ▽ 

Correct option is A)

Out of the aggregate expense of different ecosystem services, the dirt arrangement represents around 50 percent and commitments of different administrations like the diversion.

So, the correct option is '50%'.

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Who put the price tags on nature’s life-support services?

1. Robert may

2. John Ray

3. Robert Constanza

4. Reiter

 Answer ▽ 

3. Robert Constanza

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

How much price has been estimated by the researchers for the fundamental ecosystem services?

1. US $ 22 billion a year

2. US $ 33 trillion a year

3. US $ 40 trillion a year

4. US $ 52 million a year

 Answer ▽ 

2. US $ 33 trillion a year

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

What is the global gross nationalproduct GNPvalue?

1. US $ 16 trillion
b

2. US $ 18 trillion

3. US $ 24 trillion

4. US $ 26 trillion.

 Answer ▽ 

2. US $ 18 trillion

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Out of the total cost of various ecosystem services, the cost of climate regulation and habitat for wildlife are About-

1. 6 and 10%

2. 10 and 10%

3. 10 and 18 %

4. 6 and 6%

 Answer ▽ 

4. 6 and 6%

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET 2015  

In which of the following both pairs have correct combination? 

1. a

2. b

3. c

4. d

 Answer ▽ 

1

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET 2011  

Which one of the following statements is correct for secondary succession?

1.  It occurs on a deforested site

2.  It follows primary succession

3.  It is similar to primary succession except that it has a relatively slow pace

4.  All of the above

 Answer ▽ 

1.  It occurs on a deforested site

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET 2020  

Which of the following statements is incorrect?

1. Biomass decreases from first to fourth trophic level

2. Energy content gradually increases from first to fourth trophic level

3. Number of individuals decreases from first trophic level to fourth trophic level

4. Energy content gradually decreases from first to fourth trophic level

 Answer ▽ 

@ 2 incorrect

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET 2020  

Which of the following statements is incorrect regarding the phosphorus cycle?

1. Phosphates are the major form of phosphorus reservoir

2. Phosphorus solubilizing bacteria facilitate the release of phosphorus from organic remains

3. There is the appreciable respiratory release of phosphorus into the atmosphere

4. It is a sedimentary cycle

 Answer ▽ 

3

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

 The second stage of hydrosere is occupied by plants like________

(a) Salix

(b) Vallisneria

(c) Azolla

(d) Typha

 Answer ▽ 

B

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Presence of plants arranged into well defined vertical layers depending on their height can be seen be in______

(a) Tropical Savannah

(b) Grassland

(c) Tropical Rain Forest

(d) Temperate Forest

 Answer ▽ 

c) Tropical Rain Forest

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

The term ecosystem was coined by_______

(a) Warming

(b) Tansle

(c) Odum

(d) Haeckel

 Answer ▽ 

(b) Tansle

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Secondary productivity is the rate of formation of new organic matter by________

(a) Decomposers

(b) Parasite 

(c) Producers

(d) Consumer 

 Answer ▽ 

(d) Consumer 

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

 Which one occupies more than one trophic level in a pond ecosystem?

(a) Zooplankton

(b) Fish

(c) Phytoplankton

(d) Frog

 Answer ▽ 

(b) Fish

 ⬆️Prev____@organised notes_____Next⬇️

Question:   From NCERT NEET  Derived PYQ 

Pick up the correct statements regarding food chain.

(i) Removal of 80 tiger resulted in greatly 

increased growth of vegetation

(ii) Removal of most of the carnivores resulted in increased population of deer

(iii) Length of food chain is generaly limited to 3-4 trophic levels due to energy loss

(iv) Length of food chain may vary from 2-8 trophic levels

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (iii) and (iv)

(d) (i) and (iv)

 Answer ▽ 

Answer: B

 ⬆️Prev____@organised notes_____Next⬇️