Ecosystem · Biology · NEET
MCQ (Single Correct Answer)
Consider the pyramid of energy of an ecosystem given below:
If T$$_4$$ is equivalent to $$1000 \mathrm{~J}$$, what is the value at $$\mathrm{T}_1$$ ?
Which one of the following is not a limitation of ecological pyramids?
In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is $$100 x\left(\mathrm{kcal} \mathrm{~m}^{-2}\right) \mathrm{yr}^{-1}$$, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
Match List - I with List - II
| List - I | List - II | ||
|---|---|---|---|
| (A) | Hydrarch succession | (I) | Gradual change in the species composition |
| (B) | Xerarch succession | (II) | Faster and climax reached quickly |
| (C) | Ecological succession | (III) | Lichens to mesic conditions |
| (D) | Secondary succession | (IV) | Phytoplankton to mesic conditions |
Choose the correct answer from the options given below :
The amount of nutrients such as carbon, nitrogen, potassium and calcium present in the soil at any given time is referred to as :
The species of plants that plays a vital role in controlling the relative abundance of other species in a community is called _________.
Identify the correct statements :
A. Detrivores perform fragmentation.
B. The humus is further degraded by some microbes during mineralization.
C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.
D. The detritus food chain begins with living organisms.
E. Earthworms break down detritus into smaller particles by a process called catabolism.
Choose the correct answer from the options given below :
In the equation GPP $$-$$ R = NPP
GPP is Gross Primary Productivity
NPP is Net Primary Productivity
R here is __________.
Which one of the following statements is NOT correct?
Match List I with List II:
| List I (Interaction) |
List II (Species A and B) |
||
|---|---|---|---|
| (A) | Mutualism | (I) | +(A), 0(B) |
| (B) | Commensalism | (II) | $$-$$(A), 0(B) |
| (C) | Amensalism | (III) | +(A), $$-$$(B) |
| (D) | Parasitism | (IV) | +(A), +(B) |
Choose the correct answer from the options given below:
All successions irrespective of the habitat proceed to which type of climax community?
The pioneer species in a hydrarch succession are
The species that come to appear in bare area are called
The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called
Two butterfly species are competing for the same nectar of a flower in a garden. To survive and coexist together, they may avoid competition in the same garden by :
Given below are two statements:
Statement I : Decomposition is a process in which the detritus is degraded into simpler substances by microbes.
Statement II : Decomposition is faster if the detritus is rich in lignin and chitin.
In the light of the above statements, choose the correct answer from the options given below :
Which one of the following will accelerate phosphorus cycle?
Detritivores breakdown detritus into smaller particles. This process is called :
R represents :
(A) Fourth trophic level (i) Crow
(B) Second trophic level (ii) Vulture
(C) First trophic level (iii) Rabbit
(D) Third trophic level (iv) Grass
Select the correct option
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g
Plant → mice → snake → peacock
| (a) Earthworm | (i) Pioneer species |
|---|---|
| (b) Succession | (ii) Detritivore |
| (c) Ecosystem service | (iii) Natality |
| (d) Population growth | (iv) Pollination |
Plant → insect → frog →"A"→ Eagle
(i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(ii) Removal of most of the carnivores resulted in an increased population of deers
(iii) The length of food chains is generally limited to 3-4 trophic levels due to energy loss
(iv) The length of food chains may vary from 2 to 8 trophic levels
Which of two of the above statements are correct ?