The rate of decomposition is faster in the ecosystem due to following factors except:

NEET-(Oct)2020 [Ecosystem] [class-xii ]

• Detritus rich in sugars
• Warm and moist environment
• Presence of aerobic soil microbes
• Detritus richer in lignin and chitin
Correct Option: D  [ Detritus richer in lignin and chitin ]

Remark:

Which of the following statements is incorrect?

NEET-(Oct)2020 [Ecosystem] [class-xii ]

• Biomass decreases from first to fourth trophic level
• Energy content gradually increases from first to fourth trophic level
• Number of individuals decreases from first trophic level to fourth trophic level
• Energy content gradually decreases from first to fourth trophic level
Correct Option: B  [ Energy content gradually increases from first to fourth trophic level ]

Remark:

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

NEET-(Oct)2020 [Ecosystem] [class-xii ]

• Phosphates are the major form of phosphorus reservoir
• Phosphorus solubilising bacteria facilitate the release of phosphorus from organic remains
• There is appreciable respiratory release of phosphorus into atmosphere
• It is sedimentary cycle
Correct Option: C  [ There is appreciable respiratory release of phosphorus into atmosphere ]

Remark:

Which of the following ecological pyramids is generally inverted?

NEET-2019 [Ecosystem] [class-xii ]

• Pyramid of biomass in a sea
• Pyramid of biomass in a forest
• Pyramid of energy
• Pyramid of numbers in grassland
Correct Option: A  [ Pyramid of biomass in a sea ]

Remark:

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x(kcalm^–2)yr^–1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?

NEET-2024 [Ecosystem] [class-xii ]

• 10x(kcalm^–2)yr^–1
• 100x/3x(kcalm^–2)yr^–1
• x/10(kcalm^–2)yr^–1
• x(kcalm^–2)yr^–1
Correct Option: A  [ 10x(kcalm^–2)yr^–1 ]

Remark: NCERT Page No.206, (Topic-12.2 PRODUCTIVITY)