Productivity and Decomposition in Ecosystem
Productivity and Decomposition in Ecosystem: Overview
This topic covers concepts such as Gross Primary Productivity, Net Primary Productivity, Secondary Productivity, Decomposition, Fragmentation of Detritus during Decomposition, Leaching during Decomposition, Catabolism during Decomposition, etc.
Important Questions on Productivity and Decomposition in Ecosystem
The amount of energy left in the producers after utilization of some energy for respiration is known as:
If joules of energy is available at the producer level as net primary productivity, then amount of energy available in secondary carnivore in joules.
Name the process by which detritus is changed into dark-coloured amorphous substance called humus.(Humification/ Manure/ Fertilizer)
What would happen if all the bacteria and fungi of the world are destroyed?
Choose the incorrect property with respect to characteristics of humus.
The rate of organic matter created by photosynthesis minus the rate of respiration and other losses by a plant is called
Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem?
Which factor/s is responsible for controlling the rate of decomposition?
Which of the following is not a characteristic feature of the humus?
The rate of synthesis of organic matter by consumers is:
What will happen if decomposers are completely removed from the ecosystem?
________________ leads to accumulation of a dark coloured amorphous substance called ________ that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate.
Read the below given statements with respect to three important steps of decomposition: fragmentation, leaching and catabolism. Select the correct option.
(i) Detritivores {e.g., earthworm) breakdown detritus into smaller particles.
(ii) Water soluble inorganic nutrients go down into soil horizon and get precipitated as unavailable salts.
(iii) Decomposers (e.g., bacteria and fungi) secrete digestive enzymes and degrade detritus into simpler inorganic substance.
| Leaching | Fragmentation | Catabolism | |
|---|---|---|---|
| (i) | (ii) | (iii) | |
| (iii) | (ii) | (i) | |
| (ii) | (i) | (iii) | |
| (ii) | (iii) | (i) |
NPP (net primary productivity) is highest in
Arrange the following ecosystems in the decreasing order of their mean net primary productivity (tons/hectare/year).
I. Tropical deciduous forest
II. Temperate coniferous forest
III. Tropical rain forests
IV. Temperate deciduous forest
V. Desert scrub
Detritivores break down detritus into smaller particles. This process is called
The rate at which light energy is converted into chemical energy of organic molecules in the ecosystem is:
Which of the following ecosystem has the highest gross primary productivity
Which of the following is the organic matter of animal and vegetable origin in the soil?
Which of the following compounds are decomposed during putrefaction
