Q. No.What is the process by which Detritivores break down the detritus into smaller particles.?
1. Degradation
2. Decomposition
3. Fragmentation
4. Leaching
What does the process of leaching refers to-
| 1. | Accumulation of a dark coloured amorphous substance |
| 2. | Organic solvents reabsorbed by the plants |
| 3. | Inorganic solvents get precipitated out of the soil |
| 4. | Water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts. |
In the process of decomposition ‘catabolism’ is performed by-
1. Earthworms
2. Bacteria
3. Bacteria and fungi
4. Fungi
Which of the following statement is incorrect?
| 1. | All the steps in decomposition operate simultaneously on the humus. |
| 2. | Humus is an accumulated dark coloured amorphous substance. |
| 3. | Humus is highly resistant to microbial action and undergoes decomposition at an extremely slow rate. |
| 4. | Being colloidal in nature humus serves as a reservoir of nutrients. |
Which of the following is the substrate in the process of mineralisation?
1. Detritus
2. Humus
3. Organic matter
4. None of the above
Which of the following does not affect rate of decomposition?
1. Substrate composition
2. Soil moisture
3. Temperature of soil
4. CO₂
Decomposition would be fast if the detritus contains-
1. Cellulose
2. Lignin and chitin
3. Nitrogen and water soluble sugars
4. Cellulose and pectin
Which of the following promotes the process of decomposition?
1. Warm and moist environment
2. low temperature
3. Anaerobiosis
4. Lignin and chitin-rich detritus
What is the source of energy for all ecosystems on Earth, except for the deep sea hydro-thermal ecosystem?
1. Sun
2. Hydrothermal vents
3. Lava
4. Water
What percentage of the incident solar radiation is photosynthetically active radiation (PAR)?
1. 50%
2. Less than 50%
3. More than 50%
4.10%
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