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.

Subtopic:  Decomposition |
 79%
From NCERT
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Which of the following is the substrate in the process of mineralisation?

1. Detritus

2. Humus

3. Organic matter

4. None of the above

Subtopic:  Decomposition |
 71%
From NCERT
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Which of the following does not affect rate of decomposition?

1. Substrate composition

2. Soil moisture

3. Temperature of soil

4. CO₂

Subtopic:  Decomposition |
 82%
From NCERT
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Decomposition would be fast if the detritus contains-

1. Cellulose

2. Lignin and chitin

3. Nitrogen and water soluble sugars

4. Cellulose and pectin

Subtopic:  Decomposition |
 87%
From NCERT
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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

Subtopic:  Decomposition |
 92%
From NCERT
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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

Subtopic:  Energy Flow |
 74%
From NCERT
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What percentage of the incident solar radiation is photosynthetically active radiation (PAR)?

1. 50%

2. Less than 50%

3. More than 50%

4.10%

Subtopic:  Energy Flow |
 86%
From NCERT
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What proportion of the PAR (photosynthetically active radiation) is captured by plants?

1. 1 - 10%

2. 2 - 10%

3. 5 - 15%

4. 5 - 25%

Subtopic:  Energy Flow |
 81%
From NCERT
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Which of the following statement is incorrect?

1. Ecosystems are exempted from the Second Law of thermodynamics.
2. An ecosystem has a tendency toward increasing disorderliness.
3. Flow of energy is unidirectional from the sun to producers and then to consumers.
4. All organisms are dependent for their food on producers, either directly or indirectly
Subtopic:  Energy Flow |
 68%
From NCERT
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Which are the primary consumers in a grazing food chain?

1. Carnivores

2. Herbivores

3. Detrivores

4. Omnivores

Subtopic:  Energy Flow |
 91%
From NCERT
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