Decomposition Cycle

Q.

What is the role of decomposers in the ecosystem?

Q.

What is humus?

Q.

Define decomposition and describe the processes and products of decomposition.

Q.

Which of the following is not a part of the decomposition process?

1. Catabolism

2. Humification, mineralization

3. Fragmentation and leaching

4. Sedimentation, aeration

Q. Match the following enzymes in column I with the correct target cell in column II

Column-I	Column-II
A. Cellulase	1. Fungal cell
B. Lysozyme	2. Plant cell
C. Chitinase	3. Bacterial cell

Choose the correct option

1. A-3, B-2, C-1
2. A-3, B-1, C-2
3. A-2, B-1, C-3
4. A-2, B-3, C-1

Q. Which of the following is not true for humus?

1. Produced by the process of mineralisation
2. Dark colored amorphous substance
3. Highly resistant to microbial action
4. Composed of complex phenolic compounds

Q. How many of the following statements are true about humus?
I. It is highly susceptible to microbial action
II. It is dark and amorphous in nature
III. It serves as a reservoir of nutrients
IV. It decomposes very slowly

1. 1
2. 2
3. 3
4. 4

Q. Which of the following statement about decomposition is incorrect?

1. Decomposers break down complex organic matter into inorganic substances
2. Water insoluble organic nutrients go down into the soil horizon during the process of leaching
3. In fragmentation, detrivores break down detritus into smaller particles
4. Saprophytic bacteria and fungi secrete digestive enzymes over the fragmented detritus

Q.

Define decomposition. Describe the process products of decomposition?

Q.

Differentiate between humification and mineralization.

Q. Humus serves as a reservoir of ___.

1. Nutrients
2. Compounds
3. Carbon
4. All of the above

Q. Nitrogenase is enzyme which converts N${}_2$ into NH${}_3$, it is:

1. Inhibited by pigment leghaemoglobin
2. Oxygen sensitive
3. Found in all prokaryotes
4. Copper containing enzyme

Q.

How do you distinguish between humification and mineralisation?

Q. Which of the following is not a characteristic of humus?

1. It is rich in organic matter such as lignin and cellulose
2. It is colloidal in nature and serves as a reservoir of nutrients
3. It is further degraded by the process of humification
4. None of the above

Q. Who accepts the nutrient released in environment by decomposer?

1. Producers
2. Secondary consumers
3. None of the above
4. Consumers

Q.

Which of the following process helps in nutrient conservation

1. Mineralisation

2. Immobilisation

3. Leaching

4. Nitrification

Q.

Define decomposition and describe the processes and products of decomposition.

Q. Which of the following is not true for humus?

1. Dark colored amorphous substance
2. Highly resistant to microbial action
3. Composed of complex phenolic compounds
4. Produced by the process of mineralisation

Q. is a process by which simplified detritus gets converted into a dark formless substance which is highly resistant to microbial action.

1. Humification
2. Mineralisation
3. Leaching

Q. Fill in the following blanks with suitable words:​ ​
(a) Decomposer organisms are______ in their action.​

Q. Which of the following processes leads to enrichment of soil by nutrients?

1. Leaching
2. Humification
3. Fragmentation
4. All of the above

Q. Why animals can not carry out gluconeogenesis?

Q. Which of the following processes leads to enrichment of soil by nutrients?

1. Leaching
2. Humification
3. Fragmentation
4. All of the above

Q. Which of the following statement about decomposition is incorrect?

1. Decomposers break down complex organic matter into inorganic substances
2. Water insoluble organic nutrients go down into the soil horizon during the process of leaching
3. In fragmentation, detrivores break down detritus into smaller particles
4. Saprophytic bacteria and fungi secrete digestive enzymes over the fragmented detritus

Q. Extracellular enzymes that play a role in decomposition are

1. Cellulases and nitrogenase
2. Cellulases and zymase
3. Cellulases and proteases
4. Cellulases and oxygenases

Q. Who coined the term zymase for enzymes in Yeast?

1. Buchner
2. Kuhne
3. Pasteur
4. Sumner

Q. Bacteria are essential in carbon cycle as a

1. Decomposer
2. Synthesizer
3. Consumer
4. Primary producers

Q. Which of the following processes leads to enrichment of soil by nutrients?

1. Leaching
2. Humification
3. Fragmentation
4. All of the above

Q.

Define decomposition and describe the processes and products of decomposition.

Q. is a process by which simplified detritus gets converted into a dark formless substance which is highly resistant to microbial action.

1. Humification
2. Mineralisation
3. Leaching