Home
Class 12
BIOLOGY
Which of the following statements regard...

Which of the following statements regarding decomposition is false?
I. Warm and moist favours decomposition.
II. Decomposition rate is slower if detritus is rich in chitin and lignin.
III. Earthworm is detritus.
IV. Precipitation of soluble inorganic nutrients in the soil horizon as unavailable salt is called mineralization.
V. Detritus is the raw material for decomposition.

A

Only II

B

Only I

C

Only IV

D

OnlyV

Text Solution

AI Generated Solution

The correct Answer is:
To determine which statement regarding decomposition is false, we will analyze each statement one by one. ### Step-by-Step Solution: 1. **Statement I: Warm and moist favors decomposition.** - This statement is **true**. Warm and moist conditions are ideal for microbial activity, which accelerates the decomposition process. 2. **Statement II: Decomposition rate is slower if detritus is rich in chitin and lignin.** - This statement is **true**. Chitin and lignin are complex organic compounds that are difficult for decomposers to break down, leading to a slower decomposition rate. 3. **Statement III: Earthworm is detritus.** - This statement is **false**. Earthworms are not detritus; they are decomposers that feed on detritus. Detritus refers to dead organic matter, while earthworms break it down. 4. **Statement IV: Precipitation of soluble inorganic nutrients in the soil horizon as unavailable salt is called mineralization.** - This statement is **false**. The term "mineralization" refers to the process where organic matter is converted into inorganic nutrients that are available for plant uptake. The precipitation of these nutrients as unavailable salts is not mineralization. 5. **Statement V: Detritus is the raw material for decomposition.** - This statement is **true**. Detritus, which includes dead plant and animal matter, serves as the primary raw material for the decomposition process. ### Conclusion: The false statements are **Statement III** (Earthworm is detritus) and **Statement IV** (Precipitation of soluble inorganic nutrients in the soil horizon as unavailable salt is called mineralization). However, since we are looking for one false statement, the most clearly incorrect one is **Statement III**. ### Final Answer: **Statement III is false: Earthworm is detritus.** ---
Promotional Banner

Similar Questions

Explore conceptually related problems

(A) : Decomposition is largely an oxygen requiring process. (R) : Decomposition rate is faster in detritus rich in lignin and chitin.

Select the correct statement(s) (A) The factors affecting decomposition are chemical nature of detritus and the climatic factors (B) If detritus is rich in lignin, and chitin decomposition is very fast (C ) Decomposition is very slow, if the detritus is rich in nitrogen (D) Detritus is the raw material for decomposition

Fragmentation, leaching and catabolism are some of the important steps of decomposition. Study the following statements I , ii and iii regarding these and 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 substances.

How many of the following statements are incorrect ? (i) Decomposition is largely an anaerobic process . (ii) Fragmentation , leaching , and catabolism occur simultaneously on detritus. (iii) The vertical distribution of different species occupying different levels is called stratification . (iv) The pond is a deep water body . (v) The rate of decomposition is controlled by the chemical composition of detritus and climatic factors.

Which of the following statement(s) regarding energy flow is/are false? I. The detritus food chain begins with dead organic matter. II. In aquatic ecosystem, detritus food chain is the major conduit for energy flow. III. In terrestrial ecosystem a larger fraction of energy flows through grazing food chain. IV. Producers belong to the first trophic level of the food chain.

Which of the following statements are not correct in reference to hydroponics? I. It determines the mineral nutrients essential for the plants. II. The hydroponics involves the culture of plants in soil and defined mineral solution. III. Hydroponics requires purified water with non-defined mineral nutrient salts. IV. In the hydroponics technique, plants are grown in sandy soil with nutrient solution. V. By this method, essential elements required for the growth of plants can be identified and their deficiency symptoms can also be discovered

Which of the following statements are correct ? I. On decomposition of H_2O_2 , 1O_2 gas is released . II. 2-ethylanthraquinol is used in preparation of H_2O_2 . III. On heating KClO_3, Pb(NO_3)_2, NaNO_3, O_2 gas is released. IV In the preparation of sodium peroxoborate, H_2O_2 is treated with sodium metaborate