Chapter 3, Problem 7STP

Summary Introduction

Introduction :

Decomposition is the process, by which the organic material is converted into the inorganic material. The organisms involved in the decomposition process are known as decomposers.

Answer to Problem 7STP

Correct answer :

Option (c) a fungus that obtain food from dead logs.

Explanation of Solution

Explanation/justification for the correct answer :

Option (c) a fungus that obtain food from dead logs. The fungi digest the food externally. They release chemicals that convert the surrounding food material into smaller compounds, which they use as nutrients. In this case, the digestive enzymes from the fungi would convert organic matter of the dead log to inorganic nutrient, hence, fungus is a decomposer.

Explanation for incorrect answer :

Option (a) bacteria that make food from inorganic compound. Here the bacteria is not using the organic material from the dead remaining of an organism. Hence, it is not a process of decomposition. Hence, it is an incorrect answer.

Option (b) a clam that takes water and filter food. This is the process of filter feeding, in this case, no conversion of the organic material takes place. Hence, it is an incorrect answer.

Option (d) plants that make food using sunlight. This process is called photosynthesis. In this process, inorganic material is converted into molecules used as food source. It is almost opposite of decomposition. Hence, it is an incorrect answer.