Which of the following is an example of a decomposer at work in the food web? A. A fungus growing on a log B. A tree growing in a field C. A grasshopper eating leaves D. A seagull catching a fish
The Correct Answer and Explanation is:
The correct answer is A. A fungus growing on a log.
A decomposer is an organism that breaks down dead or decaying organic material, recycling nutrients back into the ecosystem. Decomposers are essential for the health of ecosystems because they ensure that nutrients, such as carbon, nitrogen, and phosphorus, are made available to other organisms, especially plants, which require these elements for growth. Common decomposers include fungi, bacteria, and certain types of insects.
In this case, a fungus growing on a log is an example of a decomposer. The fungus breaks down the wood of the log, which is made up of complex organic molecules, into simpler compounds that can be absorbed and used by the fungus for energy. As the fungus decomposes the log, it releases important nutrients into the soil, which can then be taken up by plants and reused in the food web.
Here’s a breakdown of the other options:
- B. A tree growing in a field: A tree is a producer in the food web. It uses photosynthesis to produce its own food (glucose) from sunlight, water, and carbon dioxide. It does not decompose other organisms.
- C. A grasshopper eating leaves: A grasshopper is a primary consumer, not a decomposer. It feeds on producers (plants) in the food web.
- D. A seagull catching a fish: A seagull is a predator, not a decomposer. It preys on fish, which are primary consumers or producers in the food web, depending on the type of fish.
In conclusion, fungi are key players in the recycling of organic matter and nutrient cycling in ecosystems. They help break down complex organic substances, allowing other organisms to benefit from these nutrients.
