Producers, consumers and decomposers Knowledge-Based Download PDF

Questions

1. 1.

   Which of the following characteristics is shared by both consumers and decomposers, distinguishing them from producers in an ecosystem?

   • A) They are heterotrophic organisms that rely on organic compounds produced by other organisms for their carbon and energy.
   • B) They synthesize high-energy organic molecules directly from inorganic carbon dioxide and water.
   • C) They absorb solar radiation to convert light energy into chemical potential energy stored in carbohydrates.
   • D) They release mineral nutrients back into the physical environment through the exclusive use of external digestion.
2. 2.

   Which of the following statements correctly distinguishes the movement of energy from the movement of chemical matter among producers, consumers, and decomposers in an ecosystem?

   • A) Energy is completely recycled back to producers by decomposers, whereas chemical matter continuously dissipates from the ecosystem as metabolic heat.
   • B) Both energy and chemical matter circulate indefinitely through producers, consumers, and decomposers without requiring continuous external inputs.
   • C) Chemical matter cycles repeatedly among producers, consumers, and decomposers, whereas energy flows unidirectionally and is progressively lost as heat.
   • D) Consumers synthesize inorganic nutrients into organic molecules, whereas decomposers convert solar radiation into chemical energy.
3. 3.

   Which of the following statements accurately characterizes consumers in an ecosystem?

   • A) They synthesize their own organic molecules directly from atmospheric carbon dioxide and inorganic compounds.
   • B) They secrete digestive enzymes externally into the environment to break down non-living detritus into inorganic minerals.
   • C) They fix radiant solar energy into chemical energy that serves as the primary energy base of the food web.
   • D) They obtain their energy and organic nutrients by ingesting living or recently killed organisms.
4. 4.

   In an ecosystem, which of the following ecological functions is carried out exclusively by producers?

   • A) Generating adenosine triphosphate (ATP) through the breakdown of carbohydrate molecules
   • B) Transferring thermal energy to the surrounding abiotic environment during metabolic work
   • C) Recycling mineral elements back into the soil through the digestion of biological wastes
   • D) Converting inorganic carbon into chemical energy stored in organic macromolecules
5. 5.

   Which of the following statements correctly describes the fundamental ecological role of decomposers in an ecosystem compared to producers and consumers?

   • A) They capture radiant energy from sunlight to synthesize organic molecules from carbon dioxide.
   • B) They ingest living plant tissue directly to transfer chemical energy to higher trophic levels.
   • C) They break down organic matter from dead organisms and wastes, returning inorganic nutrients to the physical environment.
   • D) They absorb metabolic heat lost by consumers to regenerate chemical potential energy for producers.