Ecosystem Dynamics and Interactions

Ecosystems are communities of living organisms interacting with their environment. Plants, as primary producers, convert CO2 and water into energy-rich carbohydrates using sunlight. Consumers, or heterotrophs, rely on these molecules for energy. Energy and nutrients cycle through ecosystems as organisms consume each other, with some energy lost as heat. Ecosystems are dynamic, with populations fluctuating and adapting to climatic changes. Diverse ecosystems tend to be more stable, though natural disasters can disrupt them. Coral reefs exemplify diverse ecosystems, thriving for millions of years with complex interactions among species.

What is the primary role of plants in an ecosystem?

• They consume other organisms.

• They produce energy-containing molecules.

• They decompose organic matter.

• They provide shelter for animals.

Which of the following is NOT a component of an ecosystem?

• Artificial structures

• Living organisms

• Non-living environment

• Energy flow

Which term describes organisms that do not perform photosynthesis?

• Autotrophs

• Producers

• Heterotrophs

• Decomposers

What happens to the energy from a consumed organism?

• It is expelled as waste or integrated into biomass.

• It is entirely lost as heat.

• It is used to produce oxygen.

• It is stored as carbohydrates.

How do death and decay contribute to an ecosystem?

• They return nutrients to producers and the atmosphere.

• They stabilize the climate.

• They reduce biodiversity.

• They increase the number of consumers.

What factor generally contributes to the stability of an ecosystem?

• Low biodiversity

• High biodiversity

• Constant temperature

• Frequent natural disasters

Which event is likely to alter a stable ecosystem?

• A seasonal change

• A new species introduction

• A natural disaster

• A slight temperature change

What is a key feature of coral reefs as ecosystems?

• They have a symbiotic relationship with algae.

• They are not affected by human activities.

• They are primarily composed of a single species.

• They have existed for a short period.

What role do tiny algae play in coral reef ecosystems?

• They are decomposers.

• They are primary consumers.

• They are producers.

• They are predators.

What is the significance of symbiotic relationships in ecosystems?

• They enhance survival and functioning of ecosystems.

• They decrease biodiversity.

• They are rare and insignificant.

• They are harmful to one of the organisms involved.