Ecology and Human Impact Quiz

Grade 8 · Science · Quiz

Test your knowledge of ecosystems, food webs, and how human activities affect the natural world.

Questions

1. In a food chain, which organisms are always at the first level (the base)?

   1. Herbivores
   2. Carnivores
   3. Producers
   4. Decomposers
   Show answer

   Answer: Producers

   Producers (plants, algae) use photosynthesis to capture solar energy and form the foundation of all food chains.

2. Which human activity most directly causes habitat loss?

   1. Recycling programs
   2. Deforestation
   3. Solar energy use
   4. Organic farming
   Show answer

   Answer: Deforestation

   Deforestation removes trees and vegetation, directly eliminating the habitats that countless species depend on for shelter, food, and reproduction.

3. The greenhouse effect is entirely caused by human activities.

   Show answer

   Answer: False

   The greenhouse effect is a natural process essential for life on Earth. Human activities (burning fossil fuels) are intensifying it, causing excess warming.

4. What happens to energy as it moves up a food chain?

   1. Energy increases at each level
   2. Energy remains constant
   3. About 90% of energy is lost at each level
   4. Energy doubles at each level
   Show answer

   Answer: About 90% of energy is lost at each level

   Only about 10% of energy is transferred from one trophic level to the next; the remaining ~90% is lost as heat during metabolic processes.

5. Which of the following best describes an ecosystem?

   1. Only the living organisms in an area
   2. Only the climate of a region
   3. All living and nonliving components interacting in an area
   4. A list of all species on Earth
   Show answer

   Answer: All living and nonliving components interacting in an area

   An ecosystem includes both biotic (living) and abiotic (nonliving) components and all their interactions in a defined area.

6. Carbon is returned to the atmosphere when organisms respire or when fuels are ______.

   Show answer

   Answer: burned

   Combustion of fossil fuels and organic matter releases carbon stored in organic molecules back into the atmosphere as CO₂.

7. Why is high biodiversity important for an ecosystem?

   1. It guarantees no species will ever go extinct
   2. It makes the ecosystem more resilient to disturbances
   3. It means there are more predators than prey
   4. It reduces the need for decomposers
   Show answer

   Answer: It makes the ecosystem more resilient to disturbances

   High biodiversity means more species can fill ecological roles, so if one species declines, others can compensate, maintaining ecosystem function.

8. An example of a conservation strategy is:

   1. Introducing new species to increase biodiversity
   2. Draining wetlands for agriculture
   3. Establishing protected national parks and wildlife refuges
   4. Increasing the use of pesticides on crops
   Show answer

   Answer: Establishing protected national parks and wildlife refuges

   Protected areas like national parks preserve habitat, reduce hunting pressure, and allow wildlife populations to recover and thrive.

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