1. What is the ultimate source of energy for all living organisms on Earth?
a) Sun
b) Moon
c) Stars
d) Planets
2. Which process involves the conversion of light energy from the sun into chemical energy stored in glucose molecules?
a) Photosynthesis
b) Respiration
c) Decomposition
d) Fermentation
3. What is the primary role of producers in an ecosystem?
a) Break down dead organisms
b) Consume other organisms for energy
c) Convert sunlight into food energy
d) Regulate the environment
4. What is the ultimate fate of energy in an ecosystem?
a) It is recycled continuously
b) It is lost as heat
c) It is stored in organic molecules
d) It is consumed by decomposers
5. Which organism is responsible for breaking down dead organic matter and returning nutrients to the soil?
a) Producer
b) Consumer
c) Decomposer
d) Predator
6. How do energy and matter flow through an ecosystem?
a) Energy flows in one direction, while matter cycles
b) Matter flows in one direction, while energy cycles
c) Both energy and matter flow in one direction
d) Both energy and matter cycle through the ecosystem
7. What is a trophic level in an ecosystem?
a) The amount of energy available at each level
b) The number of different species in an ecosystem
c) The position an organism occupies in a food chain
d) The rate at which producers photosynthesize
8. What happens to energy as it is transferred between trophic levels in a food chain?
a) The energy decreases
b) The energy increases
c) The energy remains constant
d) The energy transforms into matter
9. Which process releases carbon dioxide into the atmosphere as a byproduct?
a) Photosynthesis
b) Respiration
c) Decomposition
d) Fermentation
10. How does the carbon cycle connect living organisms in an ecosystem?
a) By transferring energy between organisms
b) By recycling nutrients and matter
c) By regulating temperature and climate
d) By producing oxygen for respiration.
Matter and Energy Flow Unit Test
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