Ecosystem Energy and Productivity Concepts

This video by Mr. Andersen explores energy flow in ecosystems, focusing on the role of producers and consumers. It explains how energy from the sun and chemicals is converted into usable forms through photosynthesis and chemosynthesis. The video discusses productivity, energy transfer, and efficiency in ecosystems, using ecological pyramids to illustrate these concepts. It compares productivity across various biomes and highlights the importance of understanding energy dynamics in ecological systems.

What is the primary source of energy for ecosystems on Earth?

• The Moon

• The Sun

• Volcanic Activity

• Ocean Currents

Which process allows plants to convert sunlight into chemical energy?

• Fermentation

• Respiration

• Photosynthesis

• Chemosynthesis

Which of the following is a chemical used in chemosynthesis?

• Nitrogen

• Oxygen

• Hydrogen Sulfide

• Carbon Dioxide

What is the main difference between gross primary productivity and net primary productivity?

• Gross is measured in water, net in air

• Gross includes respiration, net does not

• Net is only for aquatic plants

• Net includes respiration, gross does not

Which biome is known for having the highest productivity?

• Tundra

• Savanna

• Desert

• Tropical Rainforest

How does the productivity of coral reefs compare to that of cultivated land?

• Cultivated land is more productive

• They have the same productivity

• Coral reefs are more productive

• Coral reefs are less productive

What causes the seasonal changes in net primary productivity?

• Animal migration

• Changes in sunlight

• Ocean currents

• Volcanic eruptions

What percentage of energy typically transfers from one trophic level to the next?

• 90%

• 1%

• 50%

• 10%

In an ecological pyramid, which level contains the most biomass?

• Tertiary consumers

• Secondary consumers

• Primary consumers

• Producers

What role do decomposers play in an ecosystem?

• They produce energy

• They consume producers

• They increase biomass

• They recycle nutrients