SAVE MY EXAM 2.2 - CHOOSE

What is the primary source of energy for ecosystems?

• Chemical energy

• The Sun

• Fossil fuels

• Heat from Earth's core

Why are food webs more accurate than food chains?

• They eliminate energy loss

• They show multiple feeding relationships

• They are easier to understand

• They only include producers

What limits the length of food chains?

• Heat loss at each trophic level

• Unlimited producer biomass

• Efficient energy recycling

• Absence of decomposers

What is the role of decomposers in ecosystems?

• Consuming producers

• Recycling nutrients

• Storing energy in biomass

• Limiting energy transfer

Which law explains the inefficiency of energy transfer?

• First law of thermodynamics

• Law of conservation of mass

• Second law of thermodynamics

• Law of energy stability

What happens to energy lost as heat in ecosystems?

• It is recycled by decomposers

• It exits the ecosystem

• It is stored in biomass

• It returns to producers

Why are lower trophic levels more energy-efficient?

• They store biomass more effectively

• They experience less energy loss

• They rely on decomposers for energy

• They produce glucose directly from heat

What distinguishes energy flow from nutrient cycling?

• Energy flows one way; nutrients cycle

• Energy is recycled; nutrients are linear

• Both are cyclic processes

• Nutrients are lost as heat

Why are primary producers essential?

• They consume decomposers

• They convert light energy into chemical energy

• They prevent biomass accumulation

• They store heat energy

Which trophic level contains the most energy?

• Secondary consumers

• Apex predators

• Primary producers

• Decomposers