7.4.1 Trophic Levels and Biomass

• Trophic levels represent the transfer of energy and matter through an ecosystem.
• Match the trophic level with its description:

  Secondary Consumers ↔️ Feed on primary consumers

  Decomposers ↔️ Break down dead matter

  Producers ↔️ Create their own food

  Primary Consumers ↔️ Feed on producers
• Arrange the following processes in the correct order to explain why biomass decreases at each trophic level:

  1️⃣ Respiration

  2️⃣ Waste production

  3️⃣ Energy loss as heat
• Producers form the base of the food chain by providing energy and nutrients to consumers.


  True
• Match the trophic level with its description:

  Producers ↔️ Organisms that produce their own food

  Primary Consumers ↔️ Organisms that feed on producers

  Secondary Consumers ↔️ Organisms that feed on primary consumers

  Tertiary Consumers ↔️ Organisms that feed on secondary consumers
• The biomass decreases at each successive trophic level due to energy losses.


  True
• Producers form the base of the food chain in an ecosystem.
• What is the role of decomposers in an ecosystem?

  Recycle nutrients
• Herbivores obtain their energy by feeding on plants
• Consumers rely on producers for their initial energy source
• Decomposers break down dead matter to release energy.


  True
• What is one method used to measure biomass directly?

  Weighing organisms after drying
• Match the biomass measurement method with its application:

  Direct Weighing ↔️ Small-scale biomass assessment

  Remote Sensing ↔️ Large-scale biomass estimation

  Quadrat Sampling ↔️ Sampling representative areas
• Order the trophic levels in a biomass pyramid from highest to lowest biomass:

  1️⃣ Producers

  2️⃣ Primary Consumers

  3️⃣ Secondary Consumers

  4️⃣ Tertiary Consumers
• Energy losses between trophic levels are primarily due to respiration
• The biomass pyramid highlights the vulnerability of higher trophic levels to disruptions.


  True
• What are four processes that contribute to energy loss between trophic levels?

  Respiration, Digestion, Waste, Heat Loss
• Producers are organisms that can produce their own food, usually through photosynthesis.


  True
• What do primary consumers feed on?

  Producers
• Producers, such as plants and algae, use photosynthesis to convert sunlight into glucose.
• What is the role of chemosynthesis in some bacteria?

  To create energy
• Trophic levels represent the transfer of energy and matter through an ecosystem.
• What process do producers primarily use to create energy?

  Photosynthesis
• Omnivores consume only plants in their diet.

  False
• What are consumers classified into based on their diet?

  Herbivores, Carnivores, Omnivores
• What type of diet do omnivores have?

  Plants and Animals
• What role do decomposers play in an ecosystem?

  Recycling nutrients
• Biomass measures the total mass of living organisms in a specific area
• Remote sensing uses aerial photography to estimate biomass.


  True
• What does the biomass pyramid illustrate?

  Biomass at each trophic level
• Approximately 10% of energy is transferred between trophic levels in a biomass pyramid.


  True
• Why is the biomass pyramid significant?

  Illustrates limited energy flow
• Energy transfer efficiency between trophic levels is about 10%
• Higher trophic levels have larger biomass and population sizes due to efficient energy transfer.

  False