Chapter 5 | Where does our food come from?

Plants are called producers because

• They consume other organisms for food.
• They rely on animals for food.
• They obtain energy from the sun.
• They produce their own food through photosynthesis.

Nitrogen is recycled in an eco-system. In what way is nitrogen present in animals?

• Proteins and nucleic acids
• Water and electrolytes
• Vitamins and minerals
• Carbohydrates and lipids

Which organism always gets its energy from dead matter?

• consumer
• producer
• predator
• decomposer

What is the process by which nitrogen is recycled in an ecosystem?

• Photosynthesis

• Decomposition

• Respiration

• Transpiration

Which organism is responsible for breaking down dead matter in an ecosystem?

• Producer

• Consumer

• Predator

• Decomposer

What is the main source of energy for plants?

• Other organisms

• The sun

• Water and minerals

• Air and sunlight

What eventually happens to all the energy in an eco-system?

• The energy is transferred to the sun.
• The energy is converted into matter.
• The energy is lost as heat.
• The energy is stored in the organisms.

Nitrates can be removed from the soil by the action of

• nitrogen-fixing bacteria in decaying plants.

• bacteria in the root nodules of legumes

• nitrogen-fixing bacteria in ammonium compounds.

• denitrifying bacteria in poor air conditions.

Label [1] in the diagram.

Label [2] in the diagram.