Energy
What is the SI unit of energy?
joule (J)
What gas is needed for photosynthesis?
Carbon dioxide (CO₂)
Where does most absorption occur?
Small intestine
What gas is needed for aerobic respiration?
Oxygen
What is a producer?
A producer is an organism that makes its own food, usually through photosynthesis.
What type of energy is stored in food?
Chemical energy
What substance in leaves absorbs light?
Chlorophyll
What is digestion?
The breakdown of large, complex food molecules into smaller, soluble molecules that can be absorbed.
Where does aerobic respiration occur?
Mitochondria
Identify the producer: Grass → Grasshopper → Lizard → Snake
Grass
What happens to energy when a football player runs?
Chemical energy is converted into kinetic energy (movement), with some energy released as heat.
What substance in leaves absorbs light?
Glucose
What is assimilation?
The process by which absorbed nutrients are taken into cells and used by the body.
What is ATP?
ATP (adenosine triphosphate) is the main usable energy-carrying molecule in cells.
Which organism has the most energy?
Grass, because producers have the greatest amount of energy available in the food chain.
Why isn't all energy converted into movement?
Some energy is transferred to the surroundings as heat and sound, so not all of it becomes movement.
What is the main product of photosynthesis?
Carbon dioxide + water → glucose + oxygen (in the presence of light and chlorophyll)
What is the role of enzymes in digestion?
Enzymes speed up the breakdown of food into smaller molecules that can be absorbed.
Give two products of aerobic respiration.
Carbon dioxide and water.
What could happen if the grasshopper population decreases?
The lizard population may decrease because there would be less food available. The grass population may increase because fewer grasshoppers are feeding on it.