Photosynthesis
What process do plants use to make their own food?
Photosynthesis
How do animals and humans get food?
By eating other organisms.
How do plants contribute to the oxygen we breathe?
They release oxygen as a byproduct of photosynthesis.
Where does digestion begin?
In the mouth.
What is a producer?
A producer is an organism that can make its own food, usually through the process of photosynthesis.
What is photosynthesis?
The process by which plants use sunlight, water, and carbon dioxide to make food (glucose) and oxygen.
What do teeth do to food?
Break it down into smaller pieces.
How do animals contribute to the carbon dioxide-oxygen cycle?
By breathing in oxygen and releasing carbon dioxide through respiration.
What does saliva do?
Helps break down food chemically.
What is an autotroph?
An organism that makes its own food (e.g., plants).
What are the raw materials needed for photosynthesis?
Sunlight, water (H₂O), and carbon dioxide (CO₂).
Why do humans need a digestive system?
To break down food and absorb nutrients.
Why is the carbon dioxide-oxygen cycle important for the biosphere?
It maintains the balance of gases needed for life on Earth.
What is food called before swallowing?
A bolus.
What is a heterotroph?
An organism that must eat other organisms for energy (e.g., humans, animals).
What type of organism can perform photosynthesis?
Producers or autotrophs (e.g., plants).
How do plants and animals differ in how they get energy?
Plants make their own food through photosynthesis; animals eat other organisms.
What two gases are involved in the carbon dioxide-oxygen cycle?
Carbon dioxide (CO₂) and oxygen (O₂).
Where does the last part of digestion take place?
The large intestine.
What does the term "photosynthesis" mean?
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to make food (glucose) and oxygen.
Explain how photosynthesis supports life on Earth.
It provides food (energy) for plants and oxygen for animals and humans to breathe.
What is the main energy source for all living things?
The Sun (directly or indirectly).
Describe the full oxygen-carbon dioxide cycle between plants and animals.
Plants take in CO₂ and release O₂ through photosynthesis; animals take in O₂ and release CO₂ through respiration.
Why is the mouth important in the digestive system?
It starts digestion by mechanically breaking down food with teeth and chemically with saliva.
Define “bolus.”
Food before it is swallowed in the mouth.