Plant Systems
Where does most photosynthesis happen in a plant?
Leaves
What was the independent variable in the lab?
Light (light vs dark)
Matter is:
A. created
B. destroyed
C. rearranged
C. rearranged
What is cellular respiration?
Breaking down sugar for energy
Photosynthesis makes:
Sugar + oxygen
What enters the plant through the roots?
Water
What did the iodine test show?
Starch (plant food)
Where does carbon in plants come from?
Carbon dioxide in the air
Who does cellular respiration?
Both plants and animals
Respiration produces:
Carbon dioxide
What gas enters the plant through stomata?
Carbon dioxide (CO₂)
Which plant made more starch: light or dark?
Light
Where does hydrogen in sugar come from?
Water
What is used in respiration?
Sugar + oxygen
How are photosynthesis and respiration connected?
Products of one are reactants of the other
Why are leaves good for photosynthesis? (2 reasons)
Large surface area + get lots of sunlight
What does starch tell us about photosynthesis?
That sugar was made
What happens to atoms during photosynthesis?
They rearrange to form sugar
What is released during respiration?
Carbon dioxide + energy
Why are plants important to animals?
They provide oxygen and food
Explain how different parts of a plant work together to make food.
Roots take in water, leaves capture light, stomata take in CO₂ → photosynthesis makes sugar
That sugar was made
Because light provides energy for photosynthesis → more sugar → more starch
Explain why matter does NOT disappear in photosynthesis.
Atoms are conserved and rearranged into new molecules
Why do organisms need cellular respiration?
To release energy stored in sugar
Explain how plants and animals depend on each other.
Plants make oxygen and sugar; animals use them and return CO₂