Question

prediction
tube
light exposure
a dark
b dark
c dark
d dark
e light
f light
g light
h light
solution on day 1
low co₂ solution only + elodea
low co₂ solution only
high co₂ solution only + elodea
high co₂ solution only
low co₂ solution only + elodea
low co₂ solution only
high co₂ solution only + elodea
high co₂ solution only
photosynthesis: sunlight (energy) +6co₂ + 6h₂o → c₆h₁₂o₆ + 6o₂

1. what 3 things does a plant need to do photosynthesis?
2. which tube has the things that are needed for photosynthesis?
3. how will you know that photosynthesis has happened?

Explanation:

1. A plant needs sunlight (energy), carbon - dioxide ($CO_2$), and water ($H_2O$) for photosynthesis.
2. Tube G has light exposure, elodea (a plant), and high $CO_2$ solution, which contains the key elements for photosynthesis.
3. Evidence of photosynthesis can be the production of oxygen. In an experiment, we can look for bubbles (oxygen gas) produced by the elodea as an indication that photosynthesis has occurred.

Answer:

1. Sunlight (energy), carbon - dioxide ($CO_2$), water ($H_2O$)
2. Tube G
3. Look for the production of oxygen bubbles by the elodea