Question

model 1 - photosynthesis in an aquatic plant
why?
when scientists do an experiment, they first decide what the variables are that may affect the outcome of the experiment. a variable is anything that may change during an experiment and that may cause the results to vary. a well - designed experiment will test only one variable at a time. the most important factor is that the variable is controlled in the experiment. in a controlled experiment, the test group and the control group are identical except for one variable.
experimental variables
what is measured during a controlled experiment?

1. the diagram in model 1 illustrates a dipping of an aquatic plant in water.
2. what gas is the plant producing?

• hydrogen
• nitrogen
• carbon dioxide
• oxygen

1. what source of energy is the plant using to carry out the process needed to produce the gas?
2. what process is occurring in the plant cells to produce the gas that is the bubbles due to appear?
3. why does the plant need light to be able to produce the gas?
4. why does the control group in an experiment have to be as similar as possible to the test group?
5. depending on the environment the plant is in, the rate of gas production from the aquatic plant in model 1 may be measured by counting the number of gas bubbles produced in a given time period.
6. why does the aquatic plant in model 1 need carbon dioxide to be able to produce the gas?
7. why does the aquatic plant in model 1 need water to be able to produce the gas?

Explanation:

During photosynthesis, plants use carbon - dioxide and water to produce glucose and oxygen. Oxygen is the gas released as a by - product of this process.

Answer:

Oxygen