final exam review homework #2 - due
photosynthesis
1. which of the following must be present for photosynthesis to happen?
a. glucose and oxygen
b. oxygen, sunlight, glucose
c. water, carbon dioxide, sunlight
d. water, oxygen, carbon dioxide
2. in a floating leaf disc experiment, students add less baking soda to beaker a and a normal amount to beaker b. they expect beaker bs discs to rise first. why?
a. the carbon dioxide will push the leaves upward.
b. more carbon dioxide → more photosynthesis → more oxygen to float the discs.
c. more carbon dioxide → more photosynthesis → more carbon dioxide to float the discs.
d. the discs absorb the baking soda directly.
3. if an organism is performing photosynthesis, what gas would its bubbles contain?
a. carbon dioxide
b. oxygen
4. a plant is in an indicator solution that turns green with oxygen. if the lamp is moved farther away, the indicator will change color…
a. faster
b. slower
c. at the same rate
5. after photosynthesis, the suns energy becomes stored as…
a. sunlight
b. carbon dioxide
c. oxygen
d. sugar / glucose / carbohydrate
6. only the leaf discs under strong light begin to float. why?
a. oxygen gas is a product of photosynthesis and forms bubbles.
b. nitrogen gas is a product of photosynthesis and forms bubbles.
c. carbon dioxide gas is a product of photosynthesis and forms bubbles.
d. water vapor forms inside the discs and lifts them.
7. photosynthesis helps reduce climate change by…
a. increasing oxygen in the atmosphere
b. decreasing carbon dioxide in the atmosphere
c. increasing carbon dioxide in the atmosphere
d. decreasing oxygen in the atmosphere

Question

final exam review homework #2 - due
photosynthesis
1. which of the following must be present for photosynthesis to happen?
   a. glucose and oxygen
   b. oxygen, sunlight, glucose
   c. water, carbon dioxide, sunlight
   d. water, oxygen, carbon dioxide
2. in a floating leaf disc experiment, students add less baking soda to beaker a and a normal amount to beaker b. they expect beaker bs discs to rise first. why?
   a. the carbon dioxide will push the leaves upward.
   b. more carbon dioxide → more photosynthesis → more oxygen to float the discs.
   c. more carbon dioxide → more photosynthesis → more carbon dioxide to float the discs.
   d. the discs absorb the baking soda directly.
3. if an organism is performing photosynthesis, what gas would its bubbles contain?
   a. carbon dioxide
   b. oxygen
4. a plant is in an indicator solution that turns green with oxygen. if the lamp is moved farther away, the indicator will change color…
   a. faster
   b. slower
   c. at the same rate
5. after photosynthesis, the suns energy becomes stored as…
   a. sunlight
   b. carbon dioxide
   c. oxygen
   d. sugar / glucose / carbohydrate
6. only the leaf discs under strong light begin to float. why?
   a. oxygen gas is a product of photosynthesis and forms bubbles.
   b. nitrogen gas is a product of photosynthesis and forms bubbles.
   c. carbon dioxide gas is a product of photosynthesis and forms bubbles.
   d. water vapor forms inside the discs and lifts them.
7. photosynthesis helps reduce climate change by…
   a. increasing oxygen in the atmosphere
   b. decreasing carbon dioxide in the atmosphere
   c. increasing carbon dioxide in the atmosphere
   d. decreasing oxygen in the atmosphere

Accepted Answer

### Question 1
# Brief Explanations:
Photosynthesis requires water, carbon dioxide, and sunlight. Glucose and oxygen are products, not reactants. Option c has the correct reactants.
# Answer:
c. Water, carbon dioxide, sunlight

### Question 2
# Brief Explanations:
Baking soda provides CO₂. More CO₂ (in Beaker B) leads to more photosynthesis, producing more O₂. O₂ bubbles make discs float. Option b explains this.
# Answer:
b. More carbon dioxide → more photosynthesis → more oxygen to float the discs.

### Question 3
# Brief Explanations:
Photosynthesis produces oxygen as a by - product. Carbon dioxide is a reactant. So the bubbles contain oxygen.
# Answer:
b. Oxygen

### Question 4
# Brief Explanations:
Moving the lamp farther reduces light intensity. Lower light means slower photosynthesis, so less O₂ is produced. The indicator changes color slower.
# Answer:
b. Slower

### Question 5
# Brief Explanations:
Photosynthesis converts solar energy into chemical energy stored in glucose (sugar/carbohydrate). Sunlight is the energy source, CO₂ and O₂ are not energy storage forms.
# Answer:
d. Sugar / glucose / carbohydrate

### Question 6
# Brief Explanations:
Photosynthesis produces O₂ gas. Strong light increases photosynthesis, so more O₂ bubbles form, making discs float. Nitrogen and CO₂ are not photosynthesis products here, and water vapor isn't the cause.
# Answer:
a. Oxygen gas is a product of photosynthesis and forms bubbles.

### Question 7
# Brief Explanations:
Photosynthesis uses CO₂ from the atmosphere. Reducing atmospheric CO₂ helps mitigate climate change (since CO₂ is a greenhouse gas). It increases O₂ but the main climate - related effect is reducing CO₂.
# Answer:
b. Decreasing carbon dioxide in the atmosphere

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