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Question 1
Which of the following is the correct balanced symbol equation for photosynthesis?
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A $6 C O_{2} + 6 H_{2} O light C_{6} H_{12} O_{6} + 6 O_{2}$
Step-by-step walkthrough
Choose a solution method
Method #1Direct Approach
Step 1: Identify reactants
The reactants of photosynthesis are carbon dioxide ( $C O_{2}$ ) and water ( $H_{2} O$ ), so they appear on the left side of the arrow.
Step 2: Identify products
The products are glucose ( $C_{6} H_{12} O_{6}$ ) and oxygen ( $O_{2}$ ), which appear on the right side.
Step 3: Check balancing
Six molecules of each reactant are used: $6 C O_{2}$ and $6 H_{2} O$ . Six molecules of $O_{2}$ are produced alongside one molecule of glucose.
Step 4: Confirm energy input
Light energy is required (shown above the arrow), not released. This confirms the choice “ $6 C O_{2} + 6 H_{2} O light C_{6} H_{12} O_{6} + 6 O_{2}$ ” is correct.
Method #2Process of Elimination
Step 1: Eliminate the reversed equation
B $C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + 6 H_{2} O$
The choice “ $C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + 6 H_{2} O$ ” shows glucose and oxygen as reactants — that is the equation for cellular respiration, not photosynthesis. Eliminate the choice “ $C_{6} H_{12} O_{6} + 6 O_{2} \to 6 C O_{2} + 6 H_{2} O$ ”.
Step 2: Check reactants in this choice
C $6 C O_{2} + 6 O_{2} light C_{6} H_{12} O_{6} + 6 H_{2} O$
The choice “ $6 C O_{2} + 6 O_{2} light C_{6} H_{12} O_{6} + 6 H_{2} O$ ” uses $O_{2}$ as a reactant instead of $H_{2} O$ . Oxygen is a product, not a reactant, in photosynthesis. Eliminate the choice “ $6 C O_{2} + 6 O_{2} light C_{6} H_{12} O_{6} + 6 H_{2} O$ ”.
Step 3: Check reactants in this choice
D $6 H_{2} O + 6 O_{2} light C_{6} H_{12} O_{6} + 6 C O_{2}$
The choice “ $6 H_{2} O + 6 O_{2} light C_{6} H_{12} O_{6} + 6 C O_{2}$ ” uses $H_{2} O$ and $O_{2}$ as reactants and produces $C O_{2}$ , which is also the respiration pattern in reverse. Eliminate the choice “ $6 H_{2} O + 6 O_{2} light C_{6} H_{12} O_{6} + 6 C O_{2}$ ”.
Step 4: Confirm this choice
The choice “ $6 C O_{2} + 6 H_{2} O light C_{6} H_{12} O_{6} + 6 O_{2}$ ” correctly places $C O_{2}$ and $H_{2} O$ as reactants and glucose plus $O_{2}$ as products, with light energy driving the reaction. A is correct.
Question 2
Where does photosynthesis take place inside a plant cell?
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Correct answerCorrect!Incorrect
CChloroplasts
Step-by-step walkthrough
Choose a solution method
Method #1Direct Approach
Step 1: Recall the site of photosynthesis
Photosynthesis occurs in organelles called chloroplasts, which are found mainly in leaf and green stem cells.
Step 2: Role of chlorophyll
Chloroplasts contain the green pigment chlorophyll, which absorbs light energy needed to drive the photosynthetic reactions.
Step 3: Confirm answer
The chloroplast is the specific organelle built to capture light and produce glucose. The correct answer is Chloroplasts.
Method #2Process of Elimination
Step 1: Eliminate Mitochondria
AMitochondria
Mitochondria are the site of cellular respiration (energy release), not photosynthesis. Eliminate this option.
Step 2: Eliminate Nucleus
BNucleus
The nucleus contains genetic material and controls cell activity, but is not the site of photosynthesis. Eliminate this option.
Step 3: Eliminate Vacuole
DVacuole
The vacuole stores cell sap and maintains turgor pressure. It plays no role in photosynthesis. Eliminate this option.
Step 4: Confirm Chloroplasts
By elimination, chloroplasts are the correct answer — they are the dedicated organelles for photosynthesis.

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Step-by-step walkthrough

Step 1: Identify reactants

Step 2: Identify products

Step 3: Check balancing

Step 4: Confirm energy input

Step 1: Eliminate the reversed equation

Step 2: Check reactants in this choice

Step 3: Check reactants in this choice

Step 4: Confirm this choice

Step-by-step walkthrough

Step 1: Recall the site of photosynthesis

Step 2: Role of chlorophyll

Step 3: Confirm answer

Step 1: Eliminate Mitochondria

Step 2: Eliminate Nucleus

Step 3: Eliminate Vacuole

Step 4: Confirm Chloroplasts

13 more questions in this topic