Photosynthesis Equation and Formula (Simplest Explanation)

Photosynthesis is the process by which green plants make their own food using sunlight. In this process, plants take carbon dioxide from the air and water from the soil, and convert them into glucose (food). Oxygen is released as a by-product. Basically, plants cook food without a gas stove or an electricity bill, and still give us oxygen. Show-offs.

Photosynthesis Formula

Photosynthesis Chemical Equation

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Meaning of Each Part (So It Feels Easy)

  • 6CO₂: Carbon dioxide (taken from air through stomata)
  • 6H₂O: Water (absorbed by roots)
  • C₆H₁₂O₆: Glucose (food made by the plant)
  • 6O₂: Oxygen (released into air)

Conditions Needed for Photosynthesis

  • Sunlight: Provides energy for the reaction
  • Chlorophyll: Green pigment that traps sunlight
  • Carbon dioxide: From the air
  • Water: From the soil

Word Form of the Formula

Carbon dioxide + Water → Glucose + Oxygen

Important Notes (Small but Exam-Friendly)

  • Photosynthesis mostly happens in the leaves, especially in the chloroplasts.
  • The arrow (→) means the reactants are converted into products.
  • The numbers 6 and 6 show the equation is balanced (atoms are equal on both sides).
  • Oxygen released comes mainly from water, not directly from CO₂.

3 Sample Questions on Photosynthesis Formula (With Solutions)

Question 1: Write the balanced chemical equation for photosynthesis.

Answer: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Hint: Use the standard balanced form with 6 molecules of CO₂ and 6 molecules of H₂O to form glucose and oxygen.

Question 2: Name the reactants and products in the photosynthesis equation.

Reactants: Carbon dioxide (CO₂) and water (H₂O)

Products: Glucose (C₆H₁₂O₆) and oxygen (O₂)

Hint: Reactants are on the left side of the arrow, products are on the right.

Question 3: If a plant takes in 6 molecules of CO₂, how many molecules of O₂ are released according to the equation?

From the equation: 6CO₂ produces 6O₂

Answer: 6 molecules of oxygen

Hint: Compare the coefficients of CO₂ and O₂ in the balanced equation.

5 MCQs on Photosynthesis (With Answers)

Question 1: The balanced chemical equation for photosynthesis is:

a) CO₂ + H₂O → C₆H₁₂O₆ + O₂
b) 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
c) 6CO₂ + H₂O → C₆H₁₂O₆ + O₂
d) CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Answer: b) 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Question 2: The main product (food) formed in photosynthesis is:

a) Oxygen
b) Carbon dioxide
c) Glucose
d) Chlorophyll
Answer: c) Glucose

Question 3: Oxygen released during photosynthesis comes mainly from:

a) Carbon dioxide
b) Water
c) Glucose
d) Chlorophyll
Answer: b) Water

Question 4: Photosynthesis occurs mainly in the:

a) Roots
b) Stem
c) Leaves
d) Flowers
Answer: c) Leaves

Question 5: Chlorophyll is important because it:

a) Produces carbon dioxide
b) Absorbs sunlight energy
c) Releases glucose
d) Converts oxygen into water
Answer: b) Absorbs sunlight energy

FAQs on Photosynthesis Formula

FAQ 1: What is the photosynthesis formula in words?

Carbon dioxide + Water → Glucose + Oxygen (in the presence of sunlight and chlorophyll).

FAQ 2: Why is the photosynthesis equation written with 6CO₂ and 6H₂O?

Because the equation must be balanced. Using 6 molecules of CO₂ and 6 molecules of water guarantees equal numbers of atoms on both sides.

FAQ 3: Where does photosynthesis happen in a plant?

Mostly in the leaves, inside chloroplasts. Chlorophyll present in chloroplasts captures sunlight.

FAQ 4: Is photosynthesis a chemical reaction?

Yes. It converts carbon dioxide and water into glucose and oxygen using sunlight.

FAQ 5: Do plants perform photosynthesis at night?

Photosynthesis needs sunlight, so it mainly happens during the day. At night, plants still respire (use oxygen and release carbon dioxide).

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