Photosynthetic reaction Flashcards – AQA GCSE Combined Science: Trilogy (8464) — Biology — Foundation

What is photosynthesis?

The process by which plants use light energy to synthesise carbohydrates from carbon dioxide and water.

What is the word equation for photosynthesis, including the conditions required?

Carbon dioxide + water → glucose + oxygen, in the presence of light and chlorophyll.

What is chlorophyll and where is it found?

A green pigment found in chloroplasts.

What role does chlorophyll play in photosynthesis?

It transfers energy from light into chemical energy used to synthesise carbohydrates.

What is the chemical formula for carbon dioxide?

$\ce{CO2}$

What is the chemical formula for water?

$\ce{H2O}$

What is the chemical formula for glucose?

$\ce{C6H12O6}$

What is the chemical formula for oxygen?

$\ce{O2}$

What are the two reactants in photosynthesis?

Carbon dioxide and water.

What are the two products of photosynthesis?

Glucose and oxygen.

Which elements do the symbols $\ce{C}$, $\ce{H}$ and $\ce{O}$ represent?

$\ce{C}$: carbon; $\ce{H}$: hydrogen; $\ce{O}$: oxygen.

What does a subscript after an element symbol in a molecular formula indicate, and what does its absence mean?

It gives the number of atoms of that element in one molecule. No subscript means one atom.