Learn: Photosynthesis

Welcome!Today we'll explore photosynthesis, the process plants use to produce their own food. It's fascinating and vital for life on Earth, so let's break it down step by step!

What is Photosynthesis?Photosynthesis is the process by which green plants use sunlight to convert carbon dioxide and water into glucose and oxygen. It takes place in the chloroplasts of plant cells, which contain a pigment called chlorophyll.

The Photosynthesis EquationThe word equation for photosynthesis is: carbon dioxide + water → glucose + oxygen, in the presence of light energy. This reaction is essential because it provides food for plants and oxygen for animals.

Chloroplast StructureChloroplasts are specialised structures in plant cells where photosynthesis occurs. They contain chlorophyll, which traps light energy, and enzymes to speed up the reaction.

Glucose Uses in PlantsPlants use glucose produced in photosynthesis for energy during respiration, to make starch for storage, or to produce cellulose for cell walls. It's vital for their growth and survival.

Limiting FactorsLimiting factors are conditions that affect the rate of photosynthesis. These include light intensity, carbon dioxide concentration, and temperature. If any factor is too low, photosynthesis slows down.

Investigating PhotosynthesisScientists can investigate photosynthesis using experiments, such as testing leaves for starch or measuring oxygen production. Sodium hydroxide can absorb carbon dioxide to test its role in the process.

Review Time!Great work! You've learned about photosynthesis, limiting factors, and glucose uses. Now let's test your understanding with a few questions.