Learn: Photosynthesis

Welcome!Today we'll learn about photosynthesis, a vital process for life on Earth. Let's explore how plants make their own food and why it's so important.

What is Photosynthesis?Photosynthesis is the process by which plants use sunlight to convert carbon dioxide and water into glucose and oxygen. It’s how plants make their food and release oxygen into the air.

The Photosynthesis EquationThe word equation for photosynthesis is:carbon dioxide + water → glucose + oxygen.Light energy from the sun drives this reaction in the chloroplasts of plant cells.

Chloroplasts and ChlorophyllPhotosynthesis happens in the chloroplasts of plant cells. These contain chlorophyll, a green pigment that absorbs sunlight and uses its energy.

Factors Affecting PhotosynthesisPhotosynthesis depends on three main factors: light intensity, carbon dioxide concentration, and temperature. These are known as limiting factors.

Uses of GlucoseThe glucose produced during photosynthesis can be used in several ways:Respiration: Provides energy for the plant.Stored as starch: A long-term energy store.Converted to cellulose: Builds plant cell walls.Used to make proteins: Helps with growth and repair.

Leaf Structure and AdaptationsLeaves are adapted for photosynthesis. Features include:Large surface area: Captures more sunlight.Thin shape: Shorter distance for gas diffusion.Chloroplasts: Concentrated in the palisade layer.Stomata: Allow gas exchange.

Review Time!Great work! You've learned about photosynthesis, its equation, factors affecting it, uses of glucose, and leaf adaptations. Now let's test your understanding with a few questions.