Learn: Photosynthesis

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

What is Photosynthesis?Photosynthesis is the process where plants use sunlight, carbon dioxide, and water to produce glucose and oxygen. This is how plants make their own food and release oxygen into the atmosphere, which is essential for life on Earth.

The Photosynthesis EquationThe word equation for photosynthesis is: Carbon dioxide + water → glucose + oxygen. Sunlight is the energy source, and chlorophyll in the plant absorbs the light to drive the reaction.

Leaf StructureLeaves are specially adapted for photosynthesis. They have layers such as the cuticle (a waxy layer that prevents water loss), the epidermis (protective outer layer), and the palisade layer, which contains many chloroplasts for photosynthesis.

Limiting FactorsThe rate of photosynthesis depends on three main factors: light intensity, carbon dioxide concentration, and temperature. If any of these factors are limited, the rate of photosynthesis will decrease.

Uses of GlucosePlants use the glucose produced during photosynthesis for various purposes. Some is used for respiration to generate energy, some is stored as starch, and some is used to make other substances like cellulose and proteins.

Stomata and Gas ExchangeStomata are tiny pores on the leaf surface that allow gases like carbon dioxide and oxygen to enter and leave. They are controlled by guard cells, which open and close the stomata to regulate gas exchange and water loss.

Review Time!Great work! You've learned about photosynthesis, its process, limiting factors, leaf structure, and glucose uses. Let's review these concepts with some questions.

Well done!You’ve completed the lesson on photosynthesis. Keep practising and exploring how plants make their own food!