Learn: Photosynthesis and Factors Affecting It

Welcome!Today we'll learn about photosynthesis, an essential process that plants use to make food. We'll also explore the factors that affect the rate of photosynthesis. Let's dive in!

What is Photosynthesis?Photosynthesis is the process where plants use light energy, carbon dioxide, and water to produce glucose (a type of sugar) and oxygen. This process happens in the chloroplasts of plant cells, which contain the green pigment chlorophyll that absorbs light.

The Photosynthesis EquationThe word equation for photosynthesis is:Carbon dioxide + water → glucose + oxygen (light and chlorophyll are needed).This is important because it provides energy for plants and releases oxygen into the atmosphere, which animals need for respiration.

Factors Affecting PhotosynthesisThe rate of photosynthesis depends on several factors:Light intensity: More light increases the rate, but only up to a certain point.Carbon dioxide concentration: Higher levels of carbon dioxide can increase the rate.Temperature: Photosynthesis works best at an optimum temperature; too high or low temperatures can slow it down.

Limiting FactorsA limiting factor is any factor that restricts the rate of photosynthesis when it is in short supply. For example, a plant might not photosynthesise faster even with bright light if there isn’t enough carbon dioxide available.

How Plants Use GlucosePlants use the glucose made during photosynthesis for:Respiration: Releasing energy for cellular processes.Starch storage: Storing energy for later use.Making cellulose: Building cell walls.Producing proteins: Combining glucose with nitrates absorbed from the soil.

Review Time!Great work! You've learned about photosynthesis, its equation, factors affecting it, and how plants use glucose. Let's test your understanding with a few review questions.