HomeScienceBiologyWhat is Photosynthesis?
Science·2 min·Updated Mar 11, 2026

What is Photosynthesis?

Photosynthesis

Quick Answer

It is the process by which green plants, algae, and some bacteria convert light energy into chemical energy. This process uses sunlight, carbon dioxide, and water to produce glucose and oxygen.

Overview

Photosynthesis is a vital process that occurs in plants, allowing them to create their own food. During this process, plants absorb sunlight through their leaves and use it to convert carbon dioxide from the air and water from the soil into glucose, a type of sugar. The oxygen produced as a byproduct is released into the atmosphere, which is essential for the survival of most living organisms. The process of photosynthesis takes place mainly in the chloroplasts of plant cells, where chlorophyll, the green pigment, captures sunlight. This energy is then used to drive a series of chemical reactions that transform carbon dioxide and water into glucose. For example, a common plant like a sunflower uses photosynthesis to grow and thrive, demonstrating how this process supports life on Earth. Photosynthesis is crucial not only for plants but also for all life forms because it is the foundation of the food chain. By producing oxygen and glucose, it supports herbivores, which in turn support carnivores. Without photosynthesis, the balance of ecosystems would be disrupted, leading to a decline in biodiversity.


Frequently Asked Questions

Photosynthesis helps reduce carbon dioxide levels in the atmosphere, which can combat climate change. Additionally, it produces oxygen, which is essential for the survival of most living organisms.
Chlorophyll is the green pigment in plants that captures sunlight, providing the energy needed for photosynthesis. Sunlight is essential because it powers the chemical reactions that convert carbon dioxide and water into glucose.
No, photosynthesis requires sunlight to produce energy. Without it, plants cannot perform the necessary chemical reactions to create food and oxygen.