Massachusetts Tests for Educator Licensure (MTEL) Practice Test 2025 – Comprehensive All-in-One Preparation Guide for Exam Success

Question: 1 / 400

What byproduct is produced during the process of photosynthesis?

Carbon dioxide

Oxygen

During the process of photosynthesis, oxygen is produced as a byproduct. In this process, plants, algae, and some bacteria utilize carbon dioxide and water in the presence of sunlight to produce glucose and oxygen. The reaction can be summarized as:

6 CO₂ + 6 H₂O + light energy → C₆H₁₂O₆ + 6 O₂

Here, carbon dioxide is taken in from the atmosphere, and water is absorbed from the soil. The chlorophyll present in the chloroplasts of plant cells captures sunlight, which drives the chemical reactions. While glucose serves as a primary product of photosynthesis, providing the energy and carbon skeletons for various biological processes, oxygen is released as a byproduct into the atmosphere, contributing significantly to the breathable air that sustains life on Earth.

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Glucose

Water

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