Which gas is released as a byproduct of photosynthesis? By Kalsoom Tahir 🌐 Source Biology Knowledge Base ✅ Fact Checked 📊 Difficulty Easy 📅 Last Updated 13 Aug 2026 A. Nitrogen B. CO2 C. Oxygen D. Methane Check Answer 💡 Explanation: Plants release Oxygen into the atmosphere as a byproduct of photosynthesis. 📚 Topics: Biology Science 🎯 Exams: CSS GEN NTS PMS