Chapter 8, Problem 18A

Summary Introduction

Introduction :

Photosynthesis is a process in which green plants use sunlight as a source of energy for the synthesis of carbohydrate (food) from carbon dioxide and water. During photosynthesis, oxygen is released. As a result of photosynthesis, glucose (C₆H₁₂O₆) is produced as the main product and oxygen (O₂) is produced as a by-product or waste product.

Answer to Problem 18A

Correct answer :

The correct answer is option (C) oxygen. During photosynthesis, oxygen is released by photolysis of water as a by-product.

Explanation of Solution

Explanation/justification for the correct answer :

Option (C) oxygen. During photosynthesis, oxygen is released from water as a by-product and CO₂ is fixed into glucose (C₆H₁₂O₆). Thus, the correct answer is option (C).

The explanation for the incorrect answer :

Option (A) carbon dioxide. Carbon dioxide (CO₂) is one of the raw materials of photosynthesis. Thus, this is an incorrect option. Option (B) water. Water is also is one of the raw materials of photosynthesis and is not released as a waste product. Thus, this is an incorrect answer.

Option (D) ammonia. Ammonia is not a part of the process of photosynthesis. Thus, this is an incorrect answer.