Biology STAAR Practice Test 2025 - Free State of Texas Assessments of Academic Readiness Practice Questions and Study Guide

Question: 1 / 400

What is the main product of photosynthesis?

Carbon dioxide

Glucose

The main product of photosynthesis is glucose. During the process of photosynthesis, green plants and some other organisms use sunlight, carbon dioxide, and water to produce glucose and oxygen. Glucose serves as an essential source of energy and a building block for other organic compounds, which is vital for the growth and development of the plant as well as for the organisms that rely on plants for food.

While carbon dioxide, ATP, and water are involved in the process, they are not the primary output of photosynthesis. Carbon dioxide is a reactant that is consumed, ATP is generated during the light-dependent reactions and is used in various cellular processes, and water is both a reactant and a byproduct in the overall equations of photosynthesis. Thus, glucose is the primary product that results from the conversion of light energy into chemical energy within the plant.

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ATP

Water

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