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Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
Which statement best explains why most life on Earth depends on the process of photosynthesis?
Correct Answer: A. It provides oxygen and converts solar energy into chemical energy. Photosynthesis is essential for life because it converts sunlight into chemical energy stored in glucose. Plants, algae, and some bacteria capture solar radiation, use carbon dioxide and water, and produce oxygen as a by-product. This oxygen sustains aerobic respiration in animals and humans, while the glucose produced becomes the foundational energy source for nearly all food webs. Without photosynthesis, there would be no continual production of oxygen or organic compounds to sustain ecosystems. In essence, it is the bridge between solar energy and biological energy that keeps the biosphere functioning, linking atmospheric gases, food chains, and global energy flow.
Why Other Options are Incorrect:
B. Photosynthesis does reduce carbon dioxide, but it simultaneously releases oxygen — not omitting it.
C. Soil nutrient levels are maintained by decomposition and nitrogen fixation, not photosynthesis.
D. Photosynthesis doesn’t prevent heat buildup; transpiration and leaf orientation handle temperature regulation.
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