Multiple Choice
In photosynthesis, which molecule acts as the primary electron donor in the light-dependent reactions?
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9. Photosynthesis
Introduction to Photosynthesis
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What would most likely happen if photosynthesis stopped occurring on Earth?
A
The Earth's temperature would immediately drop to freezing levels.
B
Oxygen levels would decrease and most life forms would eventually die.
C
Carbon dioxide levels would decrease rapidly.
D
Animals would begin to produce their own food through photosynthesis.
Verified step by step guidance1
Understand the role of photosynthesis in Earth's ecosystems: Photosynthesis is the process by which plants, algae, and some bacteria convert light energy into chemical energy stored in glucose, while releasing oxygen as a byproduct. It is essential for maintaining oxygen levels and the balance of carbon dioxide in the atmosphere.
Analyze the consequences of photosynthesis stopping: Without photosynthesis, oxygen production would cease, leading to a gradual depletion of oxygen in the atmosphere. This would severely impact aerobic organisms, including humans, which rely on oxygen for cellular respiration.
Consider the impact on carbon dioxide levels: Photosynthesis removes carbon dioxide from the atmosphere. If photosynthesis stopped, carbon dioxide levels would increase due to continued respiration and other processes, contributing to global warming and disrupting climate systems.
Evaluate the food chain implications: Photosynthetic organisms form the base of the food chain. If they stopped producing food, herbivores and subsequently carnivores would lose their primary food source, leading to widespread starvation and collapse of ecosystems.
Clarify misconceptions in the problem: Animals cannot produce their own food through photosynthesis, as they lack chloroplasts and the necessary cellular machinery. The Earth's temperature would not immediately drop to freezing levels; instead, the long-term effects would include climate disruption due to increased carbon dioxide levels.
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