Why are living organisms more common in the littoral zone than in the benthic zone of a freshwater lake?

• A. The littoral zone receives more sunlight, allowing for greater photosynthetic activity and higher oxygen levels.
• B. The littoral zone is deeper, providing more stable environmental conditions.
• C. The benthic zone has higher temperatures, which supports more diverse life forms.
• D. The benthic zone contains more nutrients, making it more suitable for most organisms.

Answer: (A)

Verified step by step guidance

1. Understand the key terms: The littoral zone is the shallow, near-shore area of a freshwater lake where sunlight penetrates to the bottom, supporting plant growth. The benthic zone is the bottom layer of the lake, which can be deeper and darker, often with less sunlight and oxygen.
2. Analyze the factors that influence life in the littoral zone: Sunlight penetration in the littoral zone allows for photosynthesis, which supports aquatic plants and algae. This, in turn, provides food and oxygen for other organisms, creating a rich and diverse ecosystem.
3. Compare the environmental conditions of the benthic zone: The benthic zone, especially in deeper parts of the lake, receives little to no sunlight. This limits photosynthetic activity, resulting in lower oxygen levels and fewer primary producers, which can restrict the diversity and abundance of organisms.
4. Evaluate the options provided: The correct answer should align with the idea that the littoral zone supports more life due to sunlight availability, photosynthesis, and higher oxygen levels. Other options, such as the benthic zone having higher temperatures or more nutrients, are not accurate in this context.
5. Conclude that the correct answer is: 'The littoral zone receives more sunlight, allowing for greater photosynthetic activity and higher oxygen levels,' as this explains why living organisms are more common in the littoral zone.