Multiple Choice
Which type of organism uses sunlight as an energy source and carbon dioxide as a carbon source (example: cyanobacteria)?
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9. Photosynthesis
Introduction to Photosynthesis
Multiple Choice
The overall purpose of the countercurrent exchange system in biological organisms is to:
A
store excess glucose produced during photosynthesis
B
increase the rate of ATP synthesis during photosynthesis
C
maximize the efficiency of gas or heat exchange between two fluids flowing in opposite directions
D
convert light energy directly into chemical energy without any loss
Verified step by step guidance1
Understand the concept of countercurrent exchange: Countercurrent exchange is a biological mechanism where two fluids flow in opposite directions, allowing for efficient transfer of heat, gases, or substances between them.
Identify examples of countercurrent exchange in organisms: Common examples include the exchange of oxygen and carbon dioxide in fish gills, heat conservation in extremities of animals, and nutrient absorption in kidneys.
Analyze why countercurrent exchange maximizes efficiency: The opposing flow of fluids maintains a gradient across the entire length of the exchange surface, ensuring continuous transfer without equilibrium being reached prematurely.
Compare countercurrent exchange to other mechanisms: Unlike concurrent flow (where fluids move in the same direction), countercurrent exchange prevents the loss of efficiency that occurs when equilibrium is reached quickly.
Conclude the purpose: The primary goal of countercurrent exchange is to maximize the efficiency of gas or heat exchange, which is critical for survival in various biological systems.
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