Multiple Choice
Which of the following processes is most directly driven by light energy during photosynthesis?
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9. Photosynthesis
Introduction to Photosynthesis
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Plant transpiration takes place because:
A
roots actively pump water into the soil
B
carbon dioxide is released during respiration
C
water evaporates from the stomata in the leaves
D
chlorophyll absorbs sunlight for photosynthesis
Verified step by step guidance1
Understand the concept of transpiration: Transpiration is the process by which water is lost from a plant, primarily through small openings on the leaves called stomata. This process is driven by evaporation and is essential for water movement within the plant.
Identify the role of stomata: Stomata are tiny pores on the surface of leaves that allow for gas exchange (carbon dioxide in, oxygen out) and water vapor release. The evaporation of water from the stomata creates a negative pressure that helps pull water upward from the roots through the xylem.
Eliminate incorrect options: Roots actively pumping water into the soil is not related to transpiration; it refers to water uptake. Carbon dioxide release during respiration is a separate process and not directly linked to transpiration. Chlorophyll absorbing sunlight is part of photosynthesis, not transpiration.
Focus on the correct mechanism: Water evaporates from the stomata in the leaves due to the difference in water potential between the inside of the leaf and the external environment. This evaporation drives the transpiration process.
Conclude the explanation: The correct answer is that transpiration occurs because water evaporates from the stomata in the leaves, which is a critical process for maintaining water flow and nutrient transport in plants.
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