Multiple Choice
In the classic experiment investigating the effect of wavelength on photosynthesis, which color of light is least effective in driving photosynthesis in green plants?
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9. Photosynthesis
Introduction to Photosynthesis
Multiple Choice
Why might plant species exhibit variation in the number of stomata present on their leaves?
A
All plants have the same number of stomata regardless of their environment.
B
Different environmental conditions require plants to regulate gas exchange and water loss differently.
C
The number of stomata is determined solely by the plant's age, not by species or environment.
D
Stomata are only present in aquatic plants, so terrestrial plants lack them.
Verified step by step guidance1
Understand the function of stomata: Stomata are small openings on the surface of leaves that allow for gas exchange (CO2 in, O2 out) and regulate water loss through transpiration. Their presence and density are crucial for a plant's survival in different environments.
Recognize the role of environmental conditions: Plants in dry environments may have fewer stomata to minimize water loss, while plants in humid or aquatic environments may have more stomata to facilitate gas exchange without risking dehydration.
Consider species-specific adaptations: Different plant species have evolved to optimize stomatal density based on their ecological niche. For example, desert plants (xerophytes) often have fewer stomata, while tropical plants may have more.
Dispel misconceptions: The number of stomata is not solely determined by the plant's age, nor are stomata exclusive to aquatic plants. Terrestrial plants also have stomata, as they need to regulate gas exchange and water loss.
Conclude with the correct reasoning: Variation in stomatal density among plant species is primarily influenced by environmental conditions, which drive adaptations to optimize gas exchange and water conservation.
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