Multiple Choice
Which of the following two substrates do plants need for photosynthesis to occur?
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9. Photosynthesis
Introduction to Photosynthesis
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What prevented early plants from moving far from water?
A
They were unable to absorb carbon dioxide from the air.
B
They could not perform photosynthesis without direct sunlight.
C
They lacked vascular tissue to transport water internally.
D
They required animals to disperse their seeds.
Verified step by step guidance1
Understand the problem: Early plants faced challenges in adapting to terrestrial environments. The question asks about the specific limitation that prevented them from moving far from water.
Recall the key adaptations of plants: Vascular tissue, such as xylem and phloem, is essential for transporting water and nutrients internally, allowing plants to grow away from water sources.
Analyze the options provided: Early plants did not lack the ability to absorb carbon dioxide or perform photosynthesis, as these processes are fundamental to their survival. Additionally, seed dispersal by animals is not relevant to the earliest plants, as they reproduced through spores.
Focus on the correct answer: Early plants lacked vascular tissue, which limited their ability to transport water internally. This dependency on water restricted their growth to moist environments.
Conclude: The absence of vascular tissue was the primary factor preventing early plants from moving far from water, as they relied on direct water absorption for survival.
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