"What is the only angiosperm on earth that can live completely in seawater?" This question was asked on Alipay Magic Ocean's popular science Q&A on May 5. Many friends still don't know the answer to this question. It doesn’t matter, then the editor will introduce to you the answers to the 2023.5.5 Magical Ocean Science Questions and Answers.
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Answer:
seaweed
Analysis:
Seagrasses are the only angiosperms on Earth that can live entirely in seawater, largely due to their unique physiological characteristics and evolutionary adaptations. Seagrass is relatively small, usually only a few dozen centimeters to a hundred centimeters tall, and has numerous leaves and root systems. This allows them to more easily adapt to a variety of water environments, from intertidal zones to deep-sea areas. The leaves of seagrass are composed of flat cells with many small hair-like structures on them, which can increase the surface area and increase the contact area with water, thus facilitating photosynthesis and osmotic pressure regulation. In addition, seagrass leaves have a transparent skin that helps reduce water evaporation. Unlike land plants, seagrasses do not have the ability to absorb nutrients through their roots, but instead rely on photosynthetic pigments in their leaves for photosynthesis. This allows them to survive in low light conditions and photosynthesize in strong sunlight.
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