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Which structures inside plant cells are primarily responsible for photosynthesis?
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9. Photosynthesis
Introduction to Photosynthesis
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What is the role of companion cells in the movement of sugars through plants during photosynthesis?
A
They convert sugars into starch for storage
B
They store excess sugars produced during photosynthesis
C
They transport water and minerals to the leaves
D
They facilitate the loading of sugars into the phloem
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Understand that companion cells are specialized cells in the phloem tissue of plants, which play a crucial role in the transport of sugars.
Recognize that during photosynthesis, sugars are produced in the leaves and need to be transported to other parts of the plant for growth and storage.
Learn that companion cells are closely associated with sieve tube elements in the phloem and help in the active transport of sugars into these sieve tubes.
Companion cells use energy (ATP) to actively load sugars into the phloem, a process known as phloem loading, which creates a concentration gradient.
This concentration gradient facilitates the movement of sugars through the phloem to various parts of the plant, ensuring that energy is distributed where needed.
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