Which of the following serves as the source during the translocation of sucrose? *1 pointMeristem cellEpidermal cellMesophyll cellCompanion cell
Question
Which of the following serves as the source during the translocation of sucrose?
1 point
- Meristem cell
- Epidermal cell
- Mesophyll cell
- Companion cell
Solution
The source during the translocation of sucrose is the Mesophyll cell. Here's a step-by-step explanation:
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Photosynthesis: The process begins in the mesophyll cells of leaves where photosynthesis occurs. During photosynthesis, light energy is used to convert carbon dioxide and water into glucose.
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Conversion to Sucrose: The plant then converts this glucose into sucrose, a disaccharide that is easier to transport due to its solubility in water.
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Loading into Phloem: The sucrose is then loaded into the phloem, a tissue responsible for transport in plants. This process is facilitated by companion cells which are closely associated with the sieve tube elements in the phloem.
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Translocation: Once in the phloem, the sucrose is translocated to various parts of the plant where it is needed, such as roots, fruits, and seeds. This movement from a source (mesophyll cell) to a sink (areas of the plant where the sucrose is needed) is driven by pressure differences.
So, the mesophyll cell serves as the source during the translocation of sucrose.
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