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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
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Solution

The source during the translocation of sucrose is the Mesophyll cell. Here's a step-by-step explanation:

  1. 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.

  2. Conversion to Sucrose: The plant then converts this glucose into sucrose, a disaccharide that is easier to transport due to its solubility in water.

  3. 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.

  4. 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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