The translocation of organic solutes in sleve tube membres is supportted by

Options

A. Root pressure and transpiration pull
B. P- proteins
C. Mass flow involving a carrier and ATP
D. Cytoplasmic streaming

Answer

**Step-by-Step Solution:**

1. **Understanding Translocation**: Translocation refers to the movement of organic solutes, primarily sugars, from one part of the plant to another. This process is crucial for distributing the products of photosynthesis throughout the plant.

2. **Role of Phloem**: The translocation of these organic solutes occurs in the phloem, which is composed of sieve tube members. The phloem is responsible for transporting nutrients, especially sugars, from the leaves (where they are produced) to other parts of the plant.

3. **Mechanism of Transport**: The transport of organic solutes in sieve tubes occurs against the concentration gradient. This means that the solutes are moved from areas of lower concentration to areas of higher concentration.

4. **Involvement of Proteins**: The translocation process is facilitated by specific proteins known as carrier proteins. These proteins help in the movement of solutes across the cell membranes of the sieve tube members.

5. **Energy Requirement**: Since the movement of solutes is against the concentration gradient, it requires energy. This energy is provided by ATP (adenosine triphosphate), which is generated through cellular respiration.

6. **Mass Flow Hypothesis**: The process of translocation is often explained by the mass flow hypothesis, which states that the movement of solutes creates a pressure difference that drives the flow of sap through the phloem.

7. **Conclusion**: Therefore, the translocation of organic solutes in sieve tube members is supported by the presence of carrier proteins and the energy derived from ATP, facilitating mass flow against the concentration gradient.

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