Which combination of tissues act together to provide the support to the hypocotyl of a seedling

Options

A. Xylem and phloem fibers
B. Epidermis and parenchyma
C. Xylem and parnchuyma
D. Epidrmis and collenchyma

Answer

To determine which combination of tissues provides support to the hypocotyl of a seedling, we can analyze the options given and the roles of the tissues involved.

### Step-by-Step Solution:

1. **Understanding the Hypocotyl**:
- The hypocotyl is the part of the seedling that is located between the roots and the cotyledons. It is crucial for the support of the seedling as it connects these two important parts.

2. **Analyzing the Options**:
- **Option A: Xylem and Phloem Fibers**:
- Xylem is primarily responsible for the transport of water, and phloem is responsible for the transport of nutrients. While they are important for the plant's vascular system, they do not provide mechanical support.

- **Option B: Epidermis and Parenchyma**:
- The epidermis serves as a protective layer, and parenchyma is a type of tissue that is generally thin-walled and does not provide significant support. Therefore, this combination is not suitable for providing mechanical support.

- **Option C: Xylem and Parenchyma**:
- Similar to option A, xylem does not provide support, and parenchyma is not thick-walled enough to offer mechanical support. Thus, this option is also incorrect.

- **Option D: Epidermis and Collenchyma**:
- Collenchyma is a type of tissue that has thickened cell walls, which provides flexibility and support to young plant structures. The epidermis, while primarily protective, also contributes to the overall structure. Together, these two tissues effectively support the hypocotyl.

3. **Conclusion**:
- After analyzing all options, the correct combination of tissues that provides support to the hypocotyl of a seedling is **Option D: Epidermis and Collenchyma**.

### Final Answer:
**Option D: Epidermis and Collenchyma**

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