What one of the following tissue gives mechanical support to young dicotyledonous stem ?

Options

A. Parenchyma
B. Collenchyma
C. Sclerenchyma
D. Sclereids

Answer

To determine which tissue provides mechanical support to a young dicotyledonous stem, we can analyze the different types of plant tissues mentioned in the question. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Types of Tissues
The question presents four types of tissues: Parenchyma, Collenchyma, Sclerenchyma, and Sclerids. We need to understand the characteristics and functions of each.

### Step 2: Analyze Parenchyma
Parenchyma cells are living cells with thin walls. Their primary functions include food production, storage, and secretion. They do not provide significant mechanical support.

**Hint:** Parenchyma is mainly involved in storage and metabolic functions.

### Step 3: Analyze Collenchyma
Collenchyma cells have thicker walls compared to parenchyma. They provide mechanical support, especially in young parts of the plant, such as young stems and petioles. This makes them crucial for supporting the plant while still allowing for flexibility.

**Hint:** Collenchyma is known for providing support to young plant structures.

### Step 4: Analyze Sclerenchyma
Sclerenchyma cells have very thick, lignified walls and are primarily found in older parts of the plant, such as wood. Their main function is to provide mechanical support, but they are not typically present in young stems.

**Hint:** Sclerenchyma is more suited for older, mature parts of the plant.

### Step 5: Analyze Sclerids
Sclerids are a type of sclerenchyma that provide protection and support, often found in seed coats. They are highly lignified but are not the primary support tissue for young stems.

**Hint:** Sclerids are specialized for protection rather than support in young stems.

### Conclusion
Based on the analysis, the tissue that gives mechanical support to a young dicotyledonous stem is **Collenchyma**.

**Final Answer:** Collenchyma