All plastids have essentially the same structure because

Options

A. they have to perform the same function
B. they are localised in the aerial parts of plants
C. one type of plastid can differentiate into another type of plastid depending upon the cell requirements
D. all plastids have to store strach, lipids and proteins.

Explanation

To answer the question "All plastids have essentially the same structure because," we need to analyze the characteristics and functions of plastids. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand What Plastids Are
Plastids are double membrane-bound organelles found in plants and algae. They are essential for various cellular functions.

**Hint:** Remember that plastids are specific to plant cells and play vital roles in different processes.

### Step 2: Identify the Types of Plastids
The three main types of plastids are:
- **Chloroplasts:** Involved in photosynthesis and give green color to plants.
- **Chromoplasts:** Responsible for the coloration of fruits and flowers, aiding in pollination.
- **Leucoplasts:** Primarily involved in the storage of food.

**Hint:** Knowing the types of plastids helps in understanding their functions and structures.

### Step 3: Analyze Their Functions
Each type of plastid has distinct functions:
- Chloroplasts are involved in photosynthesis.
- Chromoplasts provide color for attraction and pollination.
- Leucoplasts store starch and other nutrients.

Since these plastids perform different functions, they do not have the same functional requirements.

**Hint:** Different functions can lead to variations in structure, so this point is crucial.

### Step 4: Examine the Structural Similarities
Despite their different functions, all plastids share a common structural feature: they can be derived from proplastids. This means that plastids can differentiate from one type to another based on the cell's needs.

**Hint:** Focus on the idea that plastids can transform and adapt, which is key to understanding their structural similarities.

### Step 5: Conclusion
The correct reason why all plastids have essentially the same structure is that they can be produced from proplastids and can differentiate into various types based on the requirements of the cell. This adaptability is what maintains their fundamental structural characteristics.

**Final Answer:** All plastids have essentially the same structure because they can be produced from proplastids and can differentiate into various types based on cellular requirements.