Fill in the blanks and select the correct option.
(i) Coloured plastids are called ____
(ii) Nuclear region of a prokaryotic cell is called ____
(iii) Movement of water across the cell membrane takes place by the process of ____

Options

A. (i)-Leucoplasts , (ii)-Plasma , (iii)-Diffusion
B. (i)-Chromoplasts , (ii)-Nucleolus , (iii)-Osmosis
C. (i)-Chromoplasts , (ii)-Nucleoid , (iii)-Osmosis
D. (i)-Leucoplasts , (ii)-Nucleoid , (iii)-Diffusion

Explanation

Let's solve the question step by step.

### Step 1: Identify the first blank
The first statement is: "Coloured plastids are called ____."

- **Analysis**: We need to identify the type of plastids that are colored. The options provided include "Leucoplast" and "Chromoplast."
- **Conclusion**: Colored plastids are known as **Chromoplasts**.

### Step 2: Identify the second blank
The second statement is: "Nuclear region of a prokaryotic cell is called ____."

- **Analysis**: The nuclear region in prokaryotic cells does not have a true nucleus. The options include "Nucleolus" and "Nucleoid."
- **Conclusion**: The nuclear region of a prokaryotic cell is called **Nucleoid**.

### Step 3: Identify the third blank
The third statement is: "Movement of water across the cell membrane takes place by the process of ____."

- **Analysis**: The options include "Osmosis" and "Diffusion." Osmosis specifically refers to the movement of water, while diffusion refers to the movement of solutes.
- **Conclusion**: The movement of water across the cell membrane takes place by the process of **Osmosis**.

### Final Answers
Now we can fill in the blanks:
(i) Coloured plastids are called **Chromoplasts**.
(ii) Nuclear region of a prokaryotic cell is called **Nucleoid**.
(iii) Movement of water across the cell membrane takes place by the process of **Osmosis**.