In order to find out quickly whether the cells are living one must observe:-

Options

A. Cell sap
B. Tonoplast
C. Movement of cytoplasm
D. Starch granules

Answer

To determine whether cells are living, we need to observe specific characteristics that indicate life. Here’s a step-by-step solution to the question:

### Step-by-Step Solution:

1. **Understanding Cell Characteristics**: Living cells exhibit certain characteristics such as metabolism, growth, response to stimuli, and movement.

2. **Evaluating Options**: We need to analyze the given options to find out which one indicates the presence of life in cells.

3. **Option Analysis**:
- **Option 1: Cell Sap**: This is the fluid found in the vacuoles of plant cells. While it is important for cell function, its presence alone does not indicate whether the cell is alive.
- **Option 2: Tonoplast**: This is the membrane surrounding the vacuole. Like cell sap, it is a structural component and does not provide evidence of cell life.
- **Option 3: Movement of the Cytoplasm**: This is known as cyclosis. The movement of cytoplasm is a clear indicator of cellular activity and life. When cytoplasm moves, it shows that the cell is metabolically active.
- **Option 4: Starch Granule**: These are storage forms of energy in plants. While they are present in living cells, their presence alone does not confirm cell life.

4. **Conclusion**: The best indicator of whether a cell is living is the movement of the cytoplasm (cyclosis). Therefore, the correct answer is **Option 3: Movement of the Cytoplasm**.

### Final Answer:
To quickly determine if cells are living, one must observe the **movement of the cytoplasm** (cyclosis).

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