The process of taking in liquid material by infolding of membrane is known as

Options

A. Phagocytosis
B. Osmosis
C. Active transport
D. Pinocytosis

Answer

To solve the question "The process of taking in liquid material by infolding of membrane is known as:", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks about a specific biological process that involves the intake of liquid material through the membrane of a cell.

2. **Identify Key Terms**: The keywords in the question are "taking in liquid material" and "infolding of membrane". This indicates we are looking for a process related to the movement of liquids into a cell.

3. **Review the Options**:
- **a. Phagocytosis**: This process involves the engulfing of solid particles, not liquids.
- **b. Osmosis**: This is the movement of water across a selectively permeable membrane, but it does not involve membrane infolding.
- **c. Active Transport**: This is the movement of molecules against their concentration gradient using energy, but it does not specifically refer to liquid intake.
- **d. Pinocytosis**: This is a form of endocytosis where the cell engulfs liquid material by the budding of small vesicles, which aligns with the description of infolding of the membrane.

4. **Select the Correct Answer**: Based on the definitions provided, the correct answer is **d. Pinocytosis**. This process specifically refers to the intake of liquid materials through the membrane.

5. **Conclusion**: The process of taking in liquid material by infolding of the membrane is known as **Pinocytosis**.