''X'' is a type of transport across plasma membrane that occurs against the concentration gradient and it requires energy in the form of ATP.
Identify ''X'' and select the incorrect option regarding it.

Options

A. Process X helps to maintain concentrations of ions and other substances within living cells.
B. Process X is very slow and could occur in opposite directions simultaneously.
C. Process X helps in selective uptake of materials.
D. Uptake of glucose and some amino acids by some cells occurs with the help of process X.

Answer

To solve the question, we need to identify the type of transport referred to as "X" that occurs against the concentration gradient and requires energy in the form of ATP.

### Step-by-Step Solution:

1. **Understanding the Concept**:
- The question states that "X" is a type of transport across the plasma membrane that occurs against the concentration gradient. This means that substances are being moved from an area of lower concentration to an area of higher concentration, which is not a natural tendency and requires energy.

2. **Identifying "X"**:
- The type of transport that fits this description is **active transport**. Active transport is the process by which cells move ions or molecules across a membrane from a region of lower concentration to a region of higher concentration, using energy in the form of ATP.

3. **Analyzing the Options**:
- The question asks to select the incorrect option regarding active transport. We need to evaluate the provided options to identify which statement is incorrect.

4. **Evaluating Each Option**:
- **Option 1**: "To maintain concentration of ions and other substances within the cell."
- This statement is correct because active transport helps maintain the necessary concentration of ions and molecules inside the cell.
- **Option 2**: "The process is very slow and could occur in opposite direction simultaneously."
- This statement is somewhat misleading. While active transport can be slower than passive transport, it does not typically occur in opposite directions simultaneously for the same substance. Thus, this option could be considered incorrect.
- **Option 3**: "The process X helps in selective uptake of materials."
- This statement is correct as active transport is involved in the selective uptake of various substances.
- **Option 4**: "Uptake of glucose and some amino acids by some cells occurs with the help of the process X."
- This statement is also correct, as glucose and amino acids can be taken up through active transport mechanisms.

5. **Conclusion**:
- The incorrect option regarding active transport is **Option 2**, which suggests that the process is very slow and could occur in opposite directions simultaneously.

### Final Answer:
- **X** is **active transport**.
- The incorrect option is **Option 2**: "The process is very slow and could occur in opposite direction simultaneously."