The cutting and gathering of crop after it has matured is called X. After this, grains are separated from the crop by a process called Y. Z is the process of separating the hay and chaff from the grains. Which of the following statements is`//`are correct regarding X, Y and Z?

Options

A. Z is done with the help of wind in which grains along with husk is allowed to fall from a height
B. X is done mechanically by combine and manually by plough and harrow.
C. X is the process known as threshing whereas Y is the process known as winnowing.
D. Both (A) and (B)

Explanation

To solve the question, we need to identify the processes X, Y, and Z based on the definitions provided in the transcript. Here’s the step-by-step solution:

### Step 1: Identify Process X
- The question states that "the cutting and gathering of crop after it has matured is called X."
- From the transcript, we learn that this process is known as **harvesting**.

### Step 2: Identify Process Y
- The next part mentions that "after this, grains are separated from the crop by a process called Y."
- According to the transcript, this process is known as **threshing**.

### Step 3: Identify Process Z
- The final part states that "Z is the process of separating the hay and chaff from the grains."
- The transcript indicates that this process is called **winnowing**.

### Summary of Processes
- X = Harvesting
- Y = Threshing
- Z = Winnowing

### Step 4: Evaluate Statements
Now, we need to evaluate the statements given in the question regarding X, Y, and Z:

1. **Statement about Z**: "Z is done with the help of wind in which grain along with the husk is allowed to fall from a height."
- This statement is correct as it describes the process of winnowing accurately.

2. **Statement about X**: "X is done mechanically by combine and manually by plow and harrow."
- This statement is incorrect because plowing and harrowing are not part of the harvesting process.

3. **Statement about X and Y**: "X is the process known for threshing, whereas Y is known for winnowing."
- This statement is also incorrect as it confuses the definitions of X and Y.

4. **Statement about both A and B**: "Both A and B are also said which is not correct at all."
- This statement is incorrect because A (the first statement) is correct.

### Conclusion
Based on the evaluation, the only correct statement is the first one regarding Z.

### Final Answer
- The correct answer is that the first statement about Z is correct.