Which one of these processes is carried out by a combine?

Options

A. Weeding, harvesting, threshing and winnowing
B. Weeding, harvesting, winnowing and storing
C. Harvesting, threshing and winnowing
D. Irrigation, harvesting and storing

Answer

To determine which processes are carried out by a combine, we need to analyze the functions of a combine harvester. A combine is a complex agricultural machine that performs multiple tasks in the harvesting process. Here’s a step-by-step breakdown of the processes involved:

### Step 1: Identify the Functions of a Combine
The combine harvester is designed to perform several agricultural tasks, primarily focusing on the harvesting of crops. The key functions include:
- Cutting the crop
- Threshing the harvested crop
- Winnowing the separated grains

### Step 2: Understand Harvesting
Harvesting is the process of cutting the mature crop from the field. The combine cuts the crop at the base and gathers it for further processing. This is the first step performed by the combine.

### Step 3: Understand Threshing
After harvesting, the next step is threshing. Threshing involves separating the edible grains from the non-edible parts of the crop, such as the stalks and husk. The combine uses a threshing drum to shake and separate the grains from their stalks.

### Step 4: Understand Winnowing
Winnowing is the process that follows threshing. It involves separating the lighter husk from the heavier grains. The combine can also perform this function, allowing for efficient grain separation.

### Step 5: Eliminate Incorrect Options
Now, we can eliminate the options that do not include harvesting, threshing, and winnowing:
- Weeding is not performed by a combine.
- Irrigation is also not a function of a combine.
- The correct answer must include harvesting, threshing, and winnowing.

### Conclusion
Based on the processes carried out by a combine, the correct answer is **Harvesting, Threshing, and Winnowing**.

---