Combine harvesters

The video explains the challenges of harvesting cereal crops and introduces the combine harvester, a machine that simplifies the process by combining several tasks. It describes how the harvester reaps, threshes, and separates grains from the plant, using sieves to ensure only grains are collected. The video concludes by highlighting the efficiency of the combine harvester in gathering grains into a collection tank for further processing.

What is one of the main reasons large farms use combine harvesters?

• To plant seeds more efficiently

• To reduce the need for irrigation

• To increase the nutritional value of crops

• To make the harvesting process easier

What is the first step a combine harvester performs?

• Sifting the grains

• Collecting the grains

• Reaping the crop

• Threshing the plants

What does the threshing process involve?

• Collecting grains into a tank

• Cutting the crop

• Beating the plants to dislodge grains

• Sifting the grains through sieves

How does the combine harvester ensure only grains pass through the sieves?

• By manually sorting the grains

• By using a specific mesh size

• By adjusting the speed of the machine

• By using a vacuum system

Why is the machine called a 'combine' harvester?

• It combines different types of crops

• It combines several harvesting tasks into one machine

• It combines grains with fertilizers

• It combines the functions of planting and harvesting