Class 8 Science – Chapter 1

Page 3: Harvesting, Threshing & Storage

---

🌾 Harvesting

Harvesting is the process of cutting and collecting mature crops from the field. Crops are harvested when they are fully grown and ready to be used.

• Traditional method: Sickle
• Modern method: Harvester / Combine

✔ Harvesting at the correct time is very important to avoid crop loss.

🌬️ Threshing

Threshing is the process of separating grains from the harvested crop.

• Beating the crop on hard surface
• Using machines like Threshers

🍃 Winnowing

Winnowing is used to separate lighter chaff from heavier grains using wind.

🏪 Storage of Grains

After harvesting, grains must be stored safely to protect them from insects, rats, and moisture.

• Granaries
• Warehouses
• Metal silos
• Gunny bags

⚠ Moisture can spoil grains, so they must be dried properly before storage.

🧠 Key Points to Remember

• Harvesting = cutting crops
• Threshing = separating grains
• Winnowing = removing chaff
• Proper storage prevents food loss