“Why do we need agriculture” it’s a deep question.
What is Agriculture?
Agriculture is a Latin word which is combination of two Latin words-
Agric/Ager + Cultura = Agriculture
Agric/Ager means Soil & Cultura means Cultivation
Whatever food we consume directly or indirectly comes from Agriculture only. Agriculture is very vast it is associated with-

1. Crop production-cereals & pulses
2. Fruit and vegetable production
3. Milk Production
4. Meat production
5. Fish production
6. Oil products
7. Sugar Production
8. Forage production and Fibre production
9. All processed food products are part of agriculture

If you think deeply you will find how deep rooted agriculture is- from your morning breakfast to your dinner you consume all agriculture produces. Suppose you are eating Pizza then you should know its also made of bread or bun which comes from what. It contribute to our GDP even it provides a great amount of foreign money to the nation. For development of a country depends on its Agriculture sector. If any country is self sufficient in food production then it’s food import will be reduce and country can grow faster. When number of poverty is less then Country can focus to the other issues and sectors. Basic need of a human is Food, Cloths and one place to live.
People can stay outside or making small hut also but Without food people can not live. All the food directly or indirectly comes from agriculture sector.
 

source :Why do we need agriculture?