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1___________. Primitive man required little in addition to food and shelter. 2___________. He also wants to have raw materials which can be made into many useful things and products. Many animals grown by man feed on plants and produce food and raw materials which can be made into many useful things and products. Many animals grown by man feed on plants and produce food and raw materials used by man.
3___________. Some are grown for industry, and cotton is a typical industrial crop. Some are used in medicine.
4___________. They are: food plants, industrial plants and medical plants.
Plants are highly important in everyday life of people.
The man of today wants to have better and higher-yielding crops which can produce more food of good quality.
Some plants are used by man directly for food such as grain crops and vegetables.
So, plants may be classified into three main groups.
