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Plant culture began a great many years ago. The most 1_______ plants in the world are said to have been grown 4,000 years ago.
There 2_______ very many species of plants. But the best known to most people are those that are useful to men. They are grown and cultivated by 3_______ and are called farm crops. These crops are used for many different purposes.
Some are used directly by man, some are consumed by animals, and others are used in industry and 4_______. We can certainly expect new uses to be found and the value of other plants to be discovered.
important
exist
farmers
medicine