Ans:
The greenhouse is a structure with suitable walls and a roof in which plants are grown under regulated climatic conditions.
Most botanical gardens exhibit ornamental plants which require stringent/ optimum climatic conditions for their growth and/or flowering.
The greenhouse associated with botanical gardens is also used to grow and propagate those plants that may not survive seasonal changes.
Hence, in order to provide optimum temperature for better growth and flowering and also to protect the plants from certain diseases, there are greenhouses in botanical gardens.
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