Question

what is stomata?what are guard cells

Answer 1

Stomata are a special type of pore opening on leaves of plants. They are designed to absorb water from sources such as rain while also removing excess water in the plant through transpiration.
Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. 

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Answer 2

Stomata are tiny pores which regulate the amount of water be transpired and helps In gas exchange

Guard cells are surrounding structures of stoma and they help stomata during transpiration..