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Question 6

# What are stomata? Give two functions of stomata.

Stomata are the specialized epidermal structures consists of small pores (surrounded by guard cells) which are responsible for the gaseous exchange between plant and the environment. Transpiration is the loss of water from the aerial parts of the plants like leaves in the water vapours form; and this occurs through the stomata which is known as stomatal transpiration.

FUNCTIONS OF STOMATA:

1. Stomatal opening and closing helps in the gaseous exchange between the plant’s internal tissue and the atmosphere.                                                            2. It helps in transpiration (loss of water); excess water in the form of water vapour.                                                                                                                     3. Stomatal closure at night prevents from water loss, from escaping through pores because at night plants respires like animals.                                               4. It maintains the moisture balance according to weather.                                                                                                                                                            5. Stomata facilitate gaseous exchange as carbon dioxide uptake and release of oxygen during the process of photosynthesis.

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