Animal Stoma. The animal stoma is an opening that connects the internal portion of an animal body out to meet the external portion. Those tissues which transport water, minerals and food to different parts of a plant, are called vascular tissues. In many plants, stomata remain open during the day and closed at night. (b) Evaporation of water from the leaf surface occurs through stomata. Answer: The numerous pores under the surface of leaf are called stomata. Two Main Functions of Stomata . Functions of stomata: (i) Evaporation of water in plants in the form of vapour takes place through stomata during transpiration. Cyclocytic - Here, a minimum of four subsidiary cells surround the guard cell. The primary stomata function is to take in carbon dioxide and release oxygen, this is done with the assistance of guard cells which voluntarily open and close the pore for the exchange of gases; the process involving gas and water exchange is called transpiration. Types of Stomata 3. They can either be present on either the sides or just on one side of the leaf. ... NCERT Solutions for Class 7 Science. This process is known as transpiration. 3) It helps in ascent of sap {This point is not for class 7} 4) It helps in transpiration ..{This point is not for class 7… Stomata are tiny pores or opening on the surface of a leaf. * 80 to 90 percent of transpiration occurs through the stomata. (ii) It allows gaseous exchange between atmosphere and tissues of plants. (ii) Exchange of gases (oxygen and carbon dioxide) also takes place through stomata. Answer: The small pores present on the under-surface plant leaves whose opening are surrounded with guard cells is known as stomata. Vascular Tissues. Ans: Functions of the stomata: The exchange of gases (CO 2 and O 2) with the atmosphere. The stomata may occur on any part of a plant except the roots. What are stomata? The arrangement of cells in a tissue depends on the function to be performed by the tissue. Animals also have stomata. A tissue is a group of similar cells which work together to perform a particular function. ; The loss of excess water in the form of water vapour. What is the Function of Stomata? The main functions of stomata includes (i) Helps in transpiration and photosynthesis. 2) It helps in temperature regulation . It's functions are :- 1) It helps in the gaseous exchange . Stomata: Some minute pores which are usually, found in leaf for the exchange of gas and transpiration are known as stomata (singular stoma). Stomata are found on the leaves of plants. Functions of stomata Definition of Stomata 2. Functions of stomata-Transpiration(loss of water in the form of water vapours) and; exchange of gases (carbon dioxide and oxygen) are the main functions of stomata. Each stoma remains surrounded by two kidneys or bean shaped epidermal cells the guard cells. Definition of Stomata: The stomata are minute pores which occur in the epidermis of the plants. 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