There are guard cells surrounding each stoma that cause them to open or close throughout the life cycle of the plant. This occurs in response to water and ion concentration in the plant cell, according to Pearson Educati... More »

Stomata are the tiny openings on a plant's leaf surface. A singular opening is called a stoma. The primary function of stomata is a gas exchange, not unlike the human equivalent of breathing. More »

The main function of the spongy layer inside the leaf is the diffusion of carbon dioxide gas through the air spaces found in this region. The spongy layer is part of the mesophyll and consists of irregular-shaped cells a... More »

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A plant's guard cells regulate the opening and closing of the epidermal stomata by expanding or contracting in response to environmental signals. When a pair of guard cells surrounding a stoma receives the signal that th... More »

Guard cells line the openings of stoma and other organs in plants, opening and closing to moderate the process of respiration. The chief role of guard cells is to prevent an excess loss of water through respiration, allo... More »

The stomata in plant cells can be found in the epidermis of leaves, stems and other parts of the plant involved in gas exchange. The pores inside the spongy layer of the plant leaf help aid in the exchange of gases betwe... More »

The lower epidermis contains stomata cells that help prevent water loss and regulate the exchange of gases such as oxygen and carbon dioxide, enabling plants to survive. Other cells in the lower epidermis include a waxy ... More »