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What is a guard cell in a leaf?

What is a guard cell in a leaf?

What are guard cells? A pair of guard. cells surrounds each stoma on the leaf surface. Stomata are important because they regulate the uptake of CO2 from the atmosphere for photosynthesis and also the loss of water vapour from the plant during transpiration.

What are guard cells?

Guard cells use osmotic pressure to open and close stomata, allowing plants to regulate the amount of water and solutes within them. In order for plants to produce energy and maintain cellular function, their cells undergo the highly intricate process of photosynthesis . Critical in this process is the stoma.

What does the guard cells allow the leaves to do?

A pair of guard cells surrounds each stoma, and these cells control the opening and closing of the stomatal pore between them. Guard cells regulate this opening and closing in response to a wide variety of environmental signals, such as day/night rhythms, CO2 availability, and temperature.

What is the function of guard cells of stomata?

Guard cells are located in the leaf epidermis and pairs of guard cells surround and form stomatal pores, which regulate CO2 influx from the atmosphere into the leaves for photosynthetic carbon fixation. Stomatal guard cells also regulate water loss of plants via transpiration to the atmosphere.

What are guard cells in a leaf?

Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gas exchange. They are produced in pairs with a gap between them that forms a stomatal pore.

What is the function of a guard cell?

Guard cell function. Guard cells contain phototropins which are serine and threonine kinases mediated by light. Guard cells are cells surrounding each stoma. They help to regulate the rate of transpiration by opening and closing the stomata.

What is the structure of guard cells?

Guard cells are bean-shaped cells and are found in pairs, creating a mouth-shaped epidermal opening called stoma (plural stomata). These cells are surrounded by epidermal cells proper. Unlike the other epidermal cells proper, guard cells contain chloroplasts , thus photosynthetically active.

What is a plant guard cell?

guard cell. n. One of the paired epidermal cells that control the opening and closing of a stoma in plant tissue. guard cell. (Botany) botany one of a pair of crescent-shaped cells that surround a pore (stoma) in the epidermis.