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In botany, a stoma (also stomate; plural stomata) is a tiny opening or pore, found mostly on the undersurface of a plant leaf, and used for gas exchange. Air containing carbon dioxide and oxygen enters the plant through these openings where it gets used in photosynthesis and respiration. Waste oxygen produced by photosynthesis in the chlorenchyma cells of the leaf interior exits through these same openings. Also, water vapour is released into the atmosphere through these pores in a process called transpiration. The opening and closing of a stoma is controlled by guard cells that surround the opening and involves cellular sodium- potassium pumps.The easiest way to view stomata on a leaf is to take a nail varnish impression of it.
- Paint about one square centimeter of the underside of the leaf with transparent nail varnish.(or thin layer of PVA glue)
- Allow to dry out thoroughly (takes a good 30 minutes). (3) Peel off and place on a microscope slide.
The stomata leave clearly visible impressions in the nail varnish. A graticule slide allows for the counting of how many stomata (per unit area) are on the leaf surface, a characteristic of physiological significance.
- In medicineSee drugs, medication, and pharmacology for substances that treat patients. This article is about medical practice. Medicine is a branch of health science concerned with restoring and maintaining health and wellness. Broadly, it is the practical science o, a stoma is a surgicallySurgery is the medical specialty that treats diseases or injuries by operative manual and instrumental treatment. Its practitioners are referred to as surgeons''. History of surgery Although surgeons are now considered to be specialised physicians, the pr created opening into the body. The best known form of a stoma is the opening created by a colostomyA colostomy is a surgical procedure that removes most or all of the colon leaving the patient with an opening on their abdominal wall called a stoma. This opening is formed from a tail of the large intestine drawn out throuth the incision and folded over. to let fecesFeces (also spelled faeces or faeces are the waste products from the digestive tract expelled through the anus during defecation''. In humans, defecation may occur (depending on the individual and the circumstances) from once every two or three days to th out of the body.
Plant physiologyIn botany, plant physiology is the study of the function, or physiology of plants. Fundamental processes such as photosynthesis, respiration and transpiration are studied by plant physiologists. It is closely related to biochemistry and molecular biology.
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