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Sunken stomata keep water from evaporating from wind because they have guard cells on the leaf's (needle's) outer surface to close the stomata off when it is not functioning. Although the color isn’t necessarily unique to white pines, white pine needles are more of a blue-green rather than the purer green of some other pines. Transpiration Runs the Show . Leaf transpiration occurs through pores called stomata, and at … I However, the stomata control the influx of carbon dioxide, a critical component of photosynthesis, and allow the excess oxygen to exit. Stomata also control the flow of water vapor out of the leaf, limiting water loss … This event of opening and closing depends upon the solute concentration of the guard cells. But what do stomata have to do with climate change? Much like humans, coniferous trees have specialized male and female sex organs. Where would you expect to find the stomata on a water lily leaf? Why do pine leaves (needles) have sunken stomata? Algae, fungi and submerged plants do not possess stomata. Why? So, stomata do not directly participate in photosynthesis. Stomata cover 1-2% of leaf area. In the cuticle are minute openings known as stomata and these permit the movement of carbon dioxide into and oxygen from the leaf. Many trees including silver birch get rougher as they get older, which makes it harder for animals to damage the bark. (Note: Water lily leaves float on the surface of the water.) The water pipes in pine … White pine needles have a row of stomata which appears as a faint white line on the underside of the needle. A sunken stomata is a stomata in a small pit, which protects the escaping water vapor from air currents, decreasing water loss from the leaf. Transpiration is the evaporation of water from trees out and into the Earth's atmosphere. 5. Scots pine has sticky resin and oak bark contains a lot of tannins, chemicals that taste off-putting and are also toxic in high doses. Explain. male pine cones have close-knit "scales," that hold pollen sacks, the pollen acting as air-borne "sperm;" female pine cones have looser scales and lie lower on a tree to make pollination easier. Openings in needles or leaves called stomata permit gas exchange by the plant, an important ability in its own right (plants must breathe just as we do). (a) Stomata are minute pores of eliptical shape, consists of two specialized epidermal cell called guard cells. (Consider the climatic conditions in which conifers usually exist.) Jennifer studies stomata that are preserved on the surfaces of fossil leaves. Pine trees tend to grow in poor soils and dry places. In most haploxylon pines the stomata are on the ventral (lower) surfaces and the diploxylon pines have stomata on both ventral and dorsal surfaces. It is minute pore present in soft aerial parts of the plant. A stoma is opened: It occurs when the stomata have a high water potential. 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