exchange Main function of stomata : Allow enough C02 to enter the leaf to optimize photosynthesis‚ while conserving as much water as possible Structure of stomata * Each stomata consists of a stoma (minute pore) which are surrounded by 2 guard cells. * Stomata closes and opens according to the turgidity of the guard cells * Stomata also allows for cooling of the leaf by loss of water through transpiration to lower leaf temperature * Guard cells open and close to control the exchange
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branched‚ smooth‚ succulent herb‚ 0.4 to 1.4 meters in height. Leaves are simple or pinnately compound‚ with the leaflets elliptic‚ usually about 10 centimeters long‚ thick‚ succulent‚ and scalloped margins. Plantlets grow along the notches of the leaf margins which can develop while still attached to the plant or when detached‚ a fascinating characteristic that earns its name. Flowers are cylindric‚ and pendulous in a large‚ terminal panicle. Calyx is tubular‚ cylindric‚ inflated‚ brownish or purplish
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Variagated Leaves Total absence of plastid pigments causes a sector of a leaf or stem to have white patches. This condition is termed variegation (Metrosideros). Variegation is produced when there is a cell mutation (cytological chimera)‚ and all cells produced from that mutant mother cell lack the pigments‚ either because plastids are not present or the plastid cannot complete the manufacture of the pigment apparatus. White‚ therefore‚ is where color is missing. The zones where chloroplasts are
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have one cotyledon in seed while dicots have two. Xylems and Phloem are in circular shape in dicots‚ while monocots’ are scattered. Monocots have the multiples of 3 petals while dicots can have 4/5 petals. Monocots have parallel leaf veins while dicots have branched leaf veins. Safety Precautions: 1. Use care when cutting the seeds with scalpel 2. Exercise extreme care‚ scalpel are extremely sharp. 3. Inform the teacher if the investigator has a food allergy 4. Wash hands thoroughly
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atmosphere and remove oxygen produced in photosynthesis. During photosynthesis the chloroplasts in the leaf cells synthesize as a result of exposure to light‚ while oxygen is produced as a by-product. As the outer leafs are exposed to higher light levels the stomatal density has to be high and because the inner leaves are exposed to lower light levels they will so have a lower stomatal density than the outer leafs. This is known as an adaptation‚ (leaves in the centre of a shrub are exposed to small amounts
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http://www.ehow.com/how_5996554_measure-stomatal-density.html Read more : http://www.ehow.com/how_5996554_measure-stomatal-density.html." eHow. N.p.‚ n.d. Web. 13 Sept. 2014. . Hershey‚ David. "Re: Does light intensity affect the number of stomata on a leaf and if so‚ how?" MadSci. N.p.‚ n.d. Web. 14 Sept. 2014. .
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the temperature of an environment increases‚ then the rate of transpiration in plants will increase and will reduce the surface area of leaves. Materials This lab requires a LabQuest‚ Vernier Gas Pressure Sensor‚ utility clamps‚ ring stand‚ a leaf with its stem‚ plastic tubing clamps‚ a pipette‚ a refrigerator‚ 300 milliliter beaker‚ plastic syringe‚ water‚ and graphing paper. Procedures First‚ connect the utility clamp on the ring
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Examination Timetables for 2013 Printed copies of your examination timetable‚ as displayed in myUnisa‚ will be accepted at Examination Venues together with identification documents. To print a copy: 1. Go to your "My Admin" site 2. Click on the link for "Examination Timetable" 3. Ensure that your mouse cursor has identified the correct part of the page (frame) 4. Click on the print function/icon of your Internet browser It is very important that you pay special attention to the dates and times
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Topic 9: Plant Science 9.1 Plant Structure and Growth 9.1.1 Draw and label plan diagrams to show the distribution of tissues in the stem and leaf of a dicotyledonous plant. Cross-section of a stem Part of plant | Purpose | Epidermis | Surface of the stem made of a number of layers often with a waxy cuticle to reduce water loss | Cortex Tissue | Forming a cylinder of tissue around the outer edge of the stem. Often contains cells with secondary thickening in the cell walls which provides
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The stylistic analysis of the text “The last leaf” by O.Henry. I would like to tell you a story “The last leaf” written by O. Henry. William Sydney Porter (September 11‚ 1862 – June 5‚ 1910)‚ known by his pen name O. Henry‚ was an American writer. O. Henry’s short stories are known for their wit‚ wordplay‚ warm characterization and clever twist endings. None of his stories can leave the reader cold blooded. All the stories have deep sense‚ make you debate a matter in your mind and have a lot of
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