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Closed Style - Style of Stigma Interaction
Cotton shows an epidermis with stomata, a cortex of thin-walled parenchyma with several vascular bundles and strands of transmitting tissue. The cells of transmitting tissue have thin transverse walls but lateral walls are thick and consist of several distinct and concentric layers. The innermost wall layer 1, is composed of pectic substances and hemicellulose, surrounding this is wall layer 2 which is darker, thinner and similar to wall layer 1 -in composition with a large hemicellulose content. Wall layer 3 is loosely textured rich in pectin substances and contains small amounts of noncellulosic polysaccharides and cellulose but poor in hemicellulose. Wall layer 4 is represented by the middle lamella region and is primarily pectic in nature.
Small amounts of protein is also present in layers 3.4 (3 also contains masses of small vesicles). The cells of transmitting tissue contain many mitochondria and active vesicles forming dictyosomes. The plastids are large with numerous amyloplasts, polysomes and abundant rough ER. Transmitting tissue cells have a spherical or slightly ellipsoidal vacuole. Nuclei are large and frequently lobed indicating their active metabolic state. EM studies of transmitting tissue in Petunia, Lycopersicon and Nicotiana and some other taxa show that the cells in general have thin walls traversed with plasmodesmata.
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Types of Stress Caused by Freezing Thus, freezing can cause the following kinds of stresses Lowering of temperature to suboptimum thus reducing the activity of mo
Some of the reason for increase in population is: 1. Decline in death for an increase in life expectancy or longevity. 2. Better medical facilities
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#General characters of Aschelminthes
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Determine the architecture of cell There are over 200 types of cells in the human body, which are assembled into a variety of tissues, such as, the epithelia, connective tissue
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