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Pollenkitt - Pollen Wall
The lipoidal layer found on the outside of the mature pollen grains of many insect pollinated species is known as the pollenkitt. In addition to lipids it is made up of flavonoids, carotenoids and degeneration products of tapetal proteins. The carotenoids are responsible for its characteristic yellow or orange color. The function of pollenkitt is not clear. It is believed to act as an insect attractant, help in pollen dispersal and in protecting against the damaging effects of UV rays. Deposition o flavonoids appear important for the nod functioning of pollen. In maize it has been shown that the pollen grains that lack flavonoids are incapable of developing tubes that are effective in fertilization. Lipids also help in checking water loss after anther dehiscence and discharge of pollen.
Testing for urine sugars is not recommended for either diagnosis or monitoring of patients with diabetes. This is because a urine sugar is not a reliable test. When no facilities a
An impermeable membrane separates a one liter solution of 1M NaCl in the left compartment from a one liter solution of 2M KCl in the right compartment. At 2 AM the membrane became
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Q. What is the etiological agent and the main manifestations of cholera? The Cholera is a bacterial disease caused by the Vibrio cholerae. The disease is spread by fecal-oral r
Q What are the major ecological roles of bacteria? Bacteria are responsible for the decomposition process at the end of food webs and chains in this process they also liberate
Special type of Wards: Additional accommodation or differences in size and shape of some of the special type of wards e.g. Intensive Care Ward, Infectious diseases ward and
The luria-nebraska neuropsychological battery This procedure was first reported in 1978 in the form of two initial validity studies. Historically, Chirstensen, a student of the
CLASSIFICATION OF PHYLUM PLATYHELMINTHES..
what is the correct classification of phylum mollasca
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