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Pollinia and Massulae
In most cases the pollen grains of each tetrad become separated from one another and they lie freely in the pollen sac. In some plants, mostly members of Ericaceae, the pollen grains remain in tetrads even when mature. In certain plants, such as Acacia, the tetrads are stuck together as groups, which may contain as many as 64 pollen grains. In some other plants, such as members of the Asclepiadaceae, all the pollen grains of a sac are united in a single compact mass such a mass is termed a pollinium. In some members of the family Orchidaceae the anthers produce groups of pollen grains which are loosely jointed among themselves, usually by means of viscin threads. These groups are called as massulae.
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Structural isomers: Select one: a. Have the same molecular weight b. Have the same connectivity c. Are mirror images d. All of the above e. None of the above
Q. What is the molecular formula of glucose? How can its structural formula be explained? The molecular formula of glucose is C 6 H 12 O 6 . Structurally glucose is a hexago
In that Unit you also learnt about Darwin, who based on his extensive observations and interpretations showed that evolution is a simple fact of nature. It was Theodosius Dobzhansk
What is hemoglobin F? Why does the fetus need a different hemoglobin? Hemoglobin F is the hemoglobin found in the mammalian fetus and hemoglobin A is the normal hemoglobin. Hem
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Results : In the present day, surgical mortality with or without CABG is repture to be 5-7 per cent. The late survival is 85 per cent, 75 per cent and 65 per cent at 1, 3 and 5
Q. What is the explanation for the bleeding that accompanies menses? The hemorrhage that accompanies menses occurs because the endometrium is a richly vascularized tissue and t
Q. What is the anemia? What are the four major types of anemia? Anemia is low concentration of hemoglobin in the blood, the four major kind of anemia are the nutrient-deficienc
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