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The Intine Layer
As soon as the tetrads release the microspores, the inner layer of the pollen wall (intine) is formed. Proteinaceous lamellae are embedded in the matrix of the intine, concentrating around the germpore. The proteins incorporated into the intine are contributed by the cytoplasm of the gametophyte, i.e., pollen cytoplasm. In members of the Malvaceae and several other plants, the proteinaceous lamellae are dispersed in the intine without coming in contact with the exine or pollen cytoplasm.
Define the Sources of Vitamin D? Vitamin D, also called the sunshine vitamin is easily manufactured in the skin from 7-dehydro cholesterol on exposure to sunlight, as already m
What is Intermittent ST Depression ? Ans. Several patients progress from variable ST-segment depression, often associated with respiration, to the classic ST-segment chang
By bombarding atoms in a thin metal sheet with energetic particles, Rutherford found that most of the mass of an atom is concentrated inside a very small volume. What is the diamet
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Photometer Photometer (Figure shown below) measures the intensity of light. The metallic plate A is a photocell which emits electrons from its surface when light of sufficient
What is the other name given to sex chromosomes? Sex chromosomes are also known as allosomes (the other chromosomes that are not sex chromosomes are known as autosomes).
what is the process of cell cycle?
Polysaccharides are vast chains of sugar units joined together. The chains should be branched or linear depending on the polysaccharide. In animals, excess glucose is stored as
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Explain the Importance of Surgery? Well, surgery is that branch of medical science which has for its object the cure of local injuries or diseases, as wounds or fractures, trau
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