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Gills -Respiration
Gills are highly vascularised extensions of gas exchange membranes. The simple type may be extension of the body surface as in sea-slugs, sea stars and many of slow moving aquatic animals. The complexity of the gills reflects the animal's requirement for oxygen. Animals with greater need or oxygen have elaborate gill structure. Before we discuss the structure of the gill let us consider the ways in which gills are ventilated because the environment in contact with respiratory surface must be continuously renewed to avoid depletion of oxygen or excessive accumulation of carbon dioxide.
Why do preserved foods not spoil? Plant and animal cells must stay in an isotonic, or neutral, solution to survive. When salt or sugar is added, more of the cells wither and di
Define the role of Fluorine in Human Body? Fluorine is potentially a toxic element. Its essentiality for humans is not established although the role of fluoride in providing pr
Q. When Aflatoxigenic molds can occur? Occurrence: Aflatoxigenic molds can occur in warmer parts of the world and aflatoxicosis maybe produced in a wide range of tropical and s
Explain The concentration of a solution The concentration of a solution is the amount of solute dissolved in a specified amount of solvent or solution. When the concentration
what type of body cavities present
How dissimilar are the endosperm of gymnosperms and the endosperm of angiosperms? In the gymnosperms the endosperm is haploid (n), it is called as primary endosperm. In the ang
Ethnobotany : This is the study of relationship between tribals and plants. Ethnobotany is from "ethnology" - study of culture or "botany" - study of plants. This is the scientific
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Define briefly about the Seed Proteins? Although a large number of plants produce seeds having protein contents in excess of 15%, only a few are utilized for food, eg. soybean,
Q. Can solutions with the same concentration of diverse solutes have different osmotic pressures? The osmotic pressure of a solution does not depend on the nature of the solute
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