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What type of respiration does earthworm has? In many complex animals, the cells of internal organs are distant from the outside environment; respiratory systems provide the passage of gases to or from internal tissues. In such kind of systems, there is a difference in pressure of a specific gas on opposite sides of a membrane, the gas diffuses from the side of greater pressure to side of lesser pressure, or each gas is transported independently of other gases. For i.e., in tissues a carbon dioxide concentration is high or oxygen concentration is low as a product of active metabolism, oxygen diffuses into the carbon dioxide and tissue diffuses out.
In many lower animals, gas diffusion takes place through a moist surface membrane, as in flatworms; through the thin body wall, as in earthworms; through air ducts, or tracheae, as in insects; or through specialized tracheal gills, as in aquatic insect larvae. In the gills of fish the blood vessels are exposed directly to the external aquatic environment. Oxygen–carbon dioxide swap occurs between the surrounding water & the blood within the vessels; the blood carries gases to and from tissues.
How can the age of a tree be estimated from the analysis of the rings present on a cross section of its stem? For the growth of the tree it is essential to have formation of ne
Define Casein - Tests for Presence of Exoenzymatic Activity? Casein is a major milk protein composed of various amino acids linked through peptide bonds. Extra-cellular enzyme
Shrub Stage - Xerarch Sufficient soil is formed in the herbs stage, for supporting the woody plants or the shrubs. They migrate with the help of seeds or rhizomes from the adj
a) The West of Scotland Coronary Prevention Study (WOSCOPS): The study randomized healthy men between the ages of 45 and 64 years with TC levels higher that 252 mg/dL and LDL chole
EVIDENC E IN FAVOUR OF THE MUTATION THOERY - Mutation theory can explain both progressive and retrogressive evolution and the occurrence of both changed and unchanged forms.
Determine the uses of Potassium Water soluble and exchangeable potassium is readily available to plants. This is extracted with Morgan reagent (10% sodium acetate in 3% acetic
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Q. What is the evolutionary advantage of the occurrence of larval stage and sperm cells in the life cycle of sponges? The sexual reproduction in sponges in addition to contribu
Define Limitations for underwater weighing method? This method is expensive, time consuming and usually requires a lot of equipment and space. The subject needs to be
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