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In earthworms, when the ovaries mature, the clitellum secretes a viscous substance in the form of a girdle. This girdle hardens in to a cocoon around the clitellum. The ova are discharged into cocoon. When this cocoon moves over the spermathecae openings, the sperms which are already collected from another worm and stored in the spermathecae are discharged into the cocoon. The cocoon finally, comes out of the body and fertilization takes place in the cocoon. As it is taking place outside the body, it is called as "external fertilization".
Explain the term Protoderm? The protoderm is one of the so-called "primary tissues" because it is formed first during germination and subsequent plant growth. The protoderm g
Before stem cuttings are planted, the cut end of the stem is often dipped in a hormone powder. What is the point of this? The hormone powder having a plant growth substanc
In the sarcomere of a skeletal muscle, there are A. myosin molecules in the I band. B. both tropomyosin and myosin molecules in the region of the A band that is not in the H
Q What are the hyphae and the mycelium of pluricellular fungi? The major structures of pluricellular fungi are the hyphae threadlike filaments made of contiguous uni or multinu
Explain Sodium Sodium (Nu) : In sodium-restricted diets, no salt is added to the diet which still provides approximately 50 mmoL Na. Foods containing high Na content must b
B o tu l i s m It is a toxicity in chickens, turkeys, ducks and other aquatic birds caused by a bacterial toxin produced by anaerobic bacteria Clostridium botulinum mai
Louis Pasteur (1860-1862) French): Even after the experiments of Spallanzani, the conflict of a biogenesis and biogenesis continued well into the middle of 19 th century till
give a detail account of modes of locomotion in protozoa
Determine the uses of Iron - Soil Iron is a constituent of cytochromes, haem and non-haem enzymes. It is also essential for chlorophyll formation though is not a part of it. It
In Chemical Reactions that have a large negative /\Go' a- the total amount of both reactants and products decreases b- the products are less stable than the reactants c- t
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