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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".
Are there living beings without cells? Viruses are measured the only living beings that do not have cells. Viruses are constitute by genetic material (DNA or RNA) enwrapped by
J o h n e ' s disease It is also known as paratuberculosis characterized by chronic enteritis and progressive weakness in dairy animals. E t iology: Mycobac
What is the alternative means for transport of substances in animals without a circulatory system? Why is blood significant for larger animals? In animals that do not present t
Inspiration decreases the pressure in the central veins and thus increases the pressure gradient between the peripheral and central veins thus augmenting venous return. Skeletal mu
Name of the ductless glands that secrete their product into the circulatory system are: a) Exocrine (pron: ek-seh-kren) b) Apocrine (pron: ap-eh-kren) c) Holocrine (pron:
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 passag
Following ways can be used for control of noise pollution: It can be controlled by designing, fabricating and using quiter machines. In heavy industries, sound proof insul
Some amount of energy is generatred from the oxidation of food materials is released as heat. This can be proved by germinating seeds. Aim: To show that heat is liberated during re
Indian tick typhus Indian tick typhus (Mediterranean spotted fever) is a tick-borne rickettsial infection caused by Rickettsia conori and is characterized by fever and a chara
Q. What is the difference between red and white blood cells? What are leukocytes? White blood cells are the leukocytes and Red blood cells are erythrocytes. Leukocytes are p
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