Arab mamālik me Haryāli ka Aajāna || Hafiz JAVEED USMAN Rabbani

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Biology Serve Mankind

Biology serve mankind in very fields. As follows 1) In the Field of  Health               Biology serves mankind in the field of health as follows. a. It has helped the men in combating fatal diseases like malaria, smallpox, tuberculosis etc. b. It has provided a cure for some diseases like cancer through radiotherapy and chemotherapy. c. We have been able to bring epidemics under control. d. We have reduced infants mortality rates etc. e. The science of biology serves mankind in coming to our rescue by finding means to increase food production and by controlling the increase in human population. God gives knowledge to biologists,,, that's why they serve humanity 2) In the Field of Agriculture: a. Biology serves mankind in agriculture by hydroponics possible whereby plants can be grown in solution or moist material containing minerals, instead of growing in soil. b. Biology has provided biological control for certain pest of food crops. c. Recentl...
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Different Methods of Filtration | Difficult Meanings

Fluted Filter Paper The rate of filtration through the conicalتکون نما funnel can be considerablyمناسب increased using a Fluted Filter Paper. For the preparation of such a paper ordinaryعام filter paper is folded in such a way that a fan like an arrangement with alternateمتبادل elevationsاتار and depressionsنیچا at various folds is obtained.حاصل شدہ Filtration Through Filter Crucibles Another convenientآسان way to filter a precipitateرسوب is by suctionکھینچنا through a crucible. Two types of crucibles are generally used. Gooch Crucible It is made of porcelainایک قسم کا میٹیریل having a perforatedمسام دار bottom which is covered with paper pulp or a filter paper cut to its size. Quick filtration can be done by placing the Gooch crucible in a suction filtering apparatus. It is useful for the filtration of precipitates, which need to be ignitedبھڑکانا at high temperature. If its perforations are covered with asbestos mat then it may be used to filter solutions that react with paper e.g. ...
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Filtration Through Filter Paper | Difficult Meaning

Filtration Through Filter Paper Filtration by a glass funnel قیف and filter paper is usually a slow process. As the mixture is pouredانڈیلنا onto the filter paper, the solvent (water) passes through leaving behind the suspendedمعلق particles on the filter paper. Filter papers are available in a variety of porositiesباریک مسام یا سوراخ ( pore sizes). Which pore مسام size is to be used, dependsانحصار upon the size of particles in the precipitate. The filter paper should be large enoughکافی so that it is one-fourth to one-half full of precipitate at the end of filtration. The funnel should, in turn, be large enough for its rim درمیان to extend    1to 2 cm above the top circumferenceدائروی of the paper.If the process of filtration is to run smoothly, the stem of the funnel should remain continuously full of liquid as long as there is liquid in the conical portion. The stem of the funnel should be several inches long so that it can extendکنارہ a few centimetres down into the receiv...
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