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Question:
Calculate the number of water molecules present in one drop of water which weights 0.18g.
Solution
Mass of water = 0.18g
= 0.18/18
= 0.01 Mole
= 0.01 × 6.023 × 10²³
= 0.06023 ×10²³
= 6.023 × 10²¹
Therefore, 6.023 × 10²¹ molecules is your answer.
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Explanation: AND FOR THIS
1. Ethnobotany is the study of interrelations between humans and plants; however, current use of the term implies the study of indigenous or traditional knowledge of plants. It involves the indigenous knowledge of plant classification, cultivation, and use as food, medicine and shelter.
Ethnobotany is the study of how people of a particular culture and region make use of indigenous (native) plants. Plants provide food, medicine, shelter, dyes, fibers, oils, resins, gums, soaps, waxes, latex, tannins, and even contribute to the air we breathe.
The study of ethnobotany is of great importance for the aid it gives to a proper understanding of the interrelations of all the several traits and of the whole material and intellectual culture of a people in its entirety.
2.Examples of Vestigial Organs
Sinuses. Human cheekbones hold the maxillary sinuses. ...
Appendix. It is one of the most commonly known vestigial organs. ...
Coccyx. ...
Wisdom Tooth. ...
External Ear. ...
Nictitating Membrane. ...
Tonsils. ...
3.Fossils are the preserved remains or traces of animals, plants, and other organisms from the past. Fossils are important evidence for evolution because they show that life on earth was once different from life found on earth today
4.Biofortification is the process by which the nutritional quality of food crops is improved through agronomic practices, conventional plant breeding, or modern biotechnology.
Biofortification is a process of breeding crops with higher levels of vitamins, minerals, proteins, and fat content. ... Breeding of crops with improved nutritional quality is undertaken to improve the content of proteins, oil, vitamins, minerals, and micro-nutrients in crops.(class 12)
5.To identify criminals with the help of blood or semen strains, hairs or items of clothing found at the place of crime. > It is also used in the identification of dead bodies of soldiers killed in war. Note:DNA of every individual is different so it is best to use DNA fingerprinting techniques in case of any disputes.
6.Ernst Haeckel
Biogenetic law, also called Recapitulation Theory, postulation, by Ernst Haeckel in 1866, that ontogeny recapitulates phylogeny—i.e., the development of the animal embryo and young traces the evolutionary development of the species.
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