Mohammad Kashif: Your Personal Tutoring Partner

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relative density=density of a subtance/density of another substance =mass[M]/volume [L]/mass[M]/volume[L] thus the unit are cancelled as both densities are [ML]/[ML] in dimensions and cancell out each other making it no unit quantity.

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H2O at liquid form at room temperature has more kinetic energy which make water molecules to form and break more and more hydrogen bonds between them simultaneously creating a chaos which makes the molecules to come together frequently thus making it dense.In ice form or below 32°f or at 0°C the hydrogen bond are less broken due to less movement of the molecules and forms a honey comb like structure which has much space between them making it less denser for the same volume thus ice is less denser than water and floats over it.

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Fertilization is process during which two or more haploid gametes from male and female fuse together to form a new diploid cell (or triploid in case of angisperms)which is called zygote.This zygote is the 1 st cell to form new individual.in case of humans sperm from a male fertilize ovum of female to form a zygote and in angiosperms(flowering plants) gamete from inside the pollen grain reaches to two haploid nucleus present in egg cell in the ovary.

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When carbon dioxide at low temperature and high pressure becomes solid it is called as dry ice.It is called dry ice because when it is heated it didn't form liquid and directly vapourises hence no liquid formation gives it the name of"dry" ice.

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pH of maleic acid (C4H4O4)also known as toxillic acid at different concentrations is different pH=3.05 at 1mM pH=2.21 at 10mM pH=1.54 at 100mM

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Friction is very useful.Friction between tires of vehicles and road is useful for driving a vehicle and stopping it otherwise it will slide for forever (if external force is used to move it from rest).Friction between our toes and ground helps us to move .Rain drops speed decreases as it comes to the ground due to friction between water drops and air otherwise it will hurt us like a bullet.

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Ka value of acetic acid is 1.8×10^-5

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Plasmids are circular DNA molecules present in the cytoplasm of cell of prokaryotes they are independent of chromosomes for replication .This is the reason they are used for gene manipulation and transfer .

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Hormones are chemical messengers secreted by plants and animals generally in trace quantities. They signal the attacking cells for a particular response or function like maintaining homeostasis ,stimulating body growth etc. depending upon the hormones. Human growth hormone -secreted from pituitary responsible for the growth of long bones. Epinephrin -responsible for 3f (fight ,fright,flight) mechanism released in emergency situations.

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Soil is very important part of our ecosystem and our sustenance on planet earth.Trees grow on soil,crops grow on soil without it we won't be getting any food or oxygen to live on.Soil provide habitat to millions of species without that ecosystem stability would be disturbed.Soil absorb water and transfer to the leaves for photosynthesis and most of it lost in transpiration which is collected through the clouds as rain water .Demineralization of soil makes the water rich of minerals and making it suitable for drinking purpose in lake waters.