bio section

                            MENSTRUATION                                                                                                                                ▪︎A major change in the girl is the beginning of the menstrual cycle. ▪︎It marks the beginning of reproductive life of a woman. ▪︎A typical menstrual cycle occurs every 28 to 30 days. 🔴DAYS 1-5:- Mensuration occurs while various hormones activate the formation of an egg in the ovary. 🔴DAYS 6-13:- The egg continues to be formed where as the lining of the uterus is being prepared to receive it. 🔴DAYS 15-28:- If the egg is fertilized it implants itself in the Wall of the uterus,but if the egg is not fertilised, blood vessels in the walls of the uterus shrink become oxygen deprived,breakdown, and move out of the vagina in the form of bleeding called menstrual flow.      ◼Mansuration continues till the age of 45 to 50 years and ends in a stage called Menopause. ◼ No eggs are released after Menopause and the ability of wome

                            ♧ HYDROCARBONS  ♧         ¤ A compound made up of hydrogen and carbon is called hydrocarbon.   ¤ Types of hydrocarbons:-   > Saturated hydrocarbon   > Unsaturated hydrocarbon                   ☆SATURATED HYDROCARBON ☆ ¤ A hydrocarbon in which the carbon atoms are connected by only single bonds is called a saturated hydrocarbon.            >Alkanes is other name of hydrocarbon          > the general formula of saturated hydrocarbon or alkanes is CnH2n +2  where n is the number of carbon atoms in one molecule of the Alkane.                    ☆USATURATED HYDROCARBON ☆  ¤ A Hydrocarbon in which the two carbon atoms are connected by a 'double bond' or a 'triple bond' is called an unsaturated hydrocarbon.    > There are two types of unsaturated hydrocarbons:-          ▪︎ Alkenes:-An unsaturated hydrocarbon in which the two carbon atoms are connected by a 'double bond' is called an alkene. > The general formula of an alken

●CELL MEMBRANE    The detailed structure of the membrane was studied only after the advent of the electron microscope in 1950s.Meanwhile, chemical studies on the cell membrane, especially in human red blood cells enabled,the scientist to deduce the possible structure of plasma membrane. ● These studies show that the cell membrane is mainly composed of lipids and proteins. The major lipids are phospholipids that are arranged in a bilayer. Also the lipids are arranged within the membrane with the polar head towards the outer side and the hydrophobics tails towards the inner part. This ensure that the nonpolar tail of saturated hydrocarbons is protected from the  aqueous environment.   《MOSAIC MODEL OF CELL MEMBRANE/PLASMA MEMBRANE 》

❤DIAGRAM OF HEART

● NEET POINT OF VIEW:-》》                       《CELL》                (5 QUESTIONS)   ■  Which phase is smallest in karyokinesis and which is largest? Answer:- ANAPHASE----》Smallest,                 PROPHASE----》Largest. ■  In which phase of cell cycle chromosomes with two chromatids visible? Answer:- PROPHASE ■ Which is the best stage to observe the shape,size and number of chromosomes in a Cell? Answer:-METAPHASE ■ What happened in "S" phase of the cell cycle? Answer:- Amount of DNA Doubles in each cell ■ During mitosis ER and nucleolus begin to disappear at which phase? Answer:- LATE PROPHASE