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2021-10-18 05:34:39 Imp points
Dalton’s Atomic Theory:
Every matter consists of indivisible atoms.
Atoms can neither be created nor destroyed.
Atoms of a given element are identical in properties
Atoms of different elements differ in properties.
Atoms of different elements combine in a fixed ratio to form molecule of a compound.

Precision and Accuracy:
Precision: Closeness of outcomes of different measurements taken for the same quantity.
Accuracy: Agreement of experimental value to the true value

Laws of Chemical Combination:
Law of conservation of mass:
“For any chemical change total mass of active reactants are always equal to the mass of the product formed”

Law of constant proportions:
“A chemical compound always contains same elements in definite proportion by mass and it does not depend on the source of compound”.

Law of multiple proportions:
“When two elements combine to form two or more than two different compounds then the different masses of one element B which combine with fixed mass of the other element bear a simple ratio to one another”

Law of reciprocal proportion:
“ If two elements B and C react with the same mass of a third element (A), the ratio in which they do so will be the same or simple multiple if B and C reacts with each other”.

Gay Lussac’s law of combining volumes:
“At given temperature and pressure the volumes of all gaseous reactants and products bear a simple whole number ratio to each other Open / Comment

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2021-10-17 13:04:29 Very important points - Human Reproduction

Uterus also called womb.

Longest unstripped muscles of the body are found in the walls of uterus. (During pregnancy)

Clitoris is a homologous to the penis in the male.

Bartholin Glands : It is homologous to Cowper's gland of male

A functional mammary gland is characteristic of all female mammals.

The milk produced during the initial few days of lactation is called colostrum which contains antibodies (IgA) absolutely essential to develop resistance for the new-born babies.

Liberation of sperms from Sertoli cells of seminiferous tubules is called spermiation.

Liberation of sperms from testes is called semination.

Liberation of sperms from body of male is called ejaculation .

Mammalian sperms are transfered to vagina of female by the process called insemination.

In 1 ml of semen, 20 to 120 millions of sperms are present in human being.

Leydig's cells mature at 10 yrs. of age.

In humans (and most vertebrates), the first polar body does not undergo meiosis II.

The first polar body is, therefore, formed merely to get rid of unwanted chromosomes.

65-74 days are required to complete the cycle of spermatogenesis in human being. Open / Comment

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