Class 10th

Sex Determination in Human Beings  A person can have a male sex or a female sex. The process by which the sex of a person is determined is called sex determination. Genetics is involved...

Interior of the Earth   The internal structure of the earth is layered. The Earth is generally divided into four major layers: the crust, mantle, inner core, and outer core. Earth’s crust is the outermost...

Sex determination in human beings Human beings have 23 pairs of chromosomes in the nucleus of the cell. Out of this two chromosomes are sex chromosomes X and Y. The female has two X...

ACCUMULATION OF VARIATION DURING REPRODUCTION Heredity :- The process of transfer of characters or traits from the parents to their offsprings is called heredity. Variations :- The differences between the characters or traits among...

Reproduction in human beings Puberty-it is the period during which adolescents reach sexual maturity and become capable of reproduction During early teenage whole new set of changes occurs, appearance of body and proportions change...

SEXUAL REPRODUCTION In a population variations are useful for survival of a population. Sexual mode of reproduction allows individuals to have more variations to be generated. Generation of variations in DNA copying mechanism of...

Reproduction  Reproduction is defined as a biological process in which an organism gives rise to young ones (offspring) similar to itself. Reproduction at its basic level involves creation of the copy of DNA DNA...

Airways The world’s first air-mail service was started in India at Allahabad; on 18th Feb 1911 on  the occasion of Kumbh mela Regular airmail services were started by Tata Sons Ltd, between Karachi and...

Railways Indian Railways is one of the largest PSU in the Country The Indian Railways route length network is spread over 115,000 km, with 12,617 passenger trains and 7,421 freight trains each day from...

Lifelines of National Economy Goods and services are transported using three modes of transport. According to the medium , transport can be classified into land water and air transport. Means of Transport Land Roadways Railways Pipelines 2. Water Inland and...