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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...

Control and coordination IN THIS LESSON YOU WILL LEARN ABOUT Animal – nervous system what is nervous system structure and function of neurons reflex arc: definition, component, location, function, examples Human brain difference between central nervous...

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...

Wave Length - The Minimum Distance in which a wave repeats itself is called its wavelength At the time Maxwell predicted the existence of electromagnetic waves, the only familiar electromagnetic waves were the visible light...

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...

ANIMALIA Porifera These are non-motile organisms with pores all over their body leading to canal system that helps in circulating water throughout the body to bring in food and oxygen. These animals are covered...