Sex Determination In Human Beings Explained

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...

Heredity Evolution,Speciation Notes on Science For Class 10th

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...

Heredity And Evolution : Class 10 Notes on NCERT

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...

Sexual Reproduction in Human Beings : Study Notes for Class 10th Science

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 Plants : Science Notes for Class 10 Biology

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...

How do Organism Reproduce:Class 10th Science Notes on Biology

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...

Diversity in Living Organism:Animalia Class 9th Science Notes

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...
Moss Biodevirsity

Diversity in Living Organisms:NCERT Notes Class 9th

Classification is the Science of arranging organisms in series of groups and subgroups on the basis of their similarities and dissimilarities. Aristotle classified organisms on the basis of their habitat means the place...
Ligaments

Animal Tissue Classification and Notes Class 9 NCERT

ANIMAL TISSUES Epithelial tissue The covering or protective tissue in animal body are epithelial tissue, covering most organs and cavities it forms a barrier to keep different body systems separate. The skin, the lining of...

Plant Tissues NCERT Notes for Class 9 Science

What is Tissue Tissue is a group of cells that are similar in structure and/or work together to achieve a particular function. Eg :- In human beings the cells of the muscular tissue contract...