The science and practice of maintaining good health is known as hygiene. The main factors which contribute to personal hygiene and good health are
Biology Class 9
The skin is the largest organ of the body. Lowermost layer of the skin which contains adipose tissue, Insulates the skin, acts as a shock absorber and anchors the skin to the underlying bones and muscles.
A condition of the body in which the vital functions are disturbed physiologically or psychologically is called a disease. Health is the state of complete physical, mental and social well-being.
Waste is any substance which is discarded after its primary use, or it is worthless, defective and of no further use. Examples: Spoilt food, vegetable peels, leaves, wood, grass, paper, leather, cotton, cattle dung etc. In this article you will find Safe Waste disposal methods
Before moving onto the ‘Structure of seeds’ you should learn about the seed. The seed is a mature and ripened ovule of a flower which is formed after fertilization. It stores food material for the nourishment of the embryo during germination.
The body of living organisms is made up of an important framework of bones called the skeletal system or the skeleton. The skeleton consists of bones, cartilages, ligaments, tendons and fascia.
Vegetative propagation or vegetative reproduction is a form of asexual reproduction in which a relatively large, differentiated part of the plant’s body gets detached from the parent plant and develops into an independent plant.
A flower is a specialized shoot in which the leaves are modified to form floral structures. A flower which has all the four whorls, calyx, corolla, androecium and gynoecium, is called a complete flower. Examples: Hibiscus, rose, sunflower etc.
Bacteria are the most primitive unicellular prokaryotic organisms which do not have a well-defined nucleus and are not enclosed within a nuclear membrane.
Pollination is the process of transfer of pollen grains from the anther of a stamen to the stigma of a carpel of a flower. The transfer of pollen grains from the anther of a flower to the stigma of the same flower or another flower on the same plant is called self-pollination.