Sexual reproduction in plants (angiosperms)
Flowers are the reproductive organs in Angiosperms. A flower is borne on a stalk called pedicel with an upper swollen region known as thalamus. A […]
Biology
Hormonal regulation of ovulation and menstruation in women
The male is continuously fertile from puberty to old age and sex hormones are secreted throughout that period in a constant rate. However, in case […]
Blood vessels (Types, structure and functions)
Blood vessels Our circulatory system is of closed type. i.e. blood flows within blood vessels which are network of closed tube like structures with walls. […]
Blood and plasma (Appearance, composition and functions)
Blood An average adult person has about 4-6 liters of blood, which forms about 8% of the body weight. The study of blood is called […]