Tag Archives: Biology

About Human Digestive System

Digestive system of human beings consists of alimentary canal or gut and some accessory organs. Alimentary Canal include Mouth Oral (Buccal) cavity Pharynx Oesophagus Stomach Small intestine Large intestine Rectum and anus Accessory organs include Teeth Salivary Glands Gall bladder Pancreas Liver Alimentary Canal Alimentary canal is coiled, muscular, continuous tube running through the ventral body cavity extending… Read More »

Human Reproductive System

Human reproductive system becomes functional at a definite age called puberty. Normally, males attain puberty at the age of 13 to 14 years, while females attain puberty at the age of 10 to 12 years. Testis is the primary sexual organ of male whereas ovary is primary sexual organ of female. The male gonad produces sperm and female… Read More »

Photosynthesis: Equation and Process

Photosynthesis means synthesis of food with the help of sunlight. The overall equation of photosynthesis is Photosynthesis process takes place only in green parts of the plant, mostly in leaves and to lesser extent in green stems or floral parts of the plants. Leaves of the plant are known as light powered food factories. A green substance called… Read More »

Classification of Animal Kingdom

When any plane passing through the central axis of the body divides the organism in two halves that are approximately mirror images it is called Radial symmetry and the animals showing radial symmetry are called Radiata. When the body can be divided into identical left and right halves in only one plane. This kind of symmetry is called… Read More »

Organs of Human Respiratory System

The human respiratory system consists of external nares or nostrils, nasal cavity, nasopharynx, larynx, trachea, bronchi, bronchiole and lungs. The air enters into the nasal cavity through the nostrils. Larynx is a small box and it forms the connection between pharynx and the windpipe or trachea. Larynx is also called voice box. Larynx is covered by pieces of… Read More »

Vitamins – Function, Deficiency and Sources

Vitamin Function Deficiency Sources A-Retinol For normal growth in children. To maintain conjunctiva aids in night vision. To maintain skin and mucous membrane. Roughness and dry skin. Inability to see in dim light. Xerophthalmia leading to blindness (cornea becomes rough and dry). Nyctalopia (Night blindness). Fish, liver, oil, butter, milk, egg B1-Thiamine 1st vitamin to be discovered by… Read More »

About Male Reproductive System

The human male reproductive system is composed of a pair of testes, genital ducts, several accessory glands and penis, Testis is the primary male reproductive organ. it lies in small sac-like muscular structure outside the abdominal cavity called scrotum. Image Source: Wikimedia Testes In male adults, each testis is a small, pinkish and oval. But composite structure about… Read More »

About Female Reproductive System

Female reproductive system consists of the two ovaries, two oviducts (fallopian tubes), the uterus, cervix, a vagina, accessory genital glands, mammary glands, etc. In females, paired ovaries are located in the abdominal cavity near the kidney. The ovaries perform dual function of (i) production of female gamete (ovum) and (ii) secretion of female hormones (estrogen and progesterone). Each… Read More »

Human Bones, Joints and Muscles

1. Bones The Skeleton System: The human endoskeleton is made up of bones and cartilage of various types. Bone is a hard connective tissue in which the ground substance is very hard and contains calcium salts. The marrow of the long bones is the site for the haemopoiesis, i.e. formation of blood and blood cells. Human skeleton consists… Read More »

Classification of Plant Kingdom – Cryptogamae & Bryophyta

Depending upon the presence or absence of flowers and seeds entire classification of plant kingdom is divided into two types. They are Cryptogamae and Phanerogamae. 1. Cryptogamae: Cryptogams include all non-flowering plants such as algae, fungi, lichens, mosses and fern (Kryptos: concealed; gamus: marriage). Cryptogamae is further subdivided into three parts: Thallophyta, Bryophyta and Pteridophyta. 1.1 Thallophyta: Both… Read More »