Respiration in Plants
Respiration in plants takes place through Stomata in leaves, Lenticels in stem. Heat is evolved during respiration in plants.
Biology Class 10
Population
The total world population about 50,000 years ago was approximately 1 million. About 10,000 years ago, the total world population had reached
Health Organizations
Health Organizations strive to take steps individually, at the national level and globally to safeguard the health interests of their citizens.
Human Evolution
Evolution can be defined as the formation of more complex organisms from pre-existing simpler organisms over a certain period. It is a slow, but progressive, natural, sequential development
Pollution
Pollution is the addition of any substance in the environment which contributes to the deterioration or contamination of the environment, making it less favourable for organisms.
The Reproductive System
The female reproductive system consists of Ovaries, Oviducts, Uterus, Vagina, Vulva. The male reproductive system consists of Testes
Endocrine System
Multicellular organisms communicate with and control their various activities by means of two major systems the endocrine system and the nervous system
The Sense Organs
The sense organs enable us to be aware of the condition of the environment. The two eyes are located in deep sockets called orbits. The upper and lower moveable eyelids protect the front surface of the eyes.
The Nervous System
The human brain is well protected inside the cranium or the skull. In adults, it weighs about 1.35 kg. It is protected by three meninges—dura mater, arachnoid and pia mater.
The Excretory System
The filtrate left after reabsorption and tubular secretion is called urine. The urine passes from the collecting duct to the pelvis of the kidneys. From there, it is sent to the urinary bladder through the ureters.