by abhishek | Aug 19, 2020 | Excretion
In human beings excretion of waste materials take place through a well developed system of organs called urinary system. The urinary system of human beings consists of: two kidneys, two ureters, a urinary bladder and a urethra. Kidneys In human beings a pair of...
by abhishek | Aug 19, 2020 | Excretion
In earthworm carbon dioxide and nitrogenous wastes are the main waste materials. The carbon dioxide is excreted out from the body through its moist skin by the process of diffusion. The nitrogenous wastes are excreted out of the body by special excretory organs...
by abhishek | Aug 18, 2020 | Excretion
Metabolic activities of an organism produce several types of by-products. Some of these by-products are waste materials. These waste materials are often toxic in nature and cannot be used in the body. For example, a large amount of carbon dioxide, urea and water is...
by abhishek | Aug 18, 2020 | Excretion
Amoeba is a unicellular organism found in fresh water. In amoeba carbon dioxide and ammonia are the main waster materials. These waste materials are excreted out by the process of diffusion through general body surface. In amoeba, contractile vacuoles also play...
by abhishek | Aug 18, 2020 | Nutrition
The digestive system in human beings is made of alimentary canal and some external glands like liver, pancreas and salivary glands which help in digestion of food. The alimentary canal is a long tube having a length of 8-10 meters. The various organs of human...
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