There are approximately 34,000 known fish species throughout the world which live in either fresh or saltwater environments. They are cold-blooded animals but only the opah (Lampris guttatus) is warm-blooded fish which is also known as cravo, kingfish, moonfish, and Jerusalem haddock. There are two main groups of fish, namely Chondrichthyes and Osteichthyes based … Read more
Fins are one of the most distinguishing features of a fish and they have several different forms. Two types of fins are found in most of the fish: median and paired fins. Median fins are single in number which runs down the mid-line of the body. In fishes, median fins are dorsal, caudal and anal … Read more
There are various cell organelles in the cell. They do many important functions inside the cell. Among the cell organelles, lysosomes are present in the eukaryotic cells while both prokaryotic and eukaryotic cells bear ribosomes. Lysosomes are bounded by membrane and different types of digestive enzymes are present here. It is also known as the … Read more
On the basis of internal structure, cells are of two types: Prokaryotic and Eukaryotic cells. Prokaryotic cells are simple and small in size while eukaryotic cells are complex and large in size. Eukaryotic cells have true nucleus and nucleolus with different types of membrane-bound cell organelles such as Endoplasmic reticulum, Golgi body, Mitochondria etc. Well … Read more
Today, environmental pollution is a major problem which affects humans and other life forms. The earth is a vast ecosystem within it. Green plants are the primary producer in every ecosystem and constitute the functional components. They take carbon dioxide and release oxygen during the process of photosynthesis and maintain equilibrium in the atmosphere. There … Read more
Leuckart (1847) first coined the name Cnidaria. The term ‘Cnidaria’ is derived from two words; Gr. Knide=nettle and L. aria=like or connected with. Cnideraia are also known as Coelenterata. They have diverse colorful, radially symmetrical bodies which are known as the flower of the sea. The phylum Cnidaria contains more than 10,000 living species, among … Read more