Learn it, Get it
Definition: The arrangement of teeth in the upper and lower jaws, mainly on premaxilla, maxilla and dentary bones is called dentition. Teeth evolved from denticles. Absence of Teeth: A typical mammalian tooth can be distinguished mainly into two regions: Crown and Root. There are three kinds of tissues in a typical tooth. They are Enamel, … Read more
Definition: The additional organ which are concerned with respiration other than gills are known as Accessory Respiratory Organ in fish. These organs developed mostly in tropical fresh water fishes to meet the extra demand of O₂ during summer to aestivate over prolonged drought. The accessory respiratory organs in fish are:- 1.) Skin/Integument: Cartain eels like Anguila sp. & Amphipnous sp. and … Read more
Class Mammalia comprises warm-blooded vertebrates with characteristics such as hair or fur, mammary glands for feeding young, and three middle ear bones. Mammals include a wide range of species, from humans and whales to bats and rodents, inhabiting diverse environments worldwide. General Characters: 1. Body covering: Body is covered by epidermal hair. 2. Mammary Gland: Mammary glands are present, … Read more
Class Aves includes birds, characterized by feathers, beaks without teeth, and laying hard-shelled eggs. Birds are warm-blooded, have a high metabolic rate, and most species are capable of flight. General characters of Class Aves: 1) Body: Body is spindle shaped divided into head, neck, trunk and tail. Body is covered by feathers, forms the exoskeleton. 2) Fore limbs: Fore … Read more
Class Reptilia comprises a diverse group of cold-blooded vertebrates that includes snakes, lizards, turtles, crocodiles, and tuataras. Reptiles are characterized by their scaly skin, which helps prevent water loss, and their ability to lay shelled eggs on land, though some species give live birth. General Characters of Class Reptilia: 1) Habitat: They are inhabitants of terrestrial … Read more
Class Amphibia includes animals that typically have a dual life cycle, with aquatic larval and terrestrial adult stages. They have moist, permeable skin that facilitates gas exchange, and their reproduction generally involves laying eggs in water. Amphibians breathe through gills during their larval stage and through lungs and skin as adults. General Characters of Class … Read more