Classification of Taenia solium Phylum Platyhelminthes Class Cestoda Subclass Eucestoda Order Taenioidea Genus Taenia Species solium Habits and Habitat of Taenia solium Taenia solium, also known as pork tapeworm, is found worldwide. Thus, its distribution is cosmopolitan. Its adults dwell in man’s small intestine as an internal parasite, i.e., endoparasitic, … Read more
Reproductive system of earthworm Earthworms do not reproduce asexually. Reproductive organs are somewhat complicated. The pheretima is monoecious or hermaphrodites having both male and female reproductive organs in the same individual. They cannot fertilize their own eggs because they are protandrous. Cross-fertilization occurs as a rule because of the relative … Read more
Life cycle of Ascaris lumbricoides In the life cycle of Ascaris, there is no secondary host. The life cycle of Ascaris is monogenetic as it involves only one host i.e. Man. Figure: Life cycle of Ascaris lumbricoides. Image Source: CDC. 1. Egg in feces The sexually mature female produces as … Read more
Reproductive system of Ascaris lumbricoides Only sexual reproduction occurs in Ascaris. Sexes are separate i.e., dioecious in Ascaris and these roundworms also show distinct sexual dimorphism. Males are smaller than the females and they also have a curved tail with pre and post anal papillae, cloaca, and a pair of … Read more
Digestive System of Ascaris lumbricoides I) Alimentary canal: It is a straight and complete tube that starts with the mouth at the anterior end and ends with the anus at the posterior end. It comprises a short pharynx or esophagus representing foregut, along intestine or mid-gut, and short rectum or … Read more
Habitat of Ascaris lumbricoides Ascaris lumbricoides are the largest most familiar endoparasites of the man freely living in the lumen. It has also been reported from animals like pigs, cattle, sheep, and squirrels. It inhabits the small intestine of more frequently children than adults. It is cosmopolitan in distribution. Sometimes, … Read more
Nutrition of Amoeba proteus Food and selection of food Amoeba is carnivorous. It feeds by phagocytosis. The mode of nutrition is Zootrophic or holozoic. i.e. it requires ready-made (solid form) organic substances for food. The food consists of algal cells and filaments, bacteria, desmids, flagellates, ciliates, small metazoans such as … Read more
Classification of Amoeba proteus Phylum: Protozoa Subphylum: sacromastigophora Superclass: Sarcodina Class: Rhizopodea Subclass: Lobosia Order: Amoebida Genus: Amoeba Species: proteus Habit and Habitat of Amoeba proteus Amoeba proteus is widely distributed and commonly found on the bottom mud or on the underside of aquatic vegetation in freshwater, ponds, ditches, lakes, … Read more
Paramecium reproduces asexually by transverse binary fission and also undergoes several types of nuclear reorganization, such as conjugation, endomixis, autogamy, cytogamy, and hemixis, etc. 1. Transverse binary fission (Asexual reproduction) This is the commonest type of Asexual reproduction in Paramecium. It occurs during the favorable condition when food is available … Read more
1. Food Paramecium feeds in a holozoic manner, like an amoeba. The food comprises chiefly bacteria and minute protozoa which floats in the water in which it lives. It also feeds unicellular plants (algae, diatoms, yeasts, etc.) and small bits of animals and vegetables. Paramecium swims to a place where … Read more
Habit and Habitat Paramecium caudatum (Gr., paramekes=oblong+ L., caudata=tail) is a free-living organism which is one of the most common species of Paramecium having worldwide distribution. It is commonly found in freshwater, ponds, pools, ditches, streams, lakes, reservoirs, and rivers. It is usually found abundant in water containing decaying organic … Read more
The excretory organs are segmentally arranged, microscopic, coiled tubules called nephridia. Nephridia are ectodermal in origin. These are typically unbranched, and their inner ends open into coelom by a ciliated funnel, called nephrostome. A large number of small-sized nephridia are found in each segment which are called micronephridia and mesonephridia. … Read more
Circulatory system of earthworm The circulatory or blood vascular system of an earthworm is a closed type. It consists of the blood vessel, heart, capillaries, and blood glands. Blood is composed of fluid plasma and colorless corpuscles. Blood is red in color due to the presence of respiratory pigment hemoglobin … Read more
Habit and Habitat of Earthworm The Earthworms are burrowers. It prefers to live in the burrow during the day and comes out at night and in damp cloudy weather for the search of food, reproduction, and exploring fresh habit. Thus, nocturnal in habit. The rainy season is the most favorable … Read more
Well developed and concentrated nervous system. Consists of 3 parts: the central, peripheral, and sympathetic nervous system. Figure: Nervous System of Earthworm. Image Source: Meridian Technical Charter High School. 1. Central nervous system It comprises of the anterior nerve ring or brain ring and the posterior ventral nerve cord. Nerve … Read more
Earthworms are simple, commonplace creatures, are of greater economic value to human beings in different ways. Our earth would be an afar different place without them. They have both useful and harmful aspects of mankind. Useful effects of Earthworm In Agriculture They are beneficial but sometimes they may damage the … Read more
Earthworms have well-developed sense organs or receptor organs. Simple in structures. Reacts to a number of stimuli with the help of 3 types of sense organs: epidermal receptor, buccal receptor, and photoreceptor. Figure: Sense organs of Earthworm. Image Source: Studio Biology. Epidermal receptors Distributed all over the epidermis but more … Read more
Digestive System of Earthworm consists of the alimentary canal and the digestive glands. Image Source: https://digestivesystemgroup2.weebly.com/earth-worm-lumbricus-terrestris.html Earthworm Alimentary Canal Complete straight tube throughout the length of the body from mouth to anus. Mouth constitutes its anterior and anus its posterior openings receptively. Functionally regionated into various parts i.e. mouth and … Read more