Four important parts that consist in the digestive systemof ascaris

Alimentary canal:Ascaris has a straight alimentary canal from mouth to anus, consisting of mouth, pharynx, intestine and rectum. Image Source: siera104.com ADVERTISEMENTS: Important parts consist in the digestive system of ascaris1. Mouth:It is a triradiate aperture, guarded by three lips.2. Pharynx: ADVERTISEMENTS: This is short, cylindrical, thick walled and muscular pharynx. The wall of pharynx consists of a syncytial epithelium traversed by radial muscles and containing glands.Mouth and pharynx are lined internally by cuticle and ectoderm derived from embryonic stomodeum, and represents the foregut.The lumen of pharynx is triradiate, each ray is a deep groove divide the pharynx into three sectors- dorsal and two subventral.All the three sectors contain branched pharyngeal glands. Radial fibers of pharynx wall help in its expansion and marginal fibers help in preserving the triradiate form…
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420 words essay on Let Us Save the Wildlife

Free sample essay on Let Us Save the Wildlife. Some wildlife species like the rhinoceros, cheetah, elephant, crocodile, snake etc. are hunted by the poachers. There are persons of much daring who go into the forest stealthily without the knowledge of the wildlife department authorities and shoot the animals which may be a source of great gain to them.Poachers have long been active in several parts of the world. The elephants are killed for their tusks of great value. A pair of tusks in the international market may fetch an enormous amount to the poachers. The wildlife department authorities are unable to put a stop to poaching despite their utmost vigilance. The African elephants and the Asian elephants are killed for their tusks. The late forest brigand, Veerappan of India,…
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Sample essay on The Role of the Opposition Parties in a Democracy

Free sample essay on The Role of the Opposition Parties in a Democracy. Nowadays we see noisy scenes in Parliament and in the Assemblies of the States. This is not a healthy feature of a democracy.In many other countries there are only two political parties. One party comes to power and the other party is the opposition party. The democratic principle is that the opposition party should not think that the ruling party is its enemy. The opposition party has not come to power just because people have not voted it to power. When it was in power it might have incurred the displeasure of the people by its wrong policies. And so it could not come to power. Another party was voted to power.It is not the job of…
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Eight important parts in the water vascular system or ambulacral system of asterias

Important parts in the water vascular system or ambulacral system of asterias are listed below: (1) Madreporite: ADVERTISEMENTS: It is a thick sieve like calcareous plate situated on the aboral surface of the central disc. It bears as many as 250 minute pores on the surface and they lead into pore canals. All pore canals unite to form collecting canals within the substance of madreporite. Below the madreporite, collecting canal communicates with stone canal through ampulla. Image Source: 1.bp.blogspot.com (2) Stone canal: It is S-shaped tube, which opens on the oral side into a ring canal around the mouth. It is also known as madreporite canal. Its walls are supported by a series of calcareous rings, hence the name stone canal. Inner lining of the wall bears cilia or flagella,…
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863 words essay on Man and Environment (Free to read)

Free sample essay on Man and Environment. Our environment is really unique because it sustains life and growth. On other planets there is no environment and, therefore, no life.Environment means all that surrounds us. It is a very complex and comprehensive phenomenon. It consists of the climate, geography, geology and all the natural resources that nature has bestowed upon us. Life is there because of our peculiar biosphere and ecosystem. There is life on this planet because of a certain balance between these various elements. Without this balance, our planet would have been just another sterile and lifeless planet revolving round the sun.Our life depends on healthy and balanced environmental conditions. Our health, working habits, lifestyle, and behaviour, etc. are closely linked with all that surrounds us. The climate is…
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Ten different types of adaptations in the morphology of leeches

According to their parasitic mode of life leeches show a number of adaptations in their morphology, habit and habitat: 1. Habit and habitat: Leeches swim actively in search of hosts and inhabit in such a pond or lake where cattle, men and other vertebrates visit frequently. Image Source: 185.26.182.219 ADVERTISEMENTS: 2. Slime glands: These are present in body wall. Their secretion keeps the body moist and slippery so that the host can’t remove it easily while it sucks blood. 3. Suckers: ADVERTISEMENTS: These are the organs that help in locomotion as well as in making firm adhesion to the host’s body while feeding. 4. Jaws and pharynx: Triradiate jaws are equipped with denticles, able to make incision in the skin of the host. A muscular suctorial pharynx works as a…
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1141 words essay on the Aim of Education (Free to read)

Free sample essay on the Aim of Education (Free to read). The main aim of education is the all-round development of a student. Its purpose is to develop a student into a full, whole and integrated person.The main aim of education is the all-round development of a student. Its purpose is to develop a student into a full, whole and integrated person. Thus, the objectives to be achieved through education and training are many and comprehensive. Education helps in achieving and developing skills, abilities, insights and scientific temper. Besides literary and aesthetic appeal of education, there are utilitarian aspects as well and they are equally important. Education aims at developing and bringing out the best of a student’s inner personality, without neglecting the outer and material aspects. Education also means…
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1636 words essay on Drought and Flood in India (Free to read)

Free sample essay on Drought and Flood in India. The rainfall in India varies from place to place and year to year. The north-eastern states of Assam, Arunachal Pradesh, Meghalaya, and Nagaland, etc. receive very heavy rainfall.The Indian sub-continent has a distinct geographical and historical identity. Its territories extend 3,214 kilometers between the extremes of the north and the south, and 2,933 kilometers between those of the east and the west. This vast landmass called India has been a playground of the monsoon from times immemorial. Monsoon is the seasonal wind of the Indian Ocean. By the end of the month of May, a low pressure is formed in the coastal plains in the west of India which attracts the monsoon winds and then there are occasional rains. In early…
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1491 words essay on India in the 21st Century

Free sample essay on India in the 21st Century. We have stepped into a new century. Talking about the future is always exciting. Man wants to peep into the future to find out what is in store for him and his fellow beings.Man’s curiosity to know about the future and the shape of things and events to come has given rise to such subjects as astronomy, astrology, and palmistry, etc., which try to predict the events to come.Now, what would be the future of India in the coming years of this century? Can we project and predict the future of India as a nation with some certainty and precision? Are we in a position to predict the conditions that are likely to prevail in future? How would the country look…
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1429 words essay on the importance of Human Rights

Free sample essay on the importance of Human Rights. Human right to live and exist, the right to equality, including equality before law, non-discrimination on grounds of religion, race, caste, sex or place of birth, and equality of opportunity in matters of employment, the right to freedom of speech and expression, assembly, association, movement, residence, the right to practice any profession or occupation, the right against exploitation, prohibiting all forms of forced labour, child labour and trafficking in human beings, the right to freedom of conscience, practice and propagation of religion and the right to legal remedies for enforcement of the above are basic human rights. These rights and freedoms are the very foundations of democracy.Obviously, in a democracy the maximum number of the freedoms and the rights are enjoyed…
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