Category: Development

57 Questions with Answers and Explanations on “Digestive System and Nutrition” for Biology Students.1. Duct leading from parotid gland and opening into vestibule is (a) Haversian duct Image Source: 40two.info ADVERTISEMENTS: (b) Stenson’s duct(c) Wolffian duct(d) infra-orbital duct. ADVERTISEMENTS: Answer and Explanation:1. (b): Parotid glands are the largest salivary glands. They lie on the sides of the face, just below and in front of the ears. The parotid ducts, also called Stenson’s ducts, open into the vestibule opposite the upper second molar teeth.2. Wharton’s duct is associated with (a) sublingual salivary gland ADVERTISEMENTS: (b) parotid salivary gland(c) submaxillary salivary gland(d) Brunner’s glands.Answer and Explanation:2. (c): The Wharton’s ducts are associated with submaxillary glands that lie at the angles of the lower jaw. These ducts open under the tongue. Ducts of…

47 Questions with Answers and Explanations on “Reproduction & Embryonic Development” for Biology Students.1. Cells become variable in morphology and function in different regions of the embryo. The process is (a) differentiation Image Source: mba.ac.uk ADVERTISEMENTS: (b) metamorphosis(c) organisation(d) rearrangement ADVERTISEMENTS: Answer and Explanation:1. (a): Differentiation are the changes from simple to more complex forms undergone by developing tissues and organs so that they become specialized for particular functions. Differentiation occurs during embryonic development and regeneration.2. Human eggs are (a) alecithal ADVERTISEMENTS: (b) microlecithal(c) mesolecithal(d) macrolecithalAnswer and Explanation:2. (a): Eggs are of 4 types regarding the amount of yolk present in them: (i) Alecithal egg: Almost free of yolk e.g. man.(ii) Microlecithal egg: Very small amount of yolk e.g. Branchiostoma.(iii) Mesolecithal egg: Moderate amount of yolk eg. Frog’s egg(iv) Macrolecithal…

35 Questions with Answers and Explanations on “Biomolecules” for Biology Students.1. In double helix of DNA, the two DNA strands are Image Source: 158b1e.medialib.glogster.com ADVERTISEMENTS: (a) coiled around a common axis(b) coiled around each other(c) coiled differently(d) coiled over protein sheath. ADVERTISEMENTS: Answer and Explanation: 1. (a): According to Watson-Crick model, the DNA molecule consists of two long, parallel chains which are joined together by short crossbars at regular intervals. The two chains are spirally coiled around a common axis in a regular manner to form a right handed double helix.2. RNA does not possess (a) uracil ADVERTISEMENTS: (b) thymine(c) adenine(d) cytosine.Answer and Explanation: 2. (b): DNA and RNA both consist of nitrogenous bases-purines and pyrimidines. The purines (adenine and guanine) in DNA and RNA are the same. The pyrimidine,…

In any rational system of law a decision of a judge on a particular case is binding upon the parties only. The best of the law of England is, however, judge-made law. A decided case is not merely one which may be followed, but it is obligatory on the court to follow its ratio decidendi. This portion of the law has not been created by an Act of Parliament, but is the work of the courts and is recorded in the law reports instead of in the statute book. Image Source: disabilitydunktank.comThis traditional view expanded by Hale and Blackstone main­tained that the judges only discover law, inasmuch as it is merely declaratory of existing law. ADVERTISEMENTS: According to Hale, “It is true the decisions of courts of justice, though by…

Legal provisions regarding punishment for Attempt to commit Murder under section 307 of Indian Penal Code, 1860.Attempt to commit Murder: Section 307 of the Indian Penal Code provides that: Image Source: desaign.info ADVERTISEMENTS: “Whoever does any act with such intention or knowledge, and under such circumstances that, if he by that act caused death, he would be guilty of murder, shall be punished with imprisonment of either description for a term which may extend to ten years, and shall also be liable to fine, and if hurt is caused to any person by such act, the offender shall be liable either to imprisonment for life, or to such punishment as is hereinbefore mentioned.Attempts by life convicts:- When any person offending under this section is under sentence of imprisonment for life,…

15 Short Questions with Answers on “Mesopotamian Civilization” for Class IX Students (History and Civics ): image source: 70ee57.medialib.glogster.comQ1. From which word is the term ‘civilization’ derived? Ans: The term ‘civilization’ comes from the Latin adjective civilis which refers to a citizen. ADVERTISEMENTS: Q2. How has Robert M. Adams defined civilization? Ans: Robert M. Adams defines civilization as a society with functionally interrelated sets of social institutions: class stratification, political and religious hierarchies complementing each other in the central administration of territorially organized states and lastly, a complex division of labour, with skilled workers, soldiers and officials existing alongside the great mass of peasant producers.Q3. What do you understand by ‘Bronze Age Civilization’? ADVERTISEMENTS: Ans: Bronze played a vital role in the growth of the first civilizations. Hence these civilizations…

Essay on the Process of Ecological Succession !The process of ecological succession can be best followed by studying the following types of successions in different habitats: image source: i.ytimg.com A. Hydrosere (Aquatic succession): The development of a fresh-water body —lake, pool, or pond into a mesic forest can be observed in the limited area, often a freshly-built deep reservoir or a man-made pond. ADVERTISEMENTS: As the soil has been dug out from such a pond, there are very little or no nutrients in the sub­stratum below the water and the water itself do not contain any nutrients due to this fact, this stage is characterized by a bottom barren of plant life or animal in such a new and virgin pond, aquatic succession or hydrosere starts with the colonization of…

Short Essay on the Human Reproductions for School Students:(a) Menstruation (b) Follicular phase (c) Luteal phase Image Source: online.science.psu.edu (a) Menstruation: ADVERTISEMENTS: It is a cyclic event that takes place in human females after every 28/ 29 days. It starts from the age of puberty till the age of 50 yrs.During the process the disintegrated endometrium, blood vessels and degenerated ovum (unfertilized) is released as a menstrual flow. It lasts upto 3-4 days.The fluid comes out through vagina. The cyclic menstruation is an indicator of normal reproductive phase/and it is in between menarche and menopause. It occurs only when the ovum is unfertilized and if fertilized then it results in pregnancy and absence of menstruation. (b) Follicular phase: This phase comes after menstruation. During this phase the primary follicles in…

13 Questions with Answers and Explanations on “Use of Microbes in the Human Welfare” for Biology Students: Image Source: intechopen.com1. Mention the microbes groups and chemical infectious agents that cause diseases to human and other organisms? ADVERTISEMENTS: Ans. Microbes are—protozoa, bacteria, fungi, microscopic plants. Chemical agents (proteins) are—viruses, viroids, prions.Q.2. Give examples to prove that microbes release gases during metabolism. Ans. (i) Production of C02 gas in dough for making foods such as dosa, idli, bread, swiss cheese etc.(i) Production of CO-, gas methane and hydrogen from the anaerobic sludge, gobar— the gas is also called biogas/gobar gas. ADVERTISEMENTS: Q.3. In which food would you find lactic acid bacteria? Mention some of their useful applications? Ans. Milk and curd.They convert the milk into curd. This increases the nutritional quality by…

Here is your Essay on the Community Evolution !Like the responses of communities to changing biotic condi­tions, community evolution involves progressive changes in climax communities. Because the evolution is exceedingly slow, it cannot be observed in operation and few instances from the fossil record are sufficiently complete to show the process in action. ADVERTISEMENTS: The example that best demonstrates evolution of the basic structure of the community is that of the development of a terres­trial community of a modern type by early reptiles some 250 mill­ion years ago.Between the time when vertebrates (amphibians) first became able to lead a predominant terrestrial existence some 350 million years ago and the establishment of an essentially mod­ern type food web some 100 million years later, the structure of terrestrial community was decidedly different…