Category: Sciences

21 Questions with Answers and Explanations on “Human Health and Disease” for Biology Students: Image Source: nature.comQ. 1. How you can maintain good health? Ans. Good health can be maintained by balanced diet, personal hygiene and regular exercise. ADVERTISEMENTS: Q. 2. What are pathogens? Ans. The disease causing organisms are called pathogens.Q. 3. A doctor identified following symptoms in a patient. ADVERTISEMENTS: (a) Respiration problem, fever, cough and headache (b) Gray nails, bluish fingernails and lips. Name the disease and causative agent. Ans. Disease —Pneumonia, Causative agent —S. pneumoniaeQ. 4. What is haemozoin? ADVERTISEMENTS: Ans. It is a toxic substance released by infected RBCs causing chill and high fever every 3-4 days in case of malaria.Q. 5. Which stage of Plasmodium is introduced into human body, when a female Anopheles…

25 Questions with Answers and Explanations on “Use of Microbes in Human Welfare” for Biology Students: Image Source: intechopen.comQ. 1. Expand the term LAB. Ans. LAB—Lactic Acid Bacteria. ADVERTISEMENTS: Q. 2. Mention any two benefits of lactic acid bacteria. Ans. 1. Helps in formation of curd from milk.2. Checks disease causing, microbes in our stomach. ADVERTISEMENTS: Q. 3. How is ‘Roquefort cheese’ ripened? Ans. It is ripened by growing a specific fungi.Q. 4. Bacteria cannot be seen with the naked eyes but these can be seen with the help of a microscope, If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why? Ans. Curd. Because it can be easily viewed…

26 Questions with Answers and Explanations on “Organism and Populations” for Biology Students: Image Source: i.ytimg.comQ. 1. Give two examples to biomes. Ans. (1) Desert ADVERTISEMENTS: (2) Rain forestQ. 2. How are the major biomes on earth formed? Ans. The major biomes are formed due to annual variation in the precipitation in a region. ADVERTISEMENTS: Q. 3. How are varieties of habitats formed in a biome? Ans. The variations at regional and local levels within a biome leads to the formation of habitats.Q. 4. How does the temperature affect the organisms? Ans. Temperature affects the enzymes kinetics and through this it affects the basal metabolism of the individual. ADVERTISEMENTS: Q.5. If a marine fish is placed in a fresh water aquarium, will the fish be able to survive? Why or…

Here is your essay on Amensalism !Contrasting with commensalism is amensalism, a situation in which one population definitely inhibits the other while remaining unaffected itself. By so modifying the environment, the organism improves its own chance of survival.Ammensalism commonly involves some type of chemical interaction, by which the organisms of one species affects the well-being and growth of individuals or the population biology of other, is called allelochemic (see, Whittaker, 1970, smith. 1974, Kendeigh, 1974). Thus, chemicals released by one species, which act on the growth, health, and behaviour of another species, are called ailelochemicals. Allelo- chemical effects are of three general sorts: allomones, kairomones and depressants. image source: upload.wikimedia.org ADVERTISEMENTS: Allomones are chemicals which give adaptive advantage to the organism that produces the chemical. Examples include repellents, which provide…

There exists a specific relationship between marginal cost curve and average total cost curve. Irrespective of any influence, marginal cost curve intersects the average total cost from below at the lowest point of the average total cost curve.Average total cost falls when marginal cost is less than the prevailing average total cost, and average total cost rises when marginal cost is greater than the prevailing average total cost. ADVERTISEMENTS: To the left side of Q, marginal costs are smaller than average total costs causing average to decline (figure 9.6). Likewise, to the right side of Q, marginal costs are higher than average total costs causing average to increase.The relationship between marginal cost and average cost can be easily established with the help of simple arithmetic. Suppose, a student obtains 60…