Description : A pond contains clean water. Which of the following activities will produce least pollution of water? a) Washing clothes in the pond c)domestic waste b) industrial waste d)Swimming in the pond
Last Answer : d)Swimming in the pond
Description : Which of the following is not a feature of potable water? a) It must be clean, colourless and odourless. b) It must be free from bacteria c) It must have excessive sodium ,calcium and magnesium d) It must contain dissolved oxygen and carbon dioxide
Last Answer : c) It must have excessive sodium ,calcium and magnesium
Description : The pollutants in water can be recognized by a) bad taste b)offensive odour c)growth of aquatic weed d)all the above
Last Answer : d)all the above
Description : When domestic sewage / fertilisers is released into rivers , the growth of algae and bacteria is a) promoted b)not affected c)inhibited d)None of the above
Last Answer : a) promoted
Description : 8. Write a short paragraph on the harmful effects of microorganisms. -Science
Last Answer : Microorganisms cause diseases in plants and animals Ex; Cholera in humans is caused by bacteria called Vibrio cholera. In animals, the virus causes foot and mouth diseases. ... food material. Some microorganisms spoil leather and clothes. Microorganisms are responsible for food poisoning.
Description : How does the body defend itself from microorganisms and other harmful substances that enter the airway during the breathing process?
Last Answer : The epithelium of the airway is a ciliated epithelium and has mucussecreting specialized cells. The secreted mucus covers the internal wall of the airway retaining organisms and foreign ... (sputum) and accidentally aspired objects. Breathing Process Review - Image Diversity: airway epithelium
Description : ______ is chemical produced by fungus which inhibit the growth of other harmful microorganisms. a) antibiotic b)antibodies c)vaccine d)immunity
Last Answer : a) antibiotic
Description : harmful chemicals
Last Answer : Need Answer
Description : Name some of the chemicals that are harmful to health. ?
Last Answer : Formalin , Sodium Carbide , Ethylene , Calcium Carbide , Hydrogen , DDT etc.
Description : The following statement is true in relation to drug toxicity' and poisoning': A. The two terms are synonymous B. When a toxic effect requires specific treatment, it is called poisoning C. ... is called poisoning D. Toxicity is caused by drugs while poisoning is caused by other harmful chemicals
Last Answer : C. A toxic effect which endangers life by markedly affecting vital functions is called poisoning
Description : How do you refer to someone who cannot smell?
Last Answer : answer:A quick search on google and I get the answer “Anosmia”. I ran it through google’s definition search which confirms that the term is correct :]
Description : No one can see me, hear me, feel me, or smell me. Yet, if you tell me... I can do all those things and more. Every person, animal, amphibian (or more) needs me. Without me my wielder ... be used if my bearer lives. You can create me cooperatively, but cannot create me manually. What am I? -Riddles
Last Answer : I am your brain.
Description : What is the use of biochar in farming? 1. Biochar can be used as a part of the growing medium in vertical farming. 2. When biochar is a part of the growing medium, it promotes the growth of nitrogen fixing microorganisms. 3. ... are correct? a) 1 and 2 only b) 2 only c) 1 and 3 only d) 1, 2 and 3
Last Answer : d) 1, 2 and 3
Description : When the Exxon Valdez oil spill occurred, technologists "fertilized" the oil-soaked water with _____ to modify the environment and stimulate he growth of naturally occurring microorganisms. a. nitrogen sources (e.g., urea) b. phosphorus compounds c. other mineral nutrients d. A-C above are correct
Last Answer : d. A-C above are correct
Description : Food must be moist, with a minimum water content of _____before contamination by microorganisms and spoilage can occur. a. 18% to 20% b. 10 to 15% c. 5 to 10% d. 0 to 5%
Last Answer : a. 18% to 20%
Description : What impurities are removed by a water filtration system?
Last Answer : Water filtration system can remove contaminants from the water. They also work to remove unwanted minerals from the water and improve clarity.
Description : Potassium Permanganate is used for purifying drinking water, because ________. (1) It is a reducing agent (2) It is an oxidising agent (3) It is a sterilising agent (4) It dissolves the impurities of water
Last Answer : (2) It is an oxidising agent Explanation: Potassium permanganate is a point-of-entry water treatment method that oxidizes dissolved iron, mancianese, and hydrogen sulfide into solid particles that are filtered ... to control iron bacteria growth in wells. It is an oxidant, but a poor disinfectant.
Description : Potassium Permanganate is used for purifying drinking water, because - (1) it dissolves the impurities of water (2) It is a sterilizing agent (3) It is an oxidising agent (4) It is a reducing agent
Last Answer : (3) It is an oxidising agent Explanation: Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
Description : The blue colour of water in the sea is due to – (1) absorption of other colours except blue by water molecules (2) scattering of blue light by water molecules (3) reflection of blue light by impurities in sea water (4) reflection of blue sky by sea water
Last Answer : (1) absorption of other colours except blue by water molecules Explanation: Almost all sunlight that enters the ocean is absorbed, except very close to the coast. The red, yellow, and green ... to the absorption and scattering of light. The blue wavelengths of light are scattered, similar to the
Description : Sweetening of petroleum product means the removal of (A) Sulphur & its compounds (B) Water (C) Organic impurities (D) Wax
Last Answer : (A) Sulphur & its compounds
Description : Blowdown in a cooling tower (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities (B) Increases the scale forming tendencies of water (C) Is undesirable (D) All (A), (B) & (C)
Last Answer : (A) Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Description : When domestic sewage mixes with river water (a) small animals like rats will die after drinking river water (b) the increased microbial activity releases micronutrients such as iron (c) the increased ... (d) the river water is still suitable for drinking as impurities are only about 0.1%.
Last Answer : (c) the increased microbial activity uses up dissolved oxygen
Description : Presence of dissolved impurities of __________ is responsible for the red brownish color of water. (A) Carbonates (B) Bi-carbonates (C) Iron & manganese (D) Arsenic
Last Answer : (C) Iron & manganese
Description : Inorganic impurities causing water pollution is (A) Fats (B) Carbohydrates (C) Salts of metals (D) Protein
Last Answer : (C) Salts of metals
Description : Most widely and commonly used coagulant for the removal of suspended impurities in water is (A) Bleaching powder (B) Slaked lime (C) Alum (D) Copper sulphate
Last Answer : (C) Alum
Description : Very fine suspended and colloidal impurities are removed from water by a process called (A) Sedimentation (B) Coagulation (C) Disinfection (D) Softening
Last Answer : (B) Coagulation
Description : The most widely used coagulant for removing suspended impurities from water is (A) Bleaching powder (B) Chlorine (C) Calcium sulphate (D) Alum
Last Answer : (D) Alum
Description : Hydrazine is used in water treatment for the removal of (A) Colloidal impurities (B) Dissolved oxygen (C) Turbidity (D) Chlorinous taste
Last Answer : (B) Dissolved oxygen
Description : Which of the following impurities in feed water for high pressure boiler is the most detrimental? (A) Silica (B) Dissolved oxygen (C) Suspended salt (D) Dissolved salt
Last Answer : (A) Silica
Description : Surface water may (A) Contain large amount of impurities (B) Be contaminated by impurities (C) Contain disease producing bacterias (D) All the above
Last Answer : (D) All the above
Description : What are some of the common impurities in water?
Last Answer : Water contains many impurities such as mud, sand, Bacteria, mineral salt and remains of dead plant and animals.
Description : Potassium Permanganate is used for purifying drinking water, because_________ (1) It is a reducing agent (2) It is an oxidising agent (3) It is a sterilising agent (4) It dissolves the impurities of water
Last Answer : It is an oxidising agent
Description : The blue colour of water in the sea is due to (1) absorption of other colours except blue by water molecules (2) scattering of blue light by water molecules (3) reflection of blue light by impurities in sea water (4) reflection of blue sky by sea water
Last Answer : absorption of other colours except blue by water molecules
Description : 7. Write 10 lines on the usefulness of microorganisms in our lives. -Science
Last Answer : Uses of microorganisms are listed below They are helpful in cleaning up of the environment. For example, the organic wastes (vegetable peels, remains of animals, faeces, etc.) are broken ... can be used to degrade the harmful and smelly substances and thereby clean up the environment.
Description : 6. Name the microorganisms which can fix atmospheric nitrogen in the soil. -Science
Last Answer : Rhizobium is the answer
Description : 5. What are the major groups of microorganisms? -Science
Last Answer : Major group of microorganisms are as follows Bacteria Fungi Protozoans Algae Viruses
Description : 4. Can microorganisms be seen with the naked eye? If not, how can they be seen? -Science
Last Answer : Microorganisms cannot be seen by the naked eye because they are very small. They can be seen by using a microscope.
Description : Write a short paragraph on the harms caused by microorganisms. -Biology
Last Answer : Microorganisms are harmful to us in many ways. For example, microorganisms, called pathogens cause disease in humans, plants and animals. Pathogens or germs enter a healthy body through air, ... poisonous causing serious illness and even death. This food-borne illness is called food poisoning.
Description : Write 10 lines on the usefulness of microorganisms in our lives. -Biology
Last Answer : Microorganisms are useful to us in many ways. For example, Bacteria like Lactobacillus convert milk into curd. Bacteria are also involved in the making of cheese. Acetobacter aceti is used ... Some microorganisms are taken as probiotics, that are believed to provide health benefits when consumed.
Description : Name the microorganisms which can fix atmospheric nitrogen in the soil. -Biology
Last Answer : Rhizobium, Clostridium and Azotobacter.
Description : role of microorganisms in environment cleaning and sewage treatment -Biology
Last Answer : answer:
Description : How many types of microorganisms ?
Last Answer : 3 types of microorganisms.
Description : Why are microorganisms called protozoa ?
Last Answer : It is thought that life began at the beginning of creation from microorganisms. That is why microorganisms are also called protozoa.
Last Answer : The microorganisms that cause diseases are called pathogens
Description : The soil pollutants that affects the food chain and food web by killing microorganisms and plants are:
Last Answer : The soil pollutants that affects the food chain and food web by killing microorganisms and plants ... . Agricultural wastes C. Pesticides D. Pathogens
Description : Where do certain symboitic microorganisms normally occur in human body
Last Answer : Where do certain symboitic microorganisms normally occur in human body A. Caecum B. Oral lining and ... C. Vermiform appendix and rectum D. Duodenum
Description : What is the Describe the conditions which promote growth of microorganisms?
Last Answer : Need answer
Description : What is the bean shaped organ above that filters out microorganisms and foreign materials taken up by lymphocytes?
Last Answer : The answer is: D) lymph node.