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016. What is the purpose of ORS, which is commonly given to patients suffering from diarrhoea? a. t decreases intestinal motility and thereby cures diarrhoea. b.It helps the patient in getting sleep. c. It helps in replenishing salts and water lost from the body. d. t helps in revitalizing energy in the patient.
Answer: c Explanation: Diarrhoea may be caused by an infection, food poisoning or mon in India, particularly among children. Under severe conditions it can be fatal. This is because of the excessive loss of water and salts from the body. Diarrhoea should not be neglected. Even before a doctor is consulted the patient should be given plenty of boiled and cooled water with a pinch of salt and sugar dissolved in it. This is called Oral Rehydration Solution (ORS)
017. In herbivores, rumen helps in the digestion of a. Carbohydrates Proteins Cellulose Pectin c.
Answer: c Explanation: Grass is rich in cellulose, a type of carbohydrate. Many animals, including humans, cannot digest cellulose. Ruminants have a large sac-like structure called rumen between the oesophagus and the small intestine. The cellulose of the food is digested here by the action of certain bacteria (rumen does not secrete any digestive enzyme) which are not present in humans.
Q18. Pseudopodia in amoeba are used for a. Digestion b. Capture of food C. Blood circulation d. Attacking an enemy
Answer: b Explanation: Amoeba is a microscopic single-celled organism found in pond water. Amoeba has a cell membrane, a nucleus and many small bubble-like vacuoles in its cytoplasm. Amoeba pushes out one, or more finger-like projections, called pseudopodia or false feet for movement and capture of food. Amoeba feeds on some microscopic organisms. When it senses food, it pushes out pseudopodia around the food particle and engulfs it. The food becomes trapped in a food vacuole. Digestive juices are secreted into the food vacuole. They act on the food and break it down into simpler substances. Gradually the digested food is absorbed
Q19. What is the purpose of selective breeding? a. To get female offsprings only. b. To get male offsprings only. c. To get high quality offsprings only. d. To save time in breeding activity.
Answer: c Explanation: Selective breeding is the process of selecting the parent animals based on their performance so that only high quality offsprings are born.
Q20. Arrange the following steps in wool processing as per the normal order of production: 1.Scouring 2. Shearing 3. Dyeing 4. Sorting Choose the correct code a. b.2-1-4-3 C. d. 1-2-4-3 2-1-3-4 2-4-1-3
Answer: b Explanation: Following are the steps in wool processing A. Shearing- The fleece of the sheep along with a thin layer of skin is removed B. Scouring- The sheared skin with hair is thoroughly washed in tanks to C. Sorting- The hairy skin is sent to a factory where hair of different textures D. Scouring (to remove burr) - The fibres are scoured again and dried. This is E. Dyeing- The fibres can be dyed in various colours, as the natural fleece of F. Combing- The fibres are straightened, combed and rolled into yarn. The from its body remove grease, dust and dirt. are separated or sorted. the wool ready to be drawn into fibres. sheep and goats is black, brown or white. longer fibres are made into wool for sweaters and the shorter fibres are spun and woven into woollen cloth
Q21. Wool sorters can suffer from which occupational disease? a. Anthrax Tuberculosis c. Diarrhoea d. Silicosis d. Siicosis
Answer: a Explanation: Wool sorter's job is risky as sometimes they get infected by a bacterium, anthrax, which causes a fatal blood disease called sorter's disease. Such risks faced by workers in any industry are called occupational hazards.
Answer: c Explanation: Self-explanatory.
Q24. Clinical thermometer measures temperature from 1 to 100 Celsius 1 to 37 Celsius 32 to 37 Celsius 37 to 100% Celsius a. C.
Answer: b Explanation: When taken out from the mouth the mercury level does not rise or all. The kink prevents the mercury level from falling on its own
026. The process by which heat is transferred from the hotter end to the colder end of an object is known as? a. b.Conduction c. Radiation d. Advection Convection
Answer: b Explanation: The heat flows from a body at a higher temperature to a body at a lower temperature. There are three ways in which heat can flow from one object to another. These are conduction, convection and radiation. In solids, generally, the heat is transferred by conduction. In liquids and gases the heat is transferred by convection. No medium is required for transfer of heat by radiation.
Q28. Transfer of heat from one place to another by the movement of fluids is known as a. Convection b.Conduction c. Radiation d. Advection
Q29. Transfer of heat without the help of any medium occurs in case of Convection b.Conduction c. Radiation d. Advection
030. Why do we wear dark-coloured clothes in winter and light-coloured clothes in summer? a. Dark-coloured clothes protect us from cold while light-coloured clothes protect us from heat. b. Dark clothes trap air inside them while light-coloured clothes don't. c. Warm clothes prevent air from entering inside while as light-coloured clothes allow the air to pass through them. d. Dark coloured clothes absorb radiation better than the light-coloured objects.
Answer:d Explanation: Any dark-coloured object absorbs radiation better than a light- coloured body. On the other hand Woollen clothes keep us warm during winters because wool is a poor conductor of heat and it has air trapped in between the fibres.