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Life Processes Test - 69

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Life Processes Test - 69
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  • Question 1
    1 / -0
    All of the following is true about the digestive system, except
    Solution
    The saliva contains an enzyme called salivary amylase which initiates breaking down of starch into maltose. The complete digestion of carbohydrate occurs in small intestine by pancreatic amylase. The activity of both of these enzymes is affected by pH. Salivary amylase requires pH of 6.5 to 7 to function while the enzymes in small intestines require pH around 7.5 for functioning well. 
    So, option D is the correct answer. 
  • Question 2
    1 / -0
    Which of the following organ systems transports materials such as nutrients, oxygen and hormones to body cells and transports carbon dioxide and various waste products away from cells?
    Solution
      • The digestive system includes the alimentary canal and associated glands to carry out the digestion of food and release the energy stored in these food substances. 
      • The respiratory system is responsible for breathing and the exchange of respiratory gases. 
      • The circulatory system serves many duties, such as transportation of gases, nutrients, hormones, and waste products across the body. 
      • The endocrine system includes endocrine glands and maintains the homeostasis of the body through hormonal actions. 
      • The nervous system serves in the reception of sensory input followed by their integration in the brain and spinal cord and generation of motor output to produce a response.  

      So, the correct answer is option C.
    • Question 3
      1 / -0
      In humans, which structure receives blood from the lungs?
      Solution

      The pulmonary veins are blood vessels that carry oxygenated blood from the lungs and drain into the left atrium of the heart. There are in total four pulmonary veins, two from each lung. In this way, they play an important role in respiration because they carry oxygenated blood from the alveolar of the lungs and bring it back to the heart. 

      So, the correct answer is option C.

    • Question 4
      1 / -0
      The chemical digestion of food starts in the:
      Solution
      Chemical digestion of food starts in the mouth. The mouth has salivary glands that secrete an enzyme called amylase. This enzyme acts on complex carbohydrates present in the food and converts them into simpler forms.
    • Question 5
      1 / -0
      Which of the following structures would be expected to contain oxygen-rich blood? 
      I. Pulmonary artery
      II. Pulmonary vein
      Ill. Superior vena cava 
      Solution
      I. Pulmonary artery carries deoxygenated blood from the right ventricle of the heart to the lungs.
      II. Pulmonary vein carries oxygenated blood from the lungs to the left atrium of the heart.
      III. Superior vena cava collects deoxygenated blood from different parts of the body and carries it to the right atrium of the heart.
      So, the correct answer is pulmonary vein i.e. II only.
    • Question 6
      1 / -0
      Which of the following removes debris from cells?
      Solution
      The lymphatic system can be compared with "hazardous waste disposal" because it transports waste products out of the body. These include, for example, proteins, metabolic breakdown products, inflammatory products or fat from the abdominal cavity. The lymphatic system runs alongside the blood vessels and covers our entire body like a net. Lymph fluid normally flows through the network of lymph vessels that connect to a group of lymph nodes. The nodes act as a filter, destroying or trapping anything harmful that the body doesn’t need. The lymph nodes contain white blood cells (lymphocytes), which attack and break down bacteria, viruses, damaged cells or cancer cells. Waste products and the destroyed bacteria are then carried in the lymph fluid back into the bloodstream and are removed from the body with other body waste.

      So, the correct answer is 'Lymph '.
    • Question 7
      1 / -0
      The blood pressure in humans is greater at the feet than at the brain because
      Solution
      In humans, the height of the blood column is concentrated more at the feet rather than at the brain. This causes more force to be applied to push the blood black to the heart against the gravity due to the height column. The pressure at the brain is less due to less distance and force required to carry the blood back to the heart. 
      Thus, the correct answer is option C. 
    • Question 8
      1 / -0
      Which of the following option consists only of heterotrophs? 
      Solution
      A. Cactus, milkweed, maple tree are plants i.e. they are producers.
      B. Bacteria and fungi are the decomposers.
      C. Grass is the autotroph or producer and mouse and hawk are heterotrophs.
      D. Squirrel, ox, tadpole are heterotrophs as they can't prepare own food and depend upon autotrophs.
      E. Mushroom and moss are autotrophs and lady bug is a heterotroph.
      So, the correct answer is option D- 'Squirrel, ox and tadpole'.
    • Question 9
      1 / -0
      Nutrition is the process of 
      Solution
      • Nutrition is the process of obtaining food.
      • Utilising food is called respiration, which also generates energy.
      • Cooking food is not a part of nutrition as no other species but human beings cook food and yet every other organism has nutrition as a life process.
      So the correct answer is 'Obtaining food '.
    • Question 10
      1 / -0
      Which of the following molecule enters into the lymph from intestine?
      Solution
      • Chyle is the liquid form of chyme that enters lymph vessels from the small intestine. It is rich in fats, these fats along with lymph often appear as milk. The fat molecules from the intestine will make their way into the lymph.
      • Glycerols also called as glycerine is a colorless, odorless substance. It is found as an intermediate in metabolic pathways.
      • Plasma protein is the proteins that make-up blood plasma. They help in maintaining osmotic pressure, clotting, and transport of certain lipids, enzymes and hormones.
      So the correct option is "Fat molecules".
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