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Life Processes Test - 68

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Life Processes Test - 68
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  • Question 1
    1 / -0
    _______ involves circulation of blood to all parts of the body except lungs.
    Solution
    The course of the blood between the heart and other parts of the body except lungs is called systemic circulation. 
    The circulation of blood between the heart and the lungs is called the pulmonary circulation. 
    So, the correct answer is option C.

  • Question 2
    1 / -0
    Which of the following is responsible for excretion in human?
    Solution

    1. Simple diffusion is the excretory mechanism for unicellular organisms. This process is associated with osmoregulation of cells.
    2. Nephridia is the structure responsible for excretion in invertebrates. they are primarily found in land-based invertebrates like an earthworm. 
    3. Malpighian tubules in a similar way are excretory structures found in Arthropods.
    4. Flame cells are specialized structures found only in freshwater invertebrates.
    5. Nephrons are the microscopic unit of Kidney found in mammals including humans
    Hence, 'Nephrons' is the correct option.
  • Question 3
    1 / -0
    The part labelled as 1 in the given structure of nephron is

    Solution
    The part labelled as 1 is a structure of glomerulus. Blood that is about to be filtered enters a glomerulus, which is a tuft of blood capillaries (the smallest of blood vessels). The glomerulus is nestled inside a cup-like sac located at the end of each nephron, called a glomerular capsule. Glomerular capillaries have small pores in their walls, just like a very fine mesh sieve. .The glomerulus, on the other hand, is sandwiched between two arterioles - afferent arterioles deliver blood to the glomerulus, while efferent arterioles carry it away. 

    So, the correct option is 'Glomerulus'.
  • Question 4
    1 / -0
    Which is not the function of lymph?
    Solution
    Lymph is a tissue fluid that transports lymphocytes, antibodies, carries digested and absorbed fats from intestine. It drains excess tissue fluid from intercellular spaces back into  but, lymph does not transport RBCs. RBCs are transported by blood.
    Therefore, the correct answer is option A.
  • Question 5
    1 / -0
    Which among the following is not a function of the kidney?
    Solution
    • Kidney participates in the homeostasis, regulating acid-base balance, electrolyte concentrations, blood pressure, filtration of blood and excretion of wastes in the form of urine. 
    • An antibody is secreted by a specialized cell called B-cells (lymphocytes) in the human immune system. These cells are not found in the kidney and hence, kidneys do not take part in the production of antibodies. 
    So, the correct answer is option C.
  • Question 6
    1 / -0
    Which of the following systems transports respiratory gases, nutrients and wastes?
    Solution
    The circulatory system is a network consisting of blood, blood vessels and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones and removes unnecessary waste products.
    So, the correct option is 'C'.
  • Question 7
    1 / -0
    Which of the following occurs due to the stomatal opening?
    I. Increased photosynthesis
    II. Increased transpiration
    III.Decreased chlorophyll
    Solution
    When stomatal pore opens, exchange of gases and release of water vapour is increased. This causes photosynthesis and transpiration to increase.
    Chlorophyll doesn't decrease due to opening of stomata. Also increased photosynthesis needs more Chlorophyll.
    So the correct answer is 'I and II only'.
  • Question 8
    1 / -0
    Which of the following organ system takes in food, breaks it down into smaller chemical units, and absorbs the nutrient molecules?
    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 nutrients from digested food are then absorbed in the small intestine of the alimentary canal and carried to different organs via the circulatory system.
    • The primary function of the respiratory system is to allow atmospheric oxygen from the air to enter the blood and carbon dioxide from the blood to exit into the air. 
    • 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 the response. 
    Thus, the correct answer is A.
  • Question 9
    1 / -0
    The site of initial digestion of carbohydrates is

    Solution
    The site of initial digestion of carbohydrates is the mouth which is represented by A in the figure. The salivary glands in the mouth secrete saliva, which helps to moisten the food, and the enzyme salivary amylase, which begins the process of breaking down the polysaccharides in the carbohydrate food after which food is swallowed and passed it down to the esophagus. 
    Thus, the correct answer is option A. 
  • Question 10
    1 / -0
    An enzyme that converts starch to simple sugars is known as ________.
    Solution
    Amylase is an enzyme that breaks down complex starch molecules into simple sugars. Amylase is found in the saliva, present in the mouth. it is also released by the pancreas. Due to the presence of amylase in the saliva, it is said that the digestion process starts from the mouth itself.
    Bile juice acts on fats. HCl is not an enzyme, it is an acid. Pepsin digests proteins.
    So, the correct answer is option A.
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