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Life Processes Test - 49

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Life Processes Test - 49
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  • Question 1
    1 / -0
    Excretion is removal of-
    Solution

  • Question 2
    1 / -0
    Large intestine present in humans mainly carries out:
    Solution
    The main function of the large intestine is the absorption of water from the undigested food. This is done to minimize the loss of water from the body.
  • Question 3
    1 / -0
    The diagram shows organs of the human excretory system labelled as A, B, C and D. Identify the label of the organ through which urine leaves the urinary bladder.

    Solution
      The organ labelled A is the kidney. From the kidney, the urine moves into the ureter, labelled as B in the figure. Through the ureters, the urine is collected in the urinary bladder. The urinary bladder, labelled C, is the organ for the temporary storage of urine. The urethra, labelled D, is the duct, that carries urine from the urinary bladder to the outside.
      So, the correct answer is option D.
    • Question 4
      1 / -0
      Select the correct statement.
      Solution
      Heterotrophs are the organism which does not prepare their own food. They depend on autotrophs for their nutrition. They derive the nutrition from the host and used to construct the proteins for their body.
      So, the correct answer is option A. 
    • Question 5
      1 / -0
      Which part of the body is common between digestive and respiratory systems?
      Solution
      The pharynx connects the mouth to the oesophagus and the larynx in the throat. At the end of the pharynx, a flap-like structure called epiglottis is present. The flap moves to one side for food (towards the oesophagus) and the other side as one breathes (towards the larynx). 
    • Question 6
      1 / -0
      Which of the following statement(s) is (are) true about respiration?
      Solution
      The percentage of carbon dioxide transported by hemoglobin is lesser than the carbon dioxide transported in dissolved state by plasma. The alveoli of the lungs increase the surface area for an efficient gaseous exchange between blood and alveolar air. The alveoli have thin walls made up of a single layer of an epidermis which allows easy exchange of gases.
      So, the correct answer is option D.
    • Question 7
      1 / -0
      Blood transports:
      Solution
      • The circulatory system is composed of the heart, blood, and blood vessels.
      • Blood is the fluid connective tissue that helps in the transportation of food, ions, salts, hormones, and gases in the body. 
      • The food that is digested in the digestive tract is absorbed by the intestinal walls of the small intestine and diffused into the blood. 
      • This food is carried to different tissues of the body for absorption.
      • The waste substances and ions generated by the cells of the tissues are excreted into the blood. Also, the blood carries oxygen.
      So, the correct answer is option D. 
    • Question 8
      1 / -0
      Organisms that synthesize their own food are called as
      Solution
      The organisms which synthesize their own food from co2, chlorophyll and sunlight through photosynthesis are known as autotrophs. And their mode of nutrition is known as autotrophic nutrition. So the correct answer is (c)
    • Question 9
      1 / -0
      The chief function of lymph nodes in mammalian body is to
      Solution
      • Lymph nodes are the oval-shaped lymphatic organ scattered throughout the body and play an important role in the body's defense mechanisms. 
      • It is majorly composed of WBC and devoid of RBC. 
      • Lymph nodes do not perform the endocrine function.
      So, the correct answer is option B.
    • Question 10
      1 / -0
      The mechanism of urine formation in nephrons involves:
      Solution
      • The mechanism of filtration of blood (1100-1200 ml) by the kidneys (nephrons) per minute is called ultrafiltration. 
      • Reproduction is the biological process by which organisms produce young ones similar to themselves.
      • Diffusion is the movement of substances from the region of the higher concentration to the area of lower concentration.
      • Osmosis is the movement of solvent or water molecules from the region of their higher diffusion pressure to the region of their lower diffusion pressure through a semipermeable membrane.
      So, the correct answer is option A. 
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