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Life Processes Test - 25

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Life Processes Test - 25
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  • Question 1
    1 / -0
    The numbers of lobes in right and left lungs are ___________.
    Solution
    The lungs are divided into the right lung and left lung. The right lung has three lobes, whereas the left lung has only two lobes. However, all the lobes help in the exchange of gases and aid breathing. The nose leads into the trachea, which then splits into two bronchi, which in turn branch into various bronchioles.
    Hence, the correct option is (C).
  • Question 2
    1 / -0

    Covering of lungs is called __________.

    Solution
    The covering of the lung is called the pleural membrane. Pleura is one of the membranes of the lungs. This membrane has a thin covering to secures the lungs. It is made up of two kinds of layers of tissue that are isolated by a small amount of fluid. There are two types of pleura which are called visceral (inner layer of lungs) and parietal pleurae(Outer layer of lungs). The visceral pleurae surround the lungs and parietal pleurae line the inner wall and this acts as a lubricant among the two membranes.
    Hence, the correct option is (C).
  • Question 3
    1 / -0
    Exchange of gases in plants takes place through 
    Solution
    Gaseous exchange is necessary for plants for the purpose of photosynthesis and respiration. Carbon dioxide is necessary for photosynthesis, which is taken in the form of air. The oxygen which is produced during this process is released through these pores. For this purpose, stomata are present on leaves, stems, and other organs. Stomata are the pores present on the epidermal layer of the plant.
    Hence, the correct option is (A).
  • Question 4
    1 / -0

    Sequential processes during breathing or external respiration are

    Solution
    The process of breathing, or respiration, is divided into two distinct phases. The first phase is called inspiration, or inhaling. When the lungs inhale, the diaphragm contracts and pulls downward. At the same time, the muscles between the ribs contract and pull upward. This increases the size of the thoracic cavity and decreases the pressure inside. As a result, air rushes in and fills the lungs.
    The second phase is called expiration, or exhaling. When the lungs exhale, the diaphragm relaxes, and the volume of the thoracic cavity decreases, while the pressure within it increases. As a result, the lungs contract and air is forced out.
    Hence, the correct option is (A).
  • Question 5
    1 / -0
    In a muscle cell, what are the end products of respiration obtained during lack of oxygen?
    Solution
    The end products of anaerobic respiration are Lactic acid or ethanol and ATP molecules. Anaerobic respiration takes place in the absence of oxygen and is seen in lower animals. During the process of Anaerobic Respiration in prokaryotes, there is a breakdown of glucose to produce energy for cellular activities.
    Hence, the correct option is (C).
  • Question 6
    1 / -0

    At the time of inhalation, the diaphragm _________.

    Solution
    The diaphragm does most of the work during the inhalation part. During inhalation, the diaphragm contracts so that the lungs can expand into the extra space and let in as much air as is necessary. Muscles in between the ribs, known as intercostal muscles, raise the rib cage in order to help the diaphragm let enough air into the lungs.
    Hence, the correct option is (B).
  • Question 7
    1 / -0
    Which of the following statements is/are true about haemoglobin?
    Solution
    Haemoglobin is an iron-rich protein in red blood cells. Oxygen entering the lungs attaches to the haemoglobin in the blood, which carries it to the tissues in the body
    Hence, the correct option is (D).
  • Question 8
    1 / -0
    Epiglottis is a flap of tissue present near the ___________.
    Solution
    The epiglottis is a leaf-shaped flap of cartilage located behind the tongue, at the top of the larynx, or voice box. The main function of the epiglottis is to seal off the windpipe during eating, so that food is not accidentally inhaled.
    Hence, the correct option is (A).
  • Question 9
    1 / -0
    The exchange of gases in lungs takes place by _________.
    Solution
    Simple diffusion is the movement of solutes (gas or ions) from an area of high concentration to an area of low concentration. Gases diffuse across the systemic capillary membrane and the cell membranes of the target tissue. Carbon dioxide diffuses from systemic tissues to lungs, and oxygen diffuses from lungs to systemic tissues.
    Hence, the correct option is (B).
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