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Life Processes Test - 39

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Life Processes Test - 39
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  • Question 1
    1 / -0
    The kidneys are the part of which of following system in human body? 
    Solution
    The kidneys are part of the excretory system in the human body. The kidneys help in removing waste products and excess fluid from the body in form of urine. Thus, option A is the correct answer.

  • Question 2
    1 / -0
    Oxygen is transported through blood mainly by:
    Solution
    • Erythrocytes, also known as red blood cells (RBCs), function to transport Oxygen in the blood. 
    • They do so with the help of Haemoglobin, a respiratory pigment. 
    • The shape and structure of Erythrocytes are ideal for this function. 
    • They lack a nucleus and few other organelles so that maximum space in the cell can be used to accommodate Haemoglobin molecules. 
    • Leucocytes are involved in immune response while Thrombocytes are involved in blood clotting. 
    • Blood plasma does not contribute to O$$_2$$ transport. 
    • Thus, option B is correct.
  • Question 3
    1 / -0
    Respiration involving the use of oxygen to produce energy is called ________.
    Solution
    Aerobic respiration is the process of producing cellular energy involving oxygen. After glycolysis, pyruvate from glucose, the three-carbon molecule of pyruvic acid gets further broken down to give three molecules of carbon dioxide and water. This process takes place in the mitochondria of a cell in the presence of oxygen and energy is released. Plants and animals both undergo this type of respiration.
    Anaerobic respiration involves respiration in absence of oxygen or lack of oxygen.
    Therefore, the correct answer is option D.
  • Question 4
    1 / -0
    Haemoglobin is
    Solution
    (A) Correct answer: A
    (B) Explanation of correct answer

    Haemoglobin is an iron-containing red pigment that is responsible for the transport of oxygen and carbon dioxide in human blood. 
    Haemoglobin is contained in red blood cells and serves as the oxygen carrier in the blood. 
    Haemoglobin contains a haem prosthetic group that has an iron atom at its centre.
    When the iron is bound to oxygen, the haem group is bright red in colour (oxyhaemoglobin), and when it lacks oxygen (deoxygenated form) it is dark red. 
  • Question 5
    1 / -0
    Lymph contains ........... proteins than plasma.
    Solution
    The lymphatic system returns excess interstitial fluid to the blood. Of the fluid that leaves the capillary, about 90 percent is returned. The 10 percent that does not return becomes part of the interstitial fluid that surrounds the tissue cells. It helps in exchange of gasses, nutrients and removes the metabolic waste. It is devoid of RBC. It contains fewer proteins than plasma and lacks RBC.  So, the correct answer is option A.
  • Question 6
    1 / -0
    Gaseous exchange in plants occurs through:
    Solution
    A stomata is a pore, found in the epidermis of leaves, stems and other organs, that is used to control gaseous exchange by diffusion. Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of leaves of many kinds of grass and causes leaves to roll up due to loss of turgor pressure. Chloroplast's main role is to conduct photosynthesis, where the photosynthetic pigment, chlorophyll captures the energy from sunlight. Waxy cuticles help in the preventing water loss.
    So, option B is correct.

  • Question 7
    1 / -0
    Pseudopodia in amoeba helps in:
    Solution
    • Pseudopodia is a temporary cytoplasm-filled projection of a eukaryotic cell membrane or a unicellular protist.
    • Pseudopods may be used for motility, or for ingesting nutrients or other particulate matter. It senses the prey that can then be engulfed; the engulfing pseudopodia are called phagocytosis pseudopodia. Hence, pseudopodia in amoeba help in locomotion, engulfment, and ingestion.
    So, the correct answer is 'all of the above.
  • Question 8
    1 / -0
    In aerobic respiration which of the following is a reactant?
    Solution
    The oxidative breakdown of glucose with the help of atmospheric oxygen is known as aerobic respiration. It involves the complete breakdown of glucose into carbon dioxide and water releasing energy. 
    Thus, the correct answer is option B.

  • Question 9
    1 / -0
    Blood is a ............... tissue.
    Solution
    Blood is a fluid connective tissue. Blood is considered a connective tissue for two basic reasons:- 
    1. Embryologically, it has the same origin (mesodermal) as do the other connective tissue.
    2. Blood connects the body systems together bringing the needed oxygen, nutrients, hormones and other signalling molecules, and removing the wastes.

    So, the correct option is A - 'Connective'.
  • Question 10
    1 / -0
    What are the components of the transport system in human beings? 
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