जीव विज्ञान – Zoology – Zoology MCQ

जीव विज्ञान – Zoology: प्रश्न र उत्तर

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सही: ० / ०

61. Which of the following best describes the role of ‘synapses’ in neuronal communication?

    कA gap between adjacent neurons for direct electrical transmission खThe site where neurotransmitters are synthesized within a neuron गA junction between a neuron and its target cell where signals are transmitted chemically घThe area of the neuron responsible for receiving incoming signals
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    छलफल / प्रश्न उत्तरमा गल्ती छ

    पठाउनुहोस्

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62. Which of the following cell types is primarily responsible for initiating the inflammatory response upon tissue injury?

    कLymphocytes खNeutrophils गErythrocytes घOsteoclasts
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63. The phenomenon of ‘positive feedback’ is most prominently observed during which physiological process?

    कBlood clotting खRegulation of blood glucose levels गMenstrual cycle घDigestion of fats
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    छलफल / प्रश्न उत्तरमा गल्ती छ

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64. The process of parturition (childbirth) is stimulated by an increase in the levels of which hormone during pregnancy?

    कEstrogen खProgesterone गOxytocin घTestosterone
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

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65. Which of the following is a key characteristic differentiating prokaryotic cells (like bacteria) from eukaryotic cells (like those found in animals and plants)?

    कA. Prokaryotic cells contain membrane-bound organelles. खB. Eukaryotic cells possess a nucleus housing their genetic material. गC. Prokaryotic cells are generally larger than eukaryotic cells. घD. Eukaryotic cells lack the ability to perform photosynthesis.
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66. The coordinated movement of cilia in the respiratory tract primarily serves which purpose?

    कA. To facilitate gas exchange between air and blood. खB. To filter inhaled particles and mucus from the airways. गC. To amplify sound vibrations for hearing. घD. To maintain a constant body temperature.
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67. The process of exocytosis, where vesicles fuse with the plasma membrane releasing their contents into the extracellular space, is primarily involved in:

    कA. Cell division and DNA replication. खB. Waste removal from cells and secretion of hormones. गC. Maintaining cell shape and structural integrity. घD. Cellular respiration and energy production.
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68. Which of the following best describes the role of the sinoatrial node (SA node) in the mammalian heart? (a) It receives signals from the atria, initiating ventricular contraction. (b) It is the primary pacemaker of the heart, generating electrical impulses that trigger each heartbeat. (c) It filters blood leaving the ventricles before it enters the pulmonary artery. (d) It regulates blood pressure by controlling the speed of ventricular filling.

    क(a) It receives signals from the atria, initiating ventricular contraction. ख(b) It is the primary pacemaker of the heart, generating electrical impulses that trigger each heartbeat. ग(c) It filters blood leaving the ventricles before it enters the pulmonary artery. घ(d) It regulates blood pressure by controlling the speed of ventricular filling.
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69. The primary function of the mitochondria within a cell is: (a) Protein synthesis. (b) DNA replication. (c) Cellular respiration - generating ATP. (d) Waste disposal.

    क(a) Protein synthesis. ख(b) DNA replication. ग(c) Cellular respiration - generating ATP. घ(d) Waste disposal.
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70. Which of the following statements best describes the function of goblet cells? (a) They transport oxygen throughout the body. (b) They secrete mucus to lubricate and protect the lining of various organs like the stomach and intestine. (c) They produce digestive enzymes that break down food. (d) They are responsible for filtering blood in the liver.

    क(a) They transport oxygen throughout the body. ख(b) They secrete mucus to lubricate and protect the lining of various organs like the stomach and intestine. ग(c) They produce digestive enzymes that break down food. घ(d) They are responsible for filtering blood in the liver.
    💬 टिप्पणी / गल्ती रिपोर्ट (०)

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    टिप्पणी जाँचपछि मात्र देखिन्छ।