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Disease-causing agents are known as______
  • a)
    Leucocytes
  • b)
    Antigens
  • c)
    Antibodies
  • d)
    Pathogens
Correct answer is option 'D'. Can you explain this answer?
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Disease-causing agents are known as______a)Leucocytesb)Antigensc)Antib...
A pathogen is an organism that causes disease. Your body is naturally full of microbes. However, these microbes only cause a problem if your immune system is weakened or if they manage to enter a normally sterile part of your body. Pathogens are different and can cause disease upon entering the body.
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Since the dawn of civilization mankind has always been plagued by some or the other form of disease. The number of lives accounted for by each disease has, through the decades, varied continually, though none of them can be singled out as the leading cause of death, collectively they are the leading cause of deaths. The origin or evolution of diseases has never been too clearcut a phenomenon, though some wishful dreamers even attribute it to Pandoras box of troubles. A survey of the five leading causes of deaths during a period from the early 1900s to the mid 1900s shows a distinct and significant trend. In the early 1900s these causes in order of number of deaths caused were:i. Tuberculosis,ii. Pneumonia,iii. Intestinal diseases,iv. Heart diseases,v. and Cerebral haemorrhage and thrombosis.A decade later the only change was that heart disease had moved from fourth to fifth place, tuberculosis now being second, and pneumonia third. Toward the later part of this period, however, the list had changed profoundly.Heart diseases were far out in front; cancer, which had come up from eighth place, was second; and cerebral haemorrhage and thrombosis, third. Fatal accidents, which had been well down the list, were now fourth, and nephritis was fifth. All of these are, of course, composites rather than single diseases, and it is significant that, except for accidents, they are characteristic of the advanced rather than the early or middle years of life.Q. Which one of the following trends is least indicated in the passage?

Since the dawn of civilization mankind has always been plagued by some or the other form of disease. The number of lives accounted for by each disease has, through the decades, varied continually, though none of them can be singled out as the leading cause of death, collectively they are the leading cause of deaths. The origin or evolution of diseases has never been too clearcut a phenomenon, though some wishful dreamers even attribute it to Pandoras box of troubles. A survey of the five leading causes of deaths during a period from the early 1900s to the mid 1900s shows a distinct and significant trend. In the early 1900s these causes in order of number of deaths caused were:i. Tuberculosis,ii. Pneumonia,iii. Intestinal diseases,iv. Heart diseases,v. and Cerebral haemorrhage and thrombosis.A decade later the only change was that heart disease had moved from fourth to fifth place, tuberculosis now being second, and pneumonia third. Toward the later part of this period, however, the list had changed profoundly.Heart diseases were far out in front; cancer, which had come up from eighth place, was second; and cerebral haemorrhage and thrombosis, third. Fatal accidents, which had been well down the list, were now fourth, and nephritis was fifth. All of these are, of course, composites rather than single diseases, and it is significant that, except for accidents, they are characteristic of the advanced rather than the early or middle years of life.Q. The word wishful, given in the passage means

Disease-causing agents are known as______a)Leucocytesb)Antigensc)Antibodiesd)PathogensCorrect answer is option 'D'. Can you explain this answer?
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