Haemophilia is a genetic disorder which leads to
- Adecrease in haemoglobin level
- Brheumatic heart disease
- Cdecrease in WBC
- Dnon-clotting of bloodCorrect
Explanation
Haemophilia is a hereditary genetic disorder that impairs the bodys ability to control blood clotting. It is caused by a deficiency or absence of specific clotting factors, which are proteins in the blood needed to stop bleeding. Consequently, even a minor injury can lead to prolonged bleeding because the blood fails to clot normally. This makes option D the correct answer. It does not primarily affect hemoglobin levels, white blood cells, or cause rheumatic heart disease.

Related questions
More UPSC Prelims practice from the same subject and topic.
- Prelims 1998GS1science-and-technology
A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?
- Prelims 1998GS1science-and-technology
Match List I with List II and select the correct answer using the codes given below the lists: List I (Disease) (Organism) I. Malaria A) Fungi II. Poliomyelitis B) Bacteria III. Tuberculosis C) Virus …
- Prelims 1998GS1science-and-technology
A ball is dropped from the top of a high building with a constant acceleration of 9.8 m/s². What will be its velocity after 3 seconds?
- Prelims 1998GS1science-and-technology
Which one of the following types of micro-organisms is most widely used in industries?
- Prelims 1998GS1science-and-technology
Match the names of outstanding Indian scientists given in List I with area of their specialised work given in List II and select the correct answer using the codes given below the lists: List I List I…
- Prelims 1998GS1science-and-technology
Match List I with List II and select the correct answer using the codes given below the lists: List I List II I. Fruit A) Ovule II. Seed B) Leaf III. Wood C) Stem IV. Starch D) Ovary Codes: