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Human Circulatory and Excretory Systems — Science Questions & Practice

Practise 1 Human Circulatory and Excretory Systems questions from Science for competitive exams such as UPSC, Banking, SSC and Railway. Read the worked questions below, check every answer with an explanation, and track what you get wrong.

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Practice questions on Human Circulatory and Excretory Systems — with answers

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1. How many blood groups are there in the ABO blood group system?

AFour (A, B, AB, O)
BTwo (A, B)
CThree (A, B, O)
DFive

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Answer: B

The ABO blood group system classifies blood into four main types: A, B, AB, and O, based on antigens present on red blood cells.

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