Logical Reasoning - Statement and Conclusion - Discussion

In each question below is given a statement followed by two conclusions numbered I and II. You have to assume everything in the statement to be true, then consider the two conclusions together and decide which of them logically follows beyond a reasonable doubt from the information given in the statement.

Give answer:

  • (A) If only conclusion I follows
  • (B) If only conclusion II follows
  • (C) If either I or II follows
  • (D) If neither I nor II follows and
  • (E) If both I and II follow.


Statements: About 50 per cent of the animal by-products - hair, skin, horns etc. is edible protein. American chemists have developed a method of isolating 45 per cent of this protein. They used an enzyme developed in Japan to break down soya protein.


  1. Americans have not been able to develop enzymes.
  2. Animal by-products protein has the same composition as soya protein.

[A]. Only conclusion I follows
[B]. Only conclusion II follows
[C]. Either I or II follows
[D]. Neither I nor II follows
[E]. Both I and II follow

Answer: Option D


That the American chemists used an enzyme developed in Japan, does not mean that Americans have not been able to develop enzymes. So, I does not follow. Also, nothing about the compositions of animal by products protein and soya protein is mentioned in the statement. So, II also does not follow.

Dipinn said: (Dec 29, 2011)  
As Same enzyme is used to break down the Soya and Animal Protien, this may be because of the similar composition.

Mohamed said: (Aug 25, 2012)  
I agree with dipinn and my answer was choosing choice A.

Shilpi said: (Oct 27, 2013)  
Enzymes are substrate specific, hence composition should be same.

Soham said: (Nov 5, 2014)  
If Americans could develop their own enzymes. Why would they use one made by Japan?

Sridhar said: (Apr 11, 2015)  
There is no need for reinventing the wheel. @Soham.

Prabhanshu said: (Apr 4, 2016)  
The Same enzyme is being used. So the protein must also same.

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