First let's consider a few sentences 1) A cow is a useful animal. 1') Cows are useful animals.
(In sentence 1) 'a cow' represents all cows in general)
2) A good student is fun to teach. 2') Good students are fun to teach. (In sentence 2) 'a good student' represents all good students in general )
These above four sentences are true for any cow and any good student, i guess because 'cow' and 'student' there are generic nouns.
Now my question is - Suppose the govt has launched a scheme named X and I'm making a sentence like this - 3) "According to this scheme a farmer will get monetary benefits if 'a crop' fails". Vs 4) "According to this scheme a farmer will get monetary benefits if 'crops' fail".
Is there any difference in meaning in the sentence 3) and 4) ? In sentence 3) can I say that 'a crop' here represents all crops in general ?