Recently, I've provided answers to questions about the meaning of plain English words in a biological context.
Questions about the etymology of biological terms are decidedly on-topic, but the above questions do not deal with scientific jargon. Rather, they ask about the meaning of non-scientific words and phrases in the context of literature or science communication pieces. Of the linked questions, each is sufficiently detailed and the askers provide statements of preliminary research (therefore satisfying the minimal requirements for a
homework question). However, my gut feeling is that such questions are off-topic because they do not directly relate to biological concepts, mechanisms, or techniques.
On the other hand, it is likely the case that the askers are not native English speakers. Answering trivial questions about the interpretation of idioms and figurative language in biological texts is consistent with the popular view that we should encourage users to participate in Biology.SE regardless of their comfort with English, re: this meta post --
I firmly believe we should be encouraging non-native English speakers to participate and use English to the best of their abilities.