1. Pick the "odd one out" (with reference to crustaceans and molluscs).   Crab   Mussel   Shrimp   Hint Half-n-half Clue   2. The nerve carrying messages from the ear to the brain is the _______ nerve.   optical   olfactory   auditory   Half-n-half Clue   3. The body of an insect comprises three parts, namely the head, body and tail.   True   False   4. Frogs have _______ as their hearing organs.   sensitive feelers   external eardrums   lateral lines   Half-n-half Clue   5. _______ is a unicellular animal.   Spirogyra   Amoeba   Chlamydomonas   Half-n-half Clue   6. A short-sighted person can see a distant object but has difficulty in seeing a near object.   True   False   7. A long-sighted person can see a distant object but has difficulty in seeing a near object.   False   True