1. The part of the alimentary canal that absorbs water is the _______.   rectum   colon   caecum   Hint Half-n-half Clue   2. Our vision is _______.   monocular   binocular   triocular   Half-n-half Clue   3. The nerve carrying messages from the eye to the brain is the _______ nerve.   olfactory   auditory   optical   Half-n-half Clue   4. Pick the "odd one out" (with reference to crustaceans and molluscs).   Octopus   Crayfish   Oyster   Half-n-half Clue   5. Frogs have _______ as their hearing organs.   sensitive feelers   external eardrums   lateral lines   Half-n-half Clue   6. A bull is angered by the color of a red cloth.   True   False   7. The nerve carrying messages from the tongue to the brain is the _______ nerve.   auditory   gustatory   olfactory   Half-n-half Clue