useless trivia: What Word Means: A Genus Of Tropical Shrubs?

Questions

Humans are the only primates that do not have ---------- in the palms of their hands.?

If you go blind in one eye you only lose about one ---------- of your vision, but all your sense of depth.?

If you have a tapeworm in your stomach, it will come up while you're asleep to lick the ---------- off your lips.?

If you lock you ---------- while standing long enough, you will pass out.?

If you suffer from---------- , you have three nipples.?