Looking for a book I read in the early 1980s. A large colony ship is heading to another planet.
All I can remember is a couple quotes and situations:
The captain (or some authority figure on the ship) says "there are two tough guys on this ship, and I'm both of them"
One of the passengers is a very sexy sixteen-year old - somebody wonders "If she's like this at sixteen, what could the future hold?"
They're exploring a planet and a plant seems to speak to one of the scientists. "Intellegent?!" he marvels. The plant eats him. It's not an intellegent life-form, it turns out it only mimics sounds that it hears.
Not much to go on, I admit. I read it in the early 80s, and if I remember right it was a fairly long book - maybe 400 or 500 pages.