This quiz application from the Sierra Club offers great insights and helpful information on developing and maintaing earth-friendly gardens. This guide to organic gardening has Q&As that are engaging and entertaining, as well as informative. Sample card: True or False? Carnivorous plants are native only to the tropics. Answer: false. Provided they don?t grow big enough to eat you, carnivorous plants can add a uniquely green bug-reducing element to your garden. These macabre miracles of mother nature lure insects into an inescapable trap, then secrete enzymes that dissolve and digest the hapless bugs. Nearly 600 species exist. A portion of this mobile application's sales proceeds are donated to the Sierra Club for environmental protection causes.