Pick the odd one out

1. Trigonometry, Geometry, Cirrus, Calculus
2. Otter, Shark, Dolphin, Sea Lion
3. Delicious, Bartlett, Granny Smith, Royal Gala
4. North America, Australia, Asia, Canada
5. Carnation, Tulip, Tomato, Rose

Answers: 1.Cirrus is a type of cloud not a Maths topic, 2.Shark is a fish not a marine mammal, 3.Bartlett is a type of pear not an apple, 4.Canada is a country not a continent and 5.Tomato is a fruit not a flower.