Show:
Shapes
Landforms & Bodies of Water
Money
Grammar
Fruits/Vegetables
100
A plane with four equal straight sides and right angles
What is a square
100
A large body of salt water that surrounds a continent
What is an ocean
100
The value of a penny
What is one cent
100
A word used to identify a person, place, or thing
What is a noun
100

This is the cheapest fruit you can buy.  They can be slippery....

Banana

200
A plane figure with three straight sides and three angles
What is a triangle
200
A very tall high, natural place on earth, that is taller than a hill
What is a mountain
200
The value of a quarter
What is 25 cents
200
A word used to describe an action, state, or occurrence
What is a verb
200

Gala, Fuji, and Granny Smith 

Apples 

300
A plane figure with five straight sides and five angles
What is a pentagon
300
A body of land that is surrounded by water on three sides
What is a peninsula
300
The value of 2 dimes and 4 nickels
What is 40 cents
300
A punctuation mark used to indicate a pause between parts of a sentence
What is a comma
300

It's green and tastes delicious with a little salt.  

Avocado 

400
A plane figure with eight straight sides and eight angles
What is an octagon
400
A low place between mountains
What is a valley
400
The value of 4 quarters, 1 dime, 2 nickels, and 3 pennies
What is 1 dollar and 23 cents
400
A word or phrase added to a noun to describe it
What is an adjective
400

Little Cuties are a kind of these. They're not oranges. 

Clementines 

500
A plane figure with ten straight sides and angles
What is a decagon
500
A large, flat area of land that is higher than the surrounding ground
What is a plateau
500
The value of one 5 dollar bill, one 1 dollar bill, 4 quarters, a dime, and 15 pennies
What is 7 dollars and 25 cents
500
A punctuation mark used to indicate either possession or the omission of letters
What is an apostrophe
500

These are grown on a vine and used to make wine or juice.  They're also delicious on their own. 

Grapes