WONDER #111: Why Are Lemons Sour?

Question 1 of 3

Which part of your tongue senses sweet foods?

1. tip
2. back
3. side
4. bottom

Question 2 of 3

Lemons taste sour because they contain what?

1. butter
2. sugar
3. seeds
4. citric acid

Question 3 of 3

Which of the following fruits has the highest concentration of citric acid?

1. orange
2. grapefruit
3. watermelon
4. lime

Check your answers online at https://wonderopolis.org/wonder/Why-Are-Lemons-Sour.