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://www.wonderopolis.org/wonder/why-are-lemons-sour.