Cambridge Secondary (7-9). Stage 7. MCE Science. Workbook - Unit 1: Introducing Science - Question 43

Mariam wants to observe the growth of two identical plants, A and B. She gives only plant A 10 cm³ of liquid fertiliser once a week. She gives plants A and B 10 cm³ of water once a day.

Mariam’s friend decides to measure the height of her plant to study its growth. What piece of apparatus should she use?