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A stem of a pea plant grows from 5 cm to 8 cm in 6 days. What is the average daily growth rate of the stem, in cm per day?

easy 1 mark Class 11 · Biology · Plant Growth and Development
Answer
0.5 cm per day

The correct answer is 0.5 cm per day — Thus the stem grows on average 0.5 cm each day.

Step-by-step solution

  1. The stem length at start = 5 cm and at end = 8 cm.
  2. Growth over 6 days = 8 cm – 5 cm = 3 cm.
  3. Average daily growth rate = total growth ÷ number of days = 3 cm ÷ 6 days.
  4. Thus the stem grows on average 0.5 cm each day.
Common mistake: Dividing by 3 instead of 6

Concept tested: Stem elongation rate

Published · How this solution was prepared and checked

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