Question

For an experiment in Botany, two different plants, plant A and plant B were grown under similar laboratory conditions. Their heights were measured at the end of each week for 3 weeks. The results are shown by the following graph.

1. How high was Plant A after (i) 2 weeks (ii) 3 weeks?
2. How high was Plant B after (i) 2 weeks (ii) 3 weeks?
3. How much did Plant A grow during the 3^rd week?
4. How much did Plant B grow from the end of the 2^nd week to the end of the 3^rd week?
5. During which week did Plant A grow most?
6. During which week did Plant B grow least?
7. Were the two plants of the same height during any week shown here? Specify.

Answer 1

1. 
   
   1. After 2 weeks, the height of plant A was 7 cm.
   2. After 3 weeks, the height of plant A was 9 cm.
2. 
   
   1. After 2 weeks, the height of plant B was 7 cm.
   2. After 3 weeks, the height of plant B was 10 cm.
3.  
   1. Growth of plant A during 3^rd week = 9 cm − 7 cm = 2 cm
4. 
   
   1. Growth of plant B from the end of the 2^nd week to the end of the 3^rd week
   2. = 10 cm − 7 cm = 3 cm
5. 
   
   1. Growth of plant A during 1^st week = 2 cm − 0 cm = 2 cm.
   2. Growth of plant A during 2^nd week = 7 cm − 2 cm = 5 cm.
   3. Growth of plant A during 3^rd week = 9 cm − 7 cm = 2 cm
   4. Therefore, plant A grew the most, i.e. 5 cm, during the 2^nd week.
6. 
   
   1. Growth of plant B during 1^st week = 1 cm − 0 cm = 1 cm.
   2. Growth of plant B during 2^nd week = 7 cm − 1 cm = 6 cm.
   3. Growth of plant B during 3^rd week = 10 cm − 7 cm = 3 cm.
   4. Therefore, plant B grew the least, i.e. 1 cm, during the 1^st week.
7. At the end of the 2^nd week, the heights of both plants were same.