Question

Amit sowed a few seeds of moong dal in the ground. The height of the plant grew to 1.4 cm in the first four days. After that it started growing faster.
Amit measured the height of the plant after every four days and put a dot on the chart. For example if you look at the dot marked on the fourth day, you can see on the left side scale that it is 1.4 cm high.
Now look at the height of each dot in cm and check from the table if he has marked the dots correctly.

Day	Length of the plant (in cm)
0 4 8 12 16 20	0 1.4 5.3 9.5 10.2 10.9

Find out from the growth chart
(a) Between which days did the length of the plant change the most?
(i) 0-4 (ii) 4-8 (iii) 8-12 (iv) 12-16 (v) 16-20
(b) What could be the length of this plant on the 14th day? Guess.
(i) 8.7 cm (ii) 9.9 cm (iii) 10.2 cm (iv) 10.5 cm
(c) Will the plant keep growing all the time? What will be its length on the 100th day? Make a guess!

Answer 1

Yes, he marked the dots correctly.

(a)
Correct: (iii)
From the growth chart, we find that the length of the plant changes the most between the 8th and the 12th day.
Length of plant in first 12 days = 9.5 cm
Length of plant in first 8 days = 5.3 cm
∴ Increase in the length of the plant between 8–12 days = 9.5 cm − 5.3 cm
= 4.2 cm

(b)
Correct: (ii)
The length of the plant on the 12th day = 9.5 cm
The length of the plant on the 16th day = 10.2 cm
So, the possible length of the plant on the 14th day must lie between 9.5 cm and 10.2 cm.
Thus, among the given options, 9.9 cm is the best option.

(c) Disclaimer: The answer may vary from student to student.