Question

A student setup an experiment to study the growth of plants. The student used three (2)

potted plants with same amount of soil and additionally added manure in pot A,

fertiliser in pot B and left the pot C undisturbed. After 3 months, the student measured

the growth of each plant.



Pot Initial Growth(in cm) Final Growth(in cm)

A 10 25

B 10 35

C 10 18



The student again experimented and used the same soil for planting new plant. The table

shows the growth of each plant after 3 months.



Pot Initial Growth (in cm) Final Growth (in cm)

A 10 28

B 10 20

C 10 18



What can the student analyse from the experiment?

ncert class VIII ​

Answer 1

The student analyses from the experiment the following things:-

• From the observations of the first three potted plants, it can be analysed that fertiliser enriched the soil quality and gave pot B maximum growth. Pot A with manure had an intermediate growth as it enriches the soil in little amount. While plant C that's left undisturbed had no growth as the soil wasn't enriched.
• From the observations of the second experiment, it can be analysed that pot B had the least growth as a fertiliser affects the fertility of the soil in a long run. Moreover, manure doesn't affect the soil quality so plant A had little growth. While the undisturbed plant didn't show any growth again.

Answer 2

Answer:

The use of fertilizers repetitively reduces soil fertility. While using fertilizers may seem to produce a better yielding profit it only decreases soil fertility in the long run.