Practice 247 free Class 9 Science - IMPROVEMENT IN FOOD RESOURCES questions with answers and step-by-step solutions.
What is genetic manipulation? How is it useful in agricultural practices?
The figure shows two crop fields [Plots $A$ and $B$] that have been treated with manures and chemical fertilizers,respectively,while keeping other environmental factors constant. Observe the graph and answer the following questions.
$(i)$ Why does plot $B$ show a sudden increase and then a gradual decrease in yield?
$(ii)$ Why is the highest peak in the plot $A$ graph slightly delayed?
$(iii)$ What is the reason for the different patterns of the two graphs?
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