Question

Given below is the cascade of events following deforestation. Select the option which arrange them in the correct sequence.
P : Erosion of top soil
Q : River channel become shallow.
R : Eroded soil gets deposited on the river bed as silt.
S : Destruction of crops leads to starvation.
T : Shallow channels cannot hold excess water during rain and hence cause flood.
U : Floods damage agricultural crops.

• A. $P\to Q\to R\to S\to T\to U$
• B. $P\to R\to Q\to T\to U\to S$
• C. $Q\to R\to P\to S\to T\to U$
• D. $P\to T\to U\to Q\to R\to S$

Answer 1

Answer: (B)

$P\to R\to Q\to T\to U\to S$

Land degradation is the permanent decline in the productivity of the land. It involves various steps:

There occurs erosion of the top layer of the soil. More than half of the topsoil on the planet has been lost in the past 150 years. After that, the eroded soil gets deposited on the river bed as silt. The river channels become shallow, which in turn cannot hold excess water during rain and hence cause a flood. The floodwater damaged the crops at a large number. This crop destruction leads to starvation crisis.