Assertion: All degraded land is treated as wasteland.
Reasoning: Soil erosion, water logging, Salinisation and alkalinisation of land lead to land degradation.

Assertion (A) is not true but Reasoning (R) is correct.

The correct answer is option 4: Assertion (A) is not true but Reasoning (R) is correct.

Assertion: All degraded land is treated as wasteland. False. Not all degraded land becomes wasteland. Some degraded land can still be reclaimed and used productively.
Reasoning: Soil erosion, water logging, Salinisation and alkalinisation of land lead to land degradation. Correct. These processes reduce the quality and productivity of land and are major causes of land degradation.

NCERT: " Land degradation is generally understood either as a temporary or a permanent decline in productive capacity of the land. Though all degraded land may not be wasteland, but unchecked process of degradation may lead to the conversion to wasteland."