Correct option is D
(A) All degraded lands are wasteland.
This statement is incorrect because not all degraded lands are considered wastelands. Land degradation refers to a decline in the productive capacity of the land, but it does not necessarily mean that the land becomes a wasteland.
(B) All degraded lands may not be wasteland, but unchecked process of development may lead conversion to wasteland.
This statement is correct. Degraded lands may not be wastelands initially, but if the degradation process continues unchecked due to unsustainable development practices, it can lead to the conversion of degraded lands into wastelands.
(C) Land degradation is permanent or temporary decline in productive capacity of the land.
This statement is correct. Land degradation refers to either a permanent or temporary decline in the productive capacity of the land, which can be caused by various factors such as soil erosion, nutrient depletion, salinization, or chemical pollution.
(D) Waterlogged, marshy areas and gullied lands are different types of degraded lands.
This statement is correct. Waterlogged areas, marshy areas, and gullied lands are examples of different types of degraded lands, where the land's productive capacity has been diminished due to specific degradation processes.