The question asks to identify a major problem associated with shifting cultivation (also known as 'jhum' cultivation). We need to evaluate each option based on the characteristics and environmental impacts of this agricultural practice.
D) The cycle of jhum becomes shorter due to loss of soil fertility. This is a significant problem as increasing population pressure and reduced land availability force cultivators to return to previously used plots before the soil has fully recovered its fertility, leading to further degradation and reduced productivity.
The question asks for the defining characteristic of subsistence agriculture. We need to understand what 'subsistence' means in the context of agriculture and then evaluate the given options.
B) Mostly consumed by the farming household locally. This option accurately describes the primary characteristic of subsistence agriculture, where the produce is grown mainly for the direct consumption of the farmer's family, with little or no surplus for sale.
The question asks to identify the region where intensive subsistence agriculture is predominantly practiced, especially in densely populated areas. This type of agriculture is characterized by high labor input, small landholdings, and a focus on producing enough food for the farmer's family, often with a small surplus for sale. We need to consider the population density and agricultural practices of the given options.
A) Monsoon Asia is characterized by high population density, small landholdings, and a tradition of labor-intensive farming, primarily for self-consumption, which perfectly aligns with the definition of intensive subsistence agriculture.
The question asks for a typical characteristic of intensive subsistence agriculture, specifically dominated by wet paddy cultivation. We need to analyze the nature of this agricultural system to identify its key features regarding yield, labor, and technology.
B) High yield per unit area but low per labour productivity. This accurately describes intensive subsistence agriculture with wet paddy. The land is used very efficiently to maximize output from a small area, resulting in high yield per unit area. However, because a large number of people are involved in the cultivation process using traditional methods, the output per individual worker (labor productivity) remains low.
The question asks about the origin of plantation agriculture in tropical colonies. This is a historical and geographical concept related to colonialism and economic systems.
Correct Option: A) The Europeans
European colonial powers, such as the British, French, Spanish, Portuguese, and Dutch, were responsible for introducing and developing plantation agriculture in their tropical colonies across Asia, Africa, and the Americas. This system was designed to produce cash crops for export to Europe, utilizing local labor, often under exploitative conditions.
The question asks to identify which of the given options is NOT a plantation crop. To answer this, we need to understand the definition of a plantation crop and then classify each option accordingly.
C) Wheat is a cereal crop, primarily grown as a field crop for food consumption. It is not considered a plantation crop, which typically refers to perennial or long-duration crops grown on large estates for commercial purposes, often requiring significant processing.