FOOD TECHNOLOGY

Detailed explanation-1: -Which one of the following is an input that plays the most crucial role in subsistence rice farming in South East Asia? water for irrigation (Rice is usually grown in paddy fields-ponds filled up with water. Therefore, water is one of the most important inputs that is used for this type of food production.)

Detailed explanation-2: -These pores also allow water to enter the soil surface through infiltration, where it starts moving both laterally and vertically. The term soil scientists use for the connectivity of soil macro-and micropores and how quickly water moves through them is “soil permeability”.

Detailed explanation-3: -The largest soil particle is sand. The type of soil is dependent on how much of each particle is in the soil. Sand is a weathered rock and water easily passes through these particles. Silt is a little smaller than sand and is able to hold some water and is similar in texture to flour.

Detailed explanation-4: -Which of the following human activities contributed to worsening soil degradation in Sahel in 1970s and 1980s? How does irrigation lead to soil degradation? Over-irrigation in hot countries leads to high levels of evaporation, leaving salt deposits to build up on the soil (salinisation).

Detailed explanation-5: -Which of the following stages is characterised by the lowest soil fertility? Colonisation-Soil fertility is the lowest in the initial sere of succession. The soil is very shallow and poor in nutrient content due to the lack of diverse vegetation cover.