Question

What affects the soil profile and brings changes in soil structure?.
A) Vegetation
B) Animals
C) Climatic factors
D) Fertilizers

Answer 1

Hint: Soil is a very important thing for all living creatures, there are a lot of invertebrate living organisms and various microbes such as protozoan were found in the soil, and this living organism makes the soil more fertile and nutrient-rich so that it can be used for agriculture purpose, but the living organisms which are present in the soil are active and make the soil fertile in only during the favorable conditions.

Complete answer:
The primitive organisms that are present or live in the soil, makes the burrows in soil, and make the soil porous and aerated, fungi that found in the soil depends on the dead worms and all decompose and release all organic molecule to the soil and makes the soil nutrient rich. And these conditions are most favorable for Plant growth.
So favorable environmental conditions such as temperature are should be in control where high temperature causes the loss of water in soil or unsaturated which may damage many soil based living organisms, and this makes soil less nutritive and at the same time plants which are present in non nutritive soil many prone for diseases and to insects, as in unfavorable climatic conditions makes fungi, other microbes like bacteria and fungi to be parasitic.
So climatic factors such as temperature, are important as high temperature causes loss of water which is important for weathering of the soil, and the transportation.
Whereas climate also influences the rate of weathering of soil, and chemical weathering so the important climatic factors such as temperature and rainfall plays a major role to maintain the soil structure.

So, the correct option is C.

Note: The soil profile is mainly dependent on the amount of nutrients as they make the soil fertile and favorable for the plant's growth, and the nutrients are obtained from the various living organisms, that are present in soil, but these are very influenced by climatic factors, so climate plays important which bring the changes in the soil.