The correct order of the increasing size of soil particle is-

The upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles. It provides home to variety of microscopic and macroscopic organisms.

So, the correct option is 'All of these'. 

Relative size of sand, silt and clay particles. Soil is made up of different-sized particles. Sand particles tend to be the biggest. 

Clay and silt soils tend to stick together, not allowing water and air to penetrate soil structure. They have poor soil porosity and do not let water drain. Aeration is poor and many plants decline and die in these non-porous, waterlogged soils. Poor porosity facilitates erosion of soils as rainwater washes particles off the surface rather than penetrating into soil. 

Clay soil particles are very small in size and packed tightly, water does not drain quickly, clayey soil is not well aerated and retains more water. Humus can easily mix or packed with clayey because of small particles also maintain the moisture in the soil and makes it more fertile. Thus, the answer is C.

Loamy soil is a mixture of various soil types. It has sand, silt and clay particles together. It has large air spaces inside it that allow free movement of air and water through it. 

Clay soil is soil that contains a high percentage of clay particles. It is slow to drain water and quick to harden holding the maximum amount of water and hence causing waterlogging. It blocks root absorption, which prevents plants from getting nutrients required for survival. Thus the correct answer is option C.

Loamy soil is the healthiest soil as it is a combination of minerals, rock, water and organic matter. Hence the soil contains microorganisms, insects, and worms that replenish soil fertility. Thus the correct answer is option C.

Clay soil particles are very small, packed very tightly and little space remain for air, water can be held in tiny space between the particles, so it has a good capacity to hold water. Thus, the correct option is C.

Loamy soil is a mixture of sand, clay and small types of other soil particles and the soil formed are known as silt. It is basically deposited on river beds. It is good for the growth of plants. Thus, the correct answer is D.

In humus, the percolation speed is very high. This means that more amount of substances are able to pass through it. Percolation rate is basically the rate at which the water moves through granular material. In humus, water moves very quickly. As a result, its percolation rate is very high.

Silts deposits on the river beds. Silts consist of fine sand, clay and other small stone particles which are carried by running or flood water, and deposited at the river beds. Thus, the correct option is A.

Clayey soil is used to make pots, toys and statues because the clayey soil has the highest water holding capacity than loamy, sandy and silt. Thus, the correct option is D.

Sandy soil is made of sand particles that are rough in texture. This prevents them from sticking tightly together. The space between sand particles is large for water to flow through it. Hence sandy soil drains faster than other types of soil. Thus the correct answer is option C.

Loamy soil is a mixture of clay, sand and silt. Particles of loamy soil are smaller than sand and larger than clay. Loamy soil has also a good water holding capacity and suitable for plants growth. Thus, the correct answer is D.

Water should percolate slowly in a soil because if water passes too rapidly, then many of the minerals and organic matter useful for plants will simply be washed away. If there is no percolation and all the water is simply held up in the soil, then there will be poor aeration and respiration in plant roots will suffer.

Sediment refers to solid fragments of inorganic or organic material, that comes from the weathering of rock and are carried and deposited by wind, water, or ice. Sedimentary soil is the transported soil, which is formed in this manner. Alluvial soil is the already formed soil, carried and deposited by flowing water as rivers etc.

Soil can be classified on the basis of the size of the particle and its water holding capacity into clay soil, sand soil and loam soil, silt soil. Clay soil has the finest particles of all the soils. Hence, it is the least porous soil. Sand soil has the largest size of particles. They are the most porous soil.

Presence of oxygen is necessary for the growth of a microorganism in the organic matter. Under anaerobic conditions most of fungi and actinomycetes growth suppressed only a few bacteria grow in anaerobic organic decomposition. The rate of temperature for maximum growth of the microorganism is 30° to 40°'. The adequate moisture is required for the proper decomposition of organic matter. The rate of decomposition of organic matter is maximum in the neutral soils than the acidic soil. C: N  ratio has a great influence on the decomposition. Narrow C: N ratio of soil and organic water is required for rapid and better decomposition of organic matter.

So, the correct answer is ' Aerobic conditions, > 25°C temperature '

Physiologically dry soil have very high concentration of salts. It is basicly dead soil from lack of oxygen and high salt content. The halophytes are plants of physically wet but physiologically dry habitats. Such plants are commonly found near sea-shores where mesophytes and freshwater hydrophytes cannot thrive well. Although these plants grow in the areas which are well saturated with water yet they cannot avail of the water because of high concentration of salts in the soils. 

Mole drainage is widely used in New Zealand and the United Kingdom in heavy soils to improve productivity of pastures and crops. Mole drains are used in heavy soils where a clay subsoil near moling depth (400 to 600 cm) prevents downward movement of ground water. The aim of mole drainage is to fracture and crack the soil in order to improve the capacity of the soil to transmit water. Mole drainage is used in impermeable soils as a cost-effective means of facilitating a shallow pipe drain network. Mole drainage is suited to soils with a high clay content which form stable channels.

A soil may be physically wet; but if the plants absorb the water only with difficulty, as in a salty marsh water logged soil, then the soil is physiologically dry. The halophytes are plants of physically wet but physiologically dry habitats. Such plants are commonly found near sea-shores where mesophytes and freshwater hydrophytes cannot thrive well. Although these plants grow in the areas which are well saturated with water yet they cannot avail of the water because of high concentration of salts in the soils. 

Explanation: Soil conservation is the prevention of soil from erosion or reduced fertility caused by overuse, acidification, salinization or other chemical soil contamination. Slash-and-burn and other unsustainable methods of subsistence farming are also practiced in some lesser developed areas.