Science MCQ (1 Marks)

Minerals, organic matter air and water.

Clay soil will form a colloidal solution when suspended in water.

Topsoil

In the desert, there are few plants to hold soil in place and little water. Instead, wind is the main way that the rock pieces are moved around. The wind cannot move all the pieces though, just the small lighter ones, so sand is left behind. Over a long time the deserts become mostly sand.

Humus.

Lichens and other plants live on rocks and produce acids, which accelerate the process of soil formation.

Weathering.

Both of these

Loamy soil.

Sunflower

The uppermost horizon is generally dark in colour as it is rich in humus and minerals. The humus makes the soil fertile and provides nutrients to growing plants. This layer is generally soft, porous and can retain more water.
It is called the topsoil or A-horizon of the soil.

Clayey Soil.

Clayey Soil.

Clayey soil

Weathering of rocks is a step in the formation of soil because the basis of the formation of soil is soil minerals which are produced from the rocks.

Soil Erosion is the action of processes such as water flow or wind which remove soil and rock from one location on the Earth's crust, then transport it to another location where it is deposited.

Here, all the statements are correct.

Clay soil is mainly composed of the smallest particles of soil, which are densely packed with very few particles and effectively retain water. that's why it helps the plants to grow well.

Texture refers to the size of the particles that make up the soil. The terms sand, silt, and clay refer to relative sizes of the soil particles. The combined portions of sand, silt, and clay in a soil determine its textural classification.

None of these

Soil profile

All of these.

Virus

All of these

Loamy Soil.

None of these

The microorganism present in the soil having plenty of water and nutrients are present in the habitat of forest.

Clayey soil.

Deforestation and high speed winds causes soil erosion.

Sandy soil

Decomposing bacteria and fungi destroy dead plants and animals in the soil.
Humus is the substance that results from this degradation process.
Humus is a nutrient-dense, black-colored substance.
As a result, topsoil is the darkest.
he more humus in the soil, the more productive it is.

The fertility of soil depends upon the soil structure. Due to good soil structure, roots get a sufficient oxygen supply and water drainage is good. Therefore, the roots of plants grow well.

The best soil for growing paddy is the Clayey soil as they can hold the water due to their very fine particle size.

Silt is found in deposits of river beds.

Erosion.

Paddy crop yields more if it is grown in clay and organic matter and having a good capacity to retain water. Wheat crops yield more when it is grown in fine clayey soil because it is rich in humus and is very fertile. Cotton is grown in sandy and loamy soil, which drains water easily and holds plenty of air

Organic matter

Terrace farming

Clayey soil.

Silty is not a type of soil. Sand, clay, silt, and humus in the proper amounts make up loamy soil.

Minerals, organic matter, Air and water.

necessary throw waste also contain food with plastic, when cattles hunt for their food they eat food along with plastic which can led to their death. plastic also cause soil pollution as plastic is not burn completely and it leaves residue.