Explanation

Soil erosion is primarily caused by the natural forces of water and wind, as well as human activities that disrupt the soil.

These factors can accelerate the process of topsoil removal, leading to land degradation and decreased fertility. 

Explanation

Silt is actually very useful for gardening, as its fine texture helps retain moisture and nutrients.

It is rich in minerals, making it suitable for plant growth, unlike the statement suggesting it isn't.

Explanation

The root stock is the bottom portion of the plant that is used for grafting.

It provides the root system and supports the scion.

The scion is the top portion of another plant that is grafted onto the root stock to grow and produce the desired fruit or flowers.

Explanation

Ribosomes are the organelles responsible for protein synthesis.

They are often referred to as the "factories of food" because they assemble amino acids into proteins.

They can be found either floating freely in the cytoplasm or attached to the endoplasmic reticulum.

Explanation

Hepatitis A and E are typically acute, short-term infections that resolve on their own without causing chronic liver disease.

Hepatitis B and C, on the other hand, can lead to chronic infections.