Hydroponics cannot be used in the commercial production of vegetables such as

Which of the following is the essential requirement of Hydroponics?

Which of the following is the essential requirement of Hydroponics?

The soil is enriched of dissolved ions and inorganic salts because of

Which of the following is not true about soil?
P. Soil not only supplies minerals but also harbours nitrogen fixing bacteria and other microbes
Q. It holds water
R. It supplies air to the roots
S. It acts as a matrix that stabilises the plant
T. It is a source of photosynthate
U. It is positively geotropic without any exception

1. S, T and U
2. T and U
3. S and U
4. R and T

The soil is enriched of dissolved ions and inorganic salts because of