Identify the given type of hydroponic technique and select the correct option.

Options

A. (a) A very shallow stream of water containing dissolved nutrients is recirculated past the roots of plants in a watertight channel.
B. (b) The nutrient solution flows in a thin film over the roots ensuring that the upper part of the roots gets sufficient supply of oxygen.
C. (c) Roots keep suspended in the air over the nutrient solution which is provided in the form of a nutrient mist.
D. (d) Both a and b

Answer

D

Explanation

The given figure represents the nutrient film technique of hydroponics. In this technique, a very shallow stream of water containing all the dissolved nutrients requried for plant growth is recirculated past the bare roots of plants in a water tight channel. the depth of the recirculating stream is very shallow (thin film) ,which ensures that the thick root and mat, which develops at the bottom of the channel, has an upper surface in sufficient supply of air/oxygen. The main advantage o f this system is that the plant roots are exposed to adequate quantities of water, `O_(2)` and nutrients.