mineral nutrition Flashcards
In_____year,_______ , a prominent German botanist, demonstrated,
for the first time, that plants could be grown to maturity in a defined
nutrient solution in complete absence of soil.
1860, Julius von Sachs
Hydroponics has
been successfully employed as a technique for the
commercial production of vegetables such as
tomato, seedless cucumber and lettuce
It must be
emphasised that the nutrient solutions must be
adequately ______ to obtain the optimum growth.
aerated
Most of the minerals present in soil can enter plants
through____ .
roots
More than___ elements of
the___ discovered so far are found in different
plants.
sixty , 105
Some plant species accumulate selenium,
some others gold, while some plants growing near
nuclear test sites take up radioactive ____.
strontium.
There are techniques that are able to detect the
minerals even at a very low concentration of ____.
10^-8 g/ml
elements
are divided into two broad categories based on their_____
requirements.
quantitative
The macronutrients include
carbon, hydrogen, oxygen, nitrogen, phosphorous, sulphur, potassium,calcium and magnesium.
carbon, hydrogen and oxygen are
mainly obtained from___ and___ , while the others are absorbed from
the soil as mineral nutrition.
CO2, H2O
Micronutrients or_____ , are needed in very small amounts
less than 10 mmole Kg –1 of dry matter
trace elements
Micronutrients include
iron, manganese,
copper, molybdenum, zinc, boron, chlorine and nickel.
In addition to the __ essential elements , there are some
beneficial elements such as ______________. They
are required by higher plants.
17, sodium, silicon, cobalt and selenium
Essential elements can also be grouped into___ broad categories on
the basis of their diverse functions.
four
Essential elements as components of biomolecules and hence
structural elements of cells are
carbon, hydrogen, oxygen and
nitrogen
