Q1.The productivity of a soil depends upon the proportionate amount of deficient mineral is called
Answer : Option BExplaination / Solution:
Justus von Liebig's Law of the Minimum states that yield is proportional to the amount of the most limiting nutrient, whichever nutrient it may be.
From this, it may be inferred that if the deficient nutrient is supplied, yields may be improved to the point that some other nutrient is needed in greater quantity than the soil can provide, and the Law of the Minimum would apply in turn to that nutrient.
Q2.Dark brown amorphous substance formed by degradation of cellulose and lignin in the soil to increase water holding capacity and aeration is
Answer : Option AExplaination / Solution:
Dark brown amorphous substance formed by degradation of cellulose and lignin in the soil to increase water holding capacity and aeration is humus. It also increase fertility of the soil.
Q3.Main function of Nickel (Ni2+) in leaves and root is
Answer : Option BExplaination / Solution:
Main function of Nickel ions in leaves and root is metabolism of urea and ureides to form amino acids and protein in plant body.
Answer : Option DExplaination / Solution:
Nitrogen-fixing bacteria, especially roots of legumes, can fix this atmospheric nitrogen into biologically usable forms.
Answer : Option CExplaination / Solution:
Plants obtain it in the form of molybdate ions. It is a component of several enzymes, including nitrogenase and nitrate reductase both of which participate in nitrogen metabolism.
Answer : Option AExplaination / Solution:
Hydroponics is a subset of hydroculture, the method of growing plants without soil, using mineral nutrient solutions in a water solvent.
Q7.It is the technique of growing plants in above-ground strands provided with fine mist of normal solution.
Answer : Option BExplaination / Solution:
Aeroponics is the technique of growing plants in above ground strands provided with fine mist of normal solution. It is used to know the deficiency symptoms of minerals.
Q8.Plant with zinc deficiency show reduced biosynthesis of
Answer : Option BExplaination / Solution: Plants obtain zinc as Zn2+ ions. It activates various enzymes,especially carboxylases. It is also needed in the synthesis of auxin.If there is deficiency in zinc to plants then it leads to reduced synthesis of auxin.
Answer : Option CExplaination / Solution:
Calcium is required by meristematic and differentiating tissues. During cell division it is used in the synthesis of cell wall, particularly as calcium pectate in the middle lamella.