Which of the following is the essential requirement of Hydroponics?

(1) Aeration to obtain the optimum growth

(2) Lage vessel

(3) Broader neck

(4) Cotton plugs for funnel adjustment

(1) 105

(2) 35

(3) 44

(4) More than 60

(1) There are techniques that are able to detect the minerals even at a very low concentration i.e. 10 mg/mL

(2) Some plant species accumulate selenium and some others gold

(3) Some plant species nuclear test sites take up radioactive Strontium

(4) The criteria for essentiality of an element completely depends upon the amount of element

(1) The element must be absolutely necessary for supporting normal growth and reproduction

(2) In the absence of element, the plant is not able to complete their life cycle or set the seeds

(3) The requirement of that element must be specific can be replacable by another element

(4) The element must be directly involved in metabolism

(1) Qualitative properties

(2) Structural properties

(3) Quantitative requirements

(4) Both B and C

(1) N

(2) O

(3) H

(4) All of these

(1) P

(2) S

(3) K

(4) Mn

(1) P

(2) C

(3) H

(4) O

(1) More than 10mmole per Kg of dry matter

(2) Less than 10mmole per Kg of dry matter

(3) Around 1mmole per Kg of dry matter

(4) Less than 1mmole per Kg of dry matter

(1) Cu

(2) Mn

(3) Zn

(4) K