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

(1) Tomato

(2) Seedless cucumber

(3) Lettuce

(4) Pomegranate

(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) Qualitative properties

(2) Structural properties

(3) Quantitative requirements

(4) Both B and C

(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) 20

(2) 17

(3) 24

(4) 15

(1) Required by higher plants

(2) Na,Si,Co,Se

(3) Other than 17 essential elements

(4) All of these

(1) C

(2) O

(3) N

(4) Mg

(1) Magnesium in chlorophyll

(2) Phosphorus in ATP

(3) Carbon in DNA

(4) Both 1 and 2