1. In 1860, ___________ for the first time demonstrated the concept of hydroponics.
a) Van Neil
b) Von Sachs
c) Arnon
d) Lundergarth
Explanation: In 1860, Von Sachs for the first time demonstrated the concept of hydroponics.
2. Hydroponics require
a) Purified water
b) Impure water
c) Mineral nutrient salt
d) Both (a) and (c)
Explanation: Hydroponics require purified water and mineral nutrient salt
3. Hydroponic is a successfully employed technique for the commercial production of vegetables
like
a) Tomato
b) Seedless cucumber
c) Lettuce
d) All of these
Explanation: All of these
4. Find the true/false statement from the following:
(a) Only 50 elements are found in diff erent plants.
(b) In hydroponics, the nutrient solution must be adequately aerated to obtain optimum growth.
(c) Some plant species accumulate selenium.
(d) By hydroponics essential elements were identifi ed and their defi ciency symptoms were
also discovered.
a) FTTT
b) FFTT
c) FTFT
d) FFFT
Explanation: FTTT
5. Which one of the following is Arnon’s criterion for the essentiality of element?
a) In the absence of element, plants do not complete their life cycle or set the seeds.
b) Defi ciency of element cannot be met by supplying other element.
c) The element must be directly involved in the metabolism of the plant.
d) All the above
Explanation: All the above
6. What indicates A to D in the given figure?
a) A: Cotton, B: Aerating tube, C: Funnel for adding water and nutrients, D: Nutrient solution
b) A: Funnel for adding water and nutrients, B: Aerating tube, C: Cotton, D: Nutrient solution
c) A: Nutrient solution, B: Cotton, C: Funnel for adding water and solution, D: Aerating tube
d) A: Cotton, B: Aerating tube, C: Nutrient solution, D: Funnel for adding water and nutrients
Explanation: A: Funnel for adding water and nutrients, B: Aerating tube, C: Cotton, D: Nutrient solution
7. By some techniques ___________ are able to detect the mineral at very low concentration.
a) \[10^{-12}gm/ml\]
b) \[10^{-15}gm/ml\]
c) \[10^{-10}gm/ml\]
d) \[10^{-8}gm/ml\]
Explanation: \[10^{-8}gm/ml\]
8. On which basis the nutrients are divided into macro and micro nutrients?
a) Quantitative requirement
b) Qualitative requirement
c) Both (a) and (b)
d) None of these
Explanation: Quantitative requirement
9. The following are macronutrients except
a) N
b) P
c) S
d) Mn
Explanation: Mn
10. The following are micronutrients except
a) Zn
b) B
c) Mo
d) ca
Explanation: ca