Agronomy - Study Mode
[#836] In which crop, the use of BGA as a biofertilizer, will be most useful
Correct Answer
(C) Rice
Explanation
Solution: BGA stands for Blue green algae, used as biofertilizer in eco-friendly agricultural practice. As algae can grow in an aquatic medium, it is useful for paddy plantations where the field is submerged in water. BGA has emerged as an economical and environment friendly fertilizer.
[#837] Calculate the plant population of maize sown in 5000 sq m area if the crop is sown in paired row of 40/80 cm and P-P 25 cm
Correct Answer
(A) 33,333
Explanation
Solution: How to calculate plant population: 1. The plant population of any field is given by multiplying the plant's spacing by the spacing between the rows. 2. The total area of the field a square meters. 3. Divide 10,000 by the result of multiplying the between plant spacing and the between rows spacing as given: $${ ext{Plant population =}}$$ xa0 xa0$$frac{{{ ext{area of field under cultivation }}left( {{{ ext{m}}^2}}
ight)}}{{{ ext{between plant spacing (m)}} imes { ext{between rows spacing row (m)}}}}$$ Here, Space between the plants is 40 and 80. Taking average is 60 centimeter = 0.6 meter Space between the rows = 25 centimeter = 0.25 meter $$eqalign{
& { ext{Plant population}} = frac{{5,000}}{{0.60 imes 0.25}} cr
& ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = frac{{5,000}}{{0.15}} cr
& ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = 33,333 cr} $$
[#838] Which cation has low absorption capacity on clay
Correct Answer
(D) Na
Explanation
Solution: Ion exchange is the exchange of ions in any crystal or on any surface. Ion exchange in clay minerals occurs because clay minerals can absorb cations from the solution while the absorption of anions from the solution is very less. While sodium cation has a low absorption capacity on clay and it is influenced by the composition and salinity of the solutions.
[#839] Stomata closing can be induced by
Correct Answer
(D) P. M. A.
Explanation
Solution: P. M. A. stands for Phenyl Mercuric Acetate is an odorless, crystalline powder, which is more often used as an herbicide, antiseptic, catalyst, fungicide and preservative for latex paints. P. M. A. induces stomatal closure and thus acts as an antitranspirant when used at low concentrations for a short duration.
[#840] Atmospheric concentration of argon
Correct Answer
(B) 0.93%
Explanation
Solution: Our Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, 0.9 % argon and 0.1% of all other gases like carbon dioxide, methane, water vapour and neon. Argon is the third most abundant noble gas in the earth’s atmosphere at 0.934%.