Agronomy - Study Mode

[#721] 'DIMBOA' is associated with
Correct Answer

(B) Maize

Explanation

Solution: DIMBOA is 2, 4-dihydroxy-7-methoxy-1, 4-benzoxazine-3-one a naturally occurring hydroxamic acid and is a powerful antibiotic present in maize . It was identified in maize in 1962 for the first time and named a 'corn sweet substance'. It can also form complexes with Iron in the rhizosphere and enhance the iron supply in maize.

[#722] Which one of the following is relay cropping system
Correct Answer

(B) Maize-potato-wheat-greengram

Explanation

Solution: Relay cropping is a method of multiple cropping where one crop is seeded into a standing second crop well before harvesting the second crop. Here, out the given option Maize-potato and wheat-green gram are an example of the relay cropping system.

[#723] In C 3 plants the first stable product is
Correct Answer

(C) PGA

Explanation

Solution: The C 3 cycle is also known as the Calvin cycle. The plants that go through the Calvin cycle are called C 3 plants. It is the cycle of chemical reactions that occur in the chloroplast of the plant cell where the carbon from the carbon cycle is fixed into sugars. 3-phosphoglyceric acid is the first stable product of the Calvin cycle in C 3 plants.

[#724] Highest total fertiliser consumption is in the state of
Correct Answer

(B) Punjab

Explanation

Solution: Punjab is the top state in the consumption of fertilizer in our country. Punjab alone consumes about 9% of the total fertilizers in India and it is 190.1 kg/ha per unit area basis on the gross cropped area. Maize is the greatest consumer of fertilizer in the world i.e. 16.2%, followed by wheat at 15.3 and rice at 133.7%

[#725] The Fe-chelate suitable for application to crops grown on acid soils is
Correct Answer

(D) Fe-HEDTA

Explanation

Solution: Fe-HEDTA is the Iron chelate suitable for application to crops grown on acid soils. Fe-HEDTA is Fe-Hydroxyethylenediaminetriacetic (Hydroxy ethylene diamine triacetic) acid. Iron is an essential nutrient for the growth of the plant, it acts as a component of many enzymes and catalyzes the formation of precursors of chlorophyll. The stability of iron chelates also depends on the hardness of the water and the pH of the soil.