Plant Pathology - Study Mode
[#756] Urea has chemical composition
Correct Answer
(A) Co(NH 2 ) 2
Explanation
Solution: Urea has a chemical composition of Co(NH 2 ) 2 . Urea, also known as carbamide, is an organic compound with the chemical formula CO(NH 2 ) 2 . This amide has two amino groups (–NH 2 ) joined by a carbonyl functional group (–C(=O)–). It is thus the simplest amide of carbamic acid. It is a colorless, odorless solid, highly soluble in water, and practically non-toxic. A nitrogen-containing organic compound found in urine and other body fluids. Urea is synthesized from ammonia and carbon dioxide. Urea can be used as fertilizer.
[#757] The ascus is a sexual fruit of ascomycetes having a globose shape but no ostile (opening) is known as
Correct Answer
(A) Chleistothecia
Explanation
Solution: The ascus is a sexual fruit of ascomycetes having a globose shape but no ostile (opening) and is known as Chleistothecia. An ascus is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by mitotic cell division. Ascospores are nonmotile, usually single-celled, but not infrequently may be coenocytic (lacking a septum), and in some cases coenocytic in multiple planes.
[#758] The phosphorus content as P is plough layer of one hectare of soil containing 0.1% P 2 O 5 is
Correct Answer
(B) 860 kg
Explanation
Solution: The phosphorus content as P is the plough layer of one hectare of soil containing 0.1% P 2 O 5 is 860 kg.
[#759] Most of the plants obtain nitrogen from soil in the form of
Correct Answer
(B) Nitrate
Explanation
Solution: Most plants obtain nitrogen from the soil in the form of Nitrate. Nitrate is the form of nitrogen most used by plants for growth and development. Nitrate is the form that can most easily be lost to groundwater. Ammonium taken in by plants is used directly in proteins. This form is not lost as easily from the soil.
[#760] Copper deficiency causes
Correct Answer
(A) White bud in maize