Which elements is/are major elements for plant growth?.
- Phosphorus
- Potasium
- Nitrogen
- All of these
Submitted by :- Muhammad Nawaz
mnsoomro
Which of the following is the substances which can be added to the soil to deliver necessary elements for growth?
- Fertilizers
- Growth regulators
- Plant hormones
- Pesticides
Submitted by :- Muhammad Nawaz
What is the percentage of nitrogen in ammonia?
- 82%
- 72%
- 46%
- 32%
Submitted by :- Muhammad Nawaz
Ethanol can be converted into ethanoic acid by_________________?
A. Hydrogenation
B. Oxidation
C. Hydration
D. Fermentation
Submitted by :- Jamil Ahmed
The nitrogen present in some fertilizers helps plants.
- to fight against diseases
- to produce protein
- to undergo photosynthesis
- to produce fat
Submitted by :- Muhammad Nawaz
Treating phenol with formaldehyde in the presence of dilute base forms Bakelite. The process involved is_________________?
A. oxidation
B. elimination
C. condensation polymerization
D. additional polymerization
Submitted by :- Jamil Ahmed
What is the percentage of nitrogen in urea?
- 46%
- 77%
- 88%
- 23%
Submitted by :- Muhammad Nawaz
Heating phenol with Zn will yield_________________?
A. Benzene
B. Benzoic acid
C. Phenoxide
D. Cyclohexane
Submitted by :- Jamil Ahmed
Which is ideal for horticultural crops and for tobacco and potatoes.
- Potassium Nitrate
- Potassium chloride
- Potassium sulphate
- None of these
Submitted by :- Muhammad Nawaz