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For students in search of
- Hydroponic Gardening
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Guides - Basics to Experts level
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Growing fruit and vegetables hydroponically
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Practical daily questions or queries of hydroponics lovers
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Current Hydroponics and Indoor Gardening Market Growth as well as Trends
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| 551. |
Which of the following is wrong? |
| A. |
Iron, manganese, copper, zinc, boron, molybdenum, chlorine and cobalt are called micronutrients. |
B. |
Nitrogen, phosphorus and potassium are primary nutrients |
| C. |
Calcium, magnesium and sulphur are secondary nutrients |
D. |
Nitrogen is converted into nitrate by earthworms |
Answer: Option D
Explanation:
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| 552. |
Which of the following methods is most useful to increase the availability of soil applied phosphorus? |
| A. |
Broadcast |
B. |
Placement |
| C. |
Broadcast and soil incorporation |
D. |
None of these |
Answer: Option B
Explanation:
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| 553. |
Which of the following nutrient elements are regarded as energy exchangers? |
| A. |
Hydrogen and oxygen |
B. |
Carbon and nitrogen |
| C. |
Potassium and magnesium |
D. |
Iron, manganese and molybdenum |
Answer: Option A
Explanation:
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