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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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| 161. |
Heterotrophic organisms obtain energy from the biological oxidation of: |
| A. |
Organic carbon |
B. |
NH4 |
| C. |
SO4-2 |
D. |
CO2 |
Answer: Option A
Explanation:
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| 162. |
Highly available form of phosphorus at pH 7.5 is: |
Answer: Option C
Explanation:
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| 163. |
Hilly soils are low in lime and: |
| A. |
Alkaline |
B. |
Acidic |
| C. |
Saline |
D. |
None of these |
Answer: Option B
Explanation:
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| 164. |
Horizontal layers in the soil profile are known as: |
| A. |
Soil columns |
B. |
Horizontal zones |
| C. |
Soil horizons |
D. |
Rhizospheres |
Answer: Option B
Explanation:
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| 165. |
How many orders are included in the 7th Approximation system of soil classification? |
Answer: Option C
Explanation:
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| 166. |
Smectite groups include: |
| A. |
Kaolinite |
B. |
Brucite |
| C. |
Saponite |
D. |
Illite |
Answer: Option C
Explanation:
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| 167. |
Humus colloids are composed basically of: |
| A. |
Carbon |
B. |
Nitrogen |
| C. |
Helium |
D. |
Ozone |
Answer: Option A
Explanation:
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| 168. |
Humus enhances the mineral breakdown and increases the availability of some: |
| A. |
Anions |
B. |
Cations |
| C. |
Neutral ions |
D. |
None of these |
Answer: Option B
Explanation:
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| 169. |
Hydraulic conductivity of soils varies directly with: |
| A. |
Capillary porosity |
B. |
Non-capillary porosity |
| C. |
Total porosity |
D. |
Water holding capacity |
Answer: Option C
Explanation:
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| 170. |
Hydrogen requirement of plants in met by: |
| A. |
Absorption of hydrogen from air |
B. |
Absorption of hydrogen from water |
| C. |
Absorption of hydrogen from soil |
D. |
Break-down of water within the plant |
Answer: Option D
Explanation:
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