Q. No.Minerals known to be required in large amounts for plant growth include
1. phosphorus, potassium, sulphur, calcium
2. calcium, magnesium, manganese, copper
3. potassium, phosphorus, selenium, boron
4. magnesium, sulphur, iron, zinc
2. calcium, magnesium, manganese, copper
3. potassium, phosphorus, selenium, boron
4. magnesium, sulphur, iron, zinc
Which of the following element is responsible for maintaining turgor in cells?
| 1. Magnesium | 2. Sodium |
| 3. Potassium | 4. Calcium |
In which of the following forms is iron absorbed by plants?
| 1. Ferric | 2. Ferrous |
| 3. Free element | 4. Both ferric and ferrous |
Sulphur is an important nutrient for optimum growth and productivity in:
| 1. pulse crops | 2. cereals |
| 3. fibre crops | 4. oilseed crops |
Manganese is required in
1. nucleic acid synthesis
2. plant cell wall formation
3. photolysis of water during photosynthesis
4. chlorophyll synthesis
Which one of the following elements is not an essential micronutrient for plant growth?
| 1. Mn | 2. Zn |
| 3. Cu | 4. Ca |
Which one of the following is essential for photolysis of water ?
| 1. Boron | 2. Manganese |
| 3. Zinc | 4. Copper |
Which one of the following mineral element plays an important role in biological nitrogen fixation:
| 1. Copper | 2. Manganese |
| 3. Zinc | 4. Molybdenum |
Nitrifying bacteria
1. convert free nitrogen to nitrogen compounds
2. convert proteins into ammonia
3. reduce nitrates to free nitrogen
4. oxidize ammonia to nitrates
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