Session 1: Macro and Micro-nutrients in Soil System
Unit 4: Soil Nutrient Management in VegetableCrops
Textual Question-Answers
Check Your Progress
Fill in the Blanks
1. Compounds made up of carbon, hydrogen and oxygen togetherare called…………
Ans: carbohydrates
2. Plants obtain carbon, hydrogen and …………… from air andwater.
Ans: oxygen
3. Micro-nutrients are also known as minor or …………… elements.
Ans: trace
4. The function of ………………… is to give dark green colour andimprove the quality of foliage.
Ans: nitrogen
5. Stimulating root formation and their healthy growth are thefunctions of……………
Ans: phosphorus
6. Calcium is an important constituent of the…………
Ans: cell wall
7. Magnesium helps in …………… assimilation.
Ans: carbohydrate
8. Zinc fastens the rate of ……………… in plants.
Ans: photosynthesis
9. Manganese is involved in the ……………… process ofphotosynthesis.
Ans: photolysis
10. Nitrogen fixation and nitrate assimilation are the functions of………
Ans: molybdenum
Multiple Choice Questions
1. ……… essential elements are required for plant growth anddevelopment.
(a) 15
(b) 16
(c) 17
(d) 18
Ans: (c) 17
2. ……………… are the micro-nutrients.
(a) Ca, Mg, S
(b) N, P, K
(c) C, H, O
(d) Zn, Cu, B
Ans: (d) Zn, Cu, B
3. ……………… helps in the synthesis of the bases of RNA.
(a) Boron
(b) Molybdenum
(c) Chlorine
(d) All of the above
Ans: (b) Molybdenum
4. Molybdenum in plant is necessary for…………(a) protein synthesis
(b) photosynthesis
(c) chlorophyll
(d) nitrogen fixation
Ans: (d) nitrogen fixation
5. Deficiency of boron results in……………
(a) loss of apical dominance
(b) rosette appearance
(c) syrupy exudation from the leaf blade
(d) all of the above
Ans: (d) all of the above
Descriptive Questions
1. What are the criteria of essentiality of nutrients?
Ans: A nutrient is considered essential if its absence prevents the plant from completing its life cycle. The deficiency of the nutrient is specific andcan be corrected only by supplying that nutrient. The nutrient must have adirect role in plant metabolism and growth, and it cannot be replaced by anotherelement.
2. What are micro and macro-nutrients? Give examples.
Ans: Macronutrients are nutrients required by plants in large quantities. Examples are nitrogen, phosphorus, potassium, calcium, magnesium, and sulphur.
Micronutrients are nutrients required in small quantities. Examples areiron, zinc, copper, boron, manganese, molybdenum, and chlorine.
3. What are the important functions of nitrogen? Write its deficiencysymptoms.
Ans: Nitrogen is essential for vegetative growth and is a major component of proteins, enzymes, and chlorophyll. It promotes leafy growth and givesdark green colour to plants. Deficiency symptoms of nitrogen include stunted growth, pale green oryellowing of older leaves, reduced leaf size, and poor yield.
Match the Columns
Nutrients
1. Phosphorus
2. Potassium
3. Sulphur
4. Calcium
5. Magnesium
6. Zinc
7. Iron
8. Molybdenum
9. Boron
Functions/deficiency causes
(a) Synthesis of the bases of RNA
(b) Nitrogen fixation and nitrate assimilation
(c) Synthesis of chlorophyll
(d) Assimilation of fats
(e) Tryptophan
(f) Failure of terminal bud development
(g) Reddening of stems and inward curling of leaves
(h) Dark bluish green leaves
(i) Curled up and purplish in colour
Ans:
1. Phosphorus – (h) Dark bluish green leaves
2. Potassium – (g) Reddening of stems and inward curling of leaves3. Sulphur – (d) Assimilation of fats
4. Calcium – (f) Failure of terminal bud development
5. Magnesium – (c) Synthesis of chlorophyll
6. Zinc – (e) Tryptophan
7. Iron – (i) Curled up and purplish in colour
8. Molybdenum – (b) Nitrogen fixation and nitrate assimilation9. Boron – (a) Synthesis of the bases of RNA
