Mineral Nutrition and Absorption
Multiple Choice Questions and Answers
1. Which of the following elements is a component of ferredoxin?
(a) copper
(b) manganese
(c) zinc
(d) iron
Answer: (d) iron
2. Mineral salts absorbed by the roots from the soil are in the form of
(a) very dilute solution
(b) dilute solution
(c) concentrated solution
(d) very concentrated solution
Answer: (a) very dilute solution
3. Chlorosis occurs when plants are grown in
(a) dark
(b) shade
(c) strong light
(d) Fe-free medium
Answer: (d) Fe-free medium
4. Little leaf disease is developed due to deficiency of
(a) copper
(b) sodium
(c) zinc
(d) molybdenum
Answer: (c) zinc
5. ‘Dieback’ of Citrus and ‘reclamation’ of legume and cereals is due to the deficiency of
(a) copper
(b) sodium
(c) zinc
(d) molybdenum
Answer: (a) copper
6. Hydroponics is
(a) growing of aquatic plants
(b) growing of floating aquatic plants
(c) soil-less cultivation of plants
(d) growing of plants in water
Answer: (c) soil-less cultivation of plants
7. Presence of phosphorus
(a) brings about healthy root growth
(b) promotes fruit ripening
(c) retards protein formation
(d) none
Answer: (c) retards protein formation
8. The micronutrient among these is
(a) zinc
(b) nitrogen
(c) phosphorus
(d) calcium
Answer: (a) zinc
9. Zinc is essential for
(a) biosynthesis of chlorophylls
(b) biosynthesis of 3 Indole Acetic Acid
(c) stomatal closing
(d) oxidation of carbohydrates
Answer: (b) biosynthesis of 3 Indole Acetic Acid
10. Stem and root tips die due to deficiency of
(a) Nitrogen
(b) Phosphorus
(c) Calcium
(d) Sulphur
Answer: (c) Calcium
11. The theory suggesting that carbon dioxide produced in respiration helps in mineral absorption is called
(a) carbonic acid exchange theory
(b) contact exchange theory
(c) active mineral absorption
(d) Donnan-equilibrium
Answer: (a) carbonic acid exchange theory
12. Which one of the following plays an independent role in energy metabolism?
(a) calcium
(b) sodium
(c) sulphur
(d) phosphorus
Answer: (d) phosphorus
13. Nitrogen is an important constituent of
(a) proteins
(b) lipids
(c) carbohydrates
(d) phospholipids
Answer: (a) proteins
14. Soil salinity is measured by
(a) porometer
(b) photometer
(c) conductivity meter
(d) calorimeter
Answer: (c) conductivity meter
15. Minerals are absorbed by plants in
(a) colloidal form
(b) ionic form
(c) in solid form
(d) in molecular form
Answer: (b) ionic form
16. A membrane bound ion pump
(a) requires a protein carrier
(b) moves a molecule against its concentration
(c) requires a supply of energy
(d) all of the above
Answer: (d) all of the above
17. Mid-day closure of stomata is due to
(a) fatigue
(b) excessive transpiration
(c) fast wind
(d) high rate of photosynthesis
Answer: (b) excessive transpiration
18. Deficiency of iron causes
(a) interveinal chlorosis first on young leaves
(b) bending on leaf tip
(c) reduced leaf area and stunted growth
(d) decrease in protein synthesis
Answer: (a) interveinal chlorosis first on young leaves
19. Active process of salt absorption is inhibited by
(a) presence of oxygen
(b) presence of nitrogen
(c) absence of oxygen
(d) presence of sulphur
Answer: (c) absence of oxygen
20. Rosette of apple or peach is a disease due to deficiency of
(a) zinc
(b) manganese
(c) iron
(d) copper
Answer: (a) zinc
21. Which of the following chemical is essential for photolysis of water?
(a) oxygen
(b) carbon
(c) nitrogen
(d) chlorine
Answer: (d) chlorine
22. Which of the following is the main disadvantage of hydroponics?
(a) leaching
(b) anoxia
(c) antagonism
(d) contamination
Answer: (b) anoxia
23. Which of the following elements is required by the enzyme kinase?
(a) Iron
(b) Sodium
(c) Potassium
(d) Magnesium
Answer: (d) Magnesium
24. An element needed to reduce nitrate into nitrite is
(a) boron
(b) molybdenum
(c) zinc
(d) iron
Answer: (b) molybdenum
25. Immature leaf of plants fall down due to deficiency of
(a) sulphur
(b) zinc
(c) phosphorus
(d) sodium
Answer: (b) zinc
26. Deficiency of mineral nutrients is not responsible for
(a) shortening of internodes
(b) necrosis
(c) chlorosis
(d) etiolation
Answer: (d) etiolation
27. In the light of carrier concept, the transport of ions across the membrane is a
(a) passive process
(b) active process
(c) non osmotic process
(d) osmotic process
Answer: (c) non osmotic process
28. Which of the following is not an essential macro elements for the growth of plants?
(a) nitrogen
(b) zinc
(c) calcium
(d) potassium
Answer: (b) zinc
29. The soil particles, particularly clay and organic matter in the soil, contain negative charges that attract positively charged ions such as
(a) magnesium ions
(b) calcium ions
(c) potassium ions
(d) all of these
Answer: (d) all of these
30. Cultivation by sand culture is also called
(a) soil-less cultivation
(b) greenhouse effect
(c) photorespiration
(d) protein synthesis
Answer: (a) soil-less cultivation
31. Inorganic nutrients are present in the soil in the form of
(a) molecules
(b) atoms
(c) electrically charged ions
(d) organic compounds
Answer: (c) electrically charged ions
32. Ion carriers are located in
(a) cell wall
(b) intercellular spaces
(c) cell membrane
(d) nucleus
Answer: (c) cell membrane
33. Technique of growing plants without soil in nutrient solution is called
(a) parthenogenesis
(b) hydroponics
(c) aquaculture
(d) tissue culture
Answer: (b) hydroponics
34. The major role of minor elements inside living organisms is to act as
(a) cofactors of enzymes
(b) building blocks of important amino acids
(c) constituent of hormones
(d) binder of cell structure
Answer: (a) cofactors of enzymes
35. The major proportion of the dry weight of plant comprises of
(a) nitrogen, phosphorus and potassium
(b) calcium, magnesium and sulphur
(c) carbon nitrogen and hydrogen
(d) carbon hydrogen and oxygen
Answer: (d) carbon hydrogen and oxygen
36. In which of the following is nitrogen not a constituent?
(a) idioblast
(b) bacteriochlorophyll
(c) invertase
(d) pepsin
Answer: (a) idioblast
37. Boron in green plants assists in
(a) activation of enzymes
(b) acting as enzyme cofactor
(c) photosynthesis
(d) sugar transport
Answer: (d) sugar transport
38. Grey spots of oat are caused by deficiency of
(a) copper
(b) zinc
(c) manganese
(d) iron
Answer: (c) manganese
39. Which pigment is essential for nitrogen fixation by leguminous plants?
(a) anthocyanin
(b) phycocyanin
(c) leghaemoglobin
(d) phycoerythrin
Answer: (c) leghaemoglobin
40. Free living nitrogen fixing bacteria are found in
(a) air
(b) soil
(c) root nodules
(d) none of the above
Answer: (b) soil
41. Which of the following plants cannot fix atmospheric nitrogen directly?
(a) pea
(b) bean
(c) castor
(d) horse gram
Answer: (c) castor
42. Symbiotic nitrogen fixation in root nodules of some leguminous plants is caused by
(a) Rhizobium
(b) Azotobacter
(c) Nitrobacter
(d) Nitrosomonas
Answer: (a) Rhizobium
43. The process of decay of dead organic matter is known as
(a) denitrification
(b) nitrification
(c) nitrogen fixation
(d) ammonification
Answer: (d) ammonification
44. Which one is not a micro element for plants?
(a) copper
(b) zinc
(c) chromium
(d) boron
Answer: (c) chromium
45. Manganese is required for
(a) chlorophyll synthesis
(b) plant cell wall formation
(c) photolysis of water in photosynthesis
(d) nucleic acid synthesis
Answer: (c) photolysis of water in photosynthesis
46. Simultaneous movement of two molecules across a membrane in the same direction is known as
(a) antiport
(b) uniport
(c) symport
(d) biuport
Answer: (c) symport
47. Which of the following is a free living nitrogen fixing bacteria?
(a) Rhizobium
(b) Azotobacter
(c) Frankia
(d) Anabaena
Answer: (b) Azotobacter
48. One of one example of micronutrient is
(a) potassium
(b) sulphur
(c) iron
(d) manganese
Answer: (d) manganese
49. Nitrogen is stored in plants in the form of
(a) protein
(b) starch
(c) ammonia
(d) amino acids
Answer: (a) protein
50. With increase in light intensity, the synthesis of nitrate reductase will
(a) increase
(b) decrease
(c) remain unaffected
(d) none of the above
Answer: (a) increase