DOWNLOAD MOBILE APPLICATION TO LEARN MORE: Mineral Nutrition in plants
DOWNLOAD MOBILE APPLICATION TO LEARN MORE: Mineral Nutrition in plants
Mineral Nutrition is known as a naturally occurring inorganic nutrient. It can be found in the soil and food and it is vital for the able functioning of animal and plant bodies. Minerals are the vital elements which allow a body to grow and to survive. Minerals are essentially needed by both plants and animals. For example zinc is needed for cell division and for the production of protein.
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Role of Nutrients
- Balancing Function: Some salts or minerals act against the harmful effects of the other nutrients hence balance the effect of each other.
- Maintenance of Osmotic Pressure: In few minerals the cell sap is present in organic or inorganic form, to control the organic pressure of the cell.
- Influencing The pH of The Cell Sap: Different anions and cations have different influences on the pH of the cell sap.
- Construction of The Plant Body: Some of the elements which help to construct the plant body are Carbon, Nitrogen and Oxygen. They help by entering the protoplasm and constitution of the wall.
- Catalysis of The Biochemical Reaction: Zinc, magnesium, calcium, and copper act as metallic catalysts in biochemical reactions.
- Effects of Toxicity: Under specific conditions, minerals like arsenic and copper have a toxic effect on the protoplasm.
Micronutrients
- Micronutrients are the nutrients required by plants in very small proportions. Some of them are Boron, iron, chlorine, and molybdenum are some of the examples of micronutrients.
Macronutrients
- Macronutrients are the nutrients required by plants in larger proportions. These may include sulfur, nitrogen, carbon, phosphorus, calcium, potassium, and magnesium.
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Table of Contents
Mineral Nutrition in plants
1. Which one of the following roles is not the characteristic of an essential element?
(a) Being a component of biomolecules.
(b) Changing the chemistry of soil.
(c) Being a structural component of energy related chemical compounds.
(d) Activation or inhibition of enzymes.
Answer :- B
2. Which one of the following statements can best explain the term critical concentration of an essential element?
(a) Essential element concentration below which the plant growth is retarded.
(b) Essential element concentration below which the plant growth becomes stunted.
(c) Essential element concentration below which the plant remains in the vegetative phase.
(d) None of these
Answer :- A
3. Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms?
(a) Sulphur (b) Magnesium
(c) Nitrogen (d) Potassium
Answer :- A
4. Which one of the following symptoms is not due to manganese toxicity in plants?
(a) Calcium translocation in shoot apex is inhibited
(b) Deticiency in both Iron and Nitrogen is induced
(c) Appearance of brown spot surrounded by chlorotic veins.
(d) None of these
Answer :- B
5. Reaction carried out by N, metabolising microbes include
(A) 2NH3, + 302, à 2NO2, +2H+ + 2H2O (I)
(B) 2NO2 + O2 à 2NO3 (II)
Which of the following statements about these equations is not true?
(a) Step (I) is carried out by Nitrosomonas of Nitrococcus
(b) Step (ii) is carried out by Nitrobacter
(c) Both steps (i) and (ii) can be called nitrification
(d) bacteria carrying out these steps are usually photoautotrophs.
Answer :- D
6. With regard to the Biological Nitrogen Fixation by Rhizobium in association with soyabean, which one of the following statement/statements does not hold true
(a) Nitrogenase may require oxygen for its functioning
(b) Nitrogenase is Mo-Fe protein
(C) Leg-haemoglobin is a pink coloured pigment
(d) Nitrogenase helps to convert N2 gas into two molecules to ammonia.
Answer :- A
7. Match the element with its associated functions/roles and choose the correct among given below.
| (A) Boron | (i) Splitting of H2O to liberate O2 during photosynthesis |
| (B) Manganese | (ii) Needed for synthesis of auxins |
| (C) Molybdenum | (iii) Component of nitrogenise |
| (D) Zinc | (iv) Pollen germination |
| (E) Iron | (v) Component of ferredoxin |
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Options:
(a) (A) – (i), (B) – (ii), (C) – (iii), (D) – (iv), (E) – (v)
(b) (A) – (iv), (B) – (i), (C) – (iii), (D) – (ii), (E) – (v)
(c) (A) – (iii), (B) – (ii), (C) – (iv), (D) – (v), (E) – (i)
(d) (A) – (ii), (B) – (iii), (C) – (v), (D) – (i), (E) – (iv)
Answer :- B
8. Plants can be grown in (Tick the incorrect option)
(a) Soil with essential nutrients
(b) Water with essential nutrients
(c) Either water or soil with essential nutrients
(d) Water or soil without essential nutrients
Answer :- D
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ALSO VISIT:
+2 BIOLOGY
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