Micronutrients are elements required by living organisms in small (trace) quantities. In plants, 8 micronutrients are needed; in humans, micronutrients include vitamins (A, B complex, C, D, E, K) and trace minerals. Use the mnemonics below to memorise them quickly for biology exams.
Plant micronutrients (8): B, Zn, Cu, Fe, Mn, Mo, Cl, Ni.
Mnemonic: 'Bade Zor Se Cu-Fe Mangan Mola ChloraNi' (B Zn Cu Fe Mn Mo Cl Ni).
Plant macronutrient mnemonic: 'C HOPKINS CaFe Mg'.
Fat-soluble vitamins: A, D, E, K — mnemonic 'ADEK' or 'All Dogs Eat Kibble'.
Water-soluble vitamins: B complex (B1–B12) and Vitamin C.
NCERT Class 11 Biology Ch 12 (Mineral Nutrition) and Ch 16 (Digestion).
PART 1: Plant Micronutrients (8 Elements)
The 8 micronutrients required by plants: Boron (B), Zinc (Zn), Copper (Cu), Iron (Fe), Manganese (Mn), Molybdenum (Mo), Chlorine (Cl), Nickel (Ni)
Mnemonic 1 (English): 'Bo Zn CuFe MnMo ClNi' → 'BoZinc CuFe ManMo ChlorNi'
Mnemonic 2 (Hindi-English mix): 'Bade Zor Se Cu-Fe Mangan Mola ChloraNi' (Boron Zinc Copper Iron Manganese Molybdenum Chlorine Nickel)
Mnemonic 3 (Short sentence): 'Boys Can Find Many More Clues Nicely' B - Boron C - Copper F - Iron (Fe) Mn - Manganese Mo - Molybdenum Cl - Chlorine Ni - Nickel (+ Zn - Zinc)
Plant Micronutrients Table:
| Element | Symbol | Function |
|---|---|---|
| Boron | B | Cell wall formation; pollen germination |
| Zinc | Zn | Enzyme activation; auxin synthesis |
| Copper | Cu | Photosynthesis; enzyme cofactor |
| Iron | Fe | Chlorophyll synthesis; electron transport |
| Manganese | Mn | Photosynthesis; enzyme activation |
| Molybdenum | Mo | Nitrogen fixation (nitrogenase enzyme) |
| Chlorine | Cl | Osmosis; photosynthesis |
| Nickel | Ni | Urease enzyme; nitrogen metabolism |
Plant Macronutrients (for contrast — 6 major + C, H, O): • Carbon (C), Hydrogen (H), Oxygen (O) — from air/water • Nitrogen (N), Phosphorus (P), Potassium (K), Calcium (Ca), Magnesium (Mg), Sulphur (S) Mnemonic: 'C Hopkins CaFe Mg' (C H O P K I N S Ca Fe Mg)
PART 2: Human Micronutrients
Vitamins: • Fat-soluble: A, D, E, K → 'ADEK' • Water-soluble: B complex (B1, B2, B3, B5, B6, B7, B9, B12), C
Mnemonic for fat-soluble vitamins: 'All Dogs Eat Kibble' = A, D, E, K
Key mineral micronutrients for humans: Iodine (I), Iron (Fe), Zinc (Zn), Fluoride (F), Selenium (Se), Copper (Cu), Manganese (Mn), Chromium (Cr), Molybdenum (Mo), Cobalt (Co)
Mnemonic: 'I Iron Zinc Fluoride Se Cu Mn Cr Mo Co' → 'I FaZe CuMnCr MoCo' (informal)
Deficiency Diseases (Quick Table):
| Nutrient | Deficiency Disease |
|---|---|
| Vitamin A | Night blindness |
| Vitamin B1 (Thiamine) | Beriberi |
| Vitamin B3 (Niacin) | Pellagra |
| Vitamin B9 (Folic acid) | Anaemia (neural tube defects) |
| Vitamin B12 | Pernicious anaemia |
| Vitamin C | Scurvy |
| Vitamin D | Rickets (children), Osteomalacia (adults) |
| Vitamin K | Poor blood clotting |
| Iron | Anaemia |
| Iodine | Goitre |
| Calcium | Osteoporosis |
NCERT: Class 11 Biology Chapter 12 — Mineral Nutrition (plants); Class 11 Biology Chapter 16 — Digestion and Absorption (human)
The 8 plant micronutrients are: Boron (B), Zinc (Zn), Copper (Cu), Iron (Fe), Manganese (Mn), Molybdenum (Mo), Chlorine (Cl), Nickel (Ni). Mnemonic: 'Bade Zor Se Cu-Fe Mangan Mola ChloraNi' (B Zn Cu Fe Mn Mo Cl Ni). For human fat-soluble vitamins (A, D, E, K): 'All Dogs Eat Kibble'. NCERT Class 11 Biology Chapter 12.
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