NEET-Optimised Memory Aids

1. Macronutrients (9 elements): "C HON'S Pick CaMP"

• C = Carbon
• H = Hydrogen
• O = Oxygen
• N = Nitrogen
• S = Sulphur
• P = Phosphorus
• K = Potassium (K from Kalium)
• Ca = Calcium
• Mg = Magnesium

2. Micronutrients (8 elements): "For Mangoes, Zinc Cups Mould Bright Colours Nicely"

• Fe = Iron
• Mn = Manganese
• Zn = Zinc
• Cu = Copper
• Mo = Molybdenum
• B = Boron
• Cl = Chlorine
• Ni = Nickel

3. Nitrification Sequence: "NitroSO Makes Nitrite (FIRST); NitroBACTER Makes Nitrate (BACK)"

• Nitrosomonas: $NH_{3}$ → $NO_{2}^{-}$ (first step)
• Nitrobacter: $NO_{2}^{-}$ → $NO_{3}^{-}$ (second step, "back" to nitrate)

4. Mobile vs Immobile Elements: "N-P-K-Mg MOVE (to young tissues) = Old leaves suffer" Mobile: N, P, K, Mg (deficiency = OLD leaves) Immobile: Ca, Fe, S, Mn, B (deficiency = YOUNG leaves) "Ca-Fe-S-Mn-B STAY PUT = Young leaves suffer"

5. Nitrogen Fixation Key Facts: "16 ATP, 8 electrons, Mo-Fe, No $O_{2}$"

• 16 ATP consumed
• 8$e^{-}$ used (6 for $NH_{3}$ + 2 for $H_{2}$)
• Mo-Fe protein (molybdenum-iron)
• No oxygen (irreversible $O_{2}$ inhibition)

6. Nitrogen Fixers — Symbiotic: "RhizoLEGUME, FrankiWOODY"

• Rhizobium → legume root nodules
• Frankia → non-legume woody plants (Alnus, Casuarina)

7. Free-living $N_{2}$ Fixers: "AzotoBACTER = Aerobic, ClostriANAERO = Anaerobic"

• Azotobacter = aerobic free-living
• Clostridium = anaerobic free-living

8. Casparian Strip: "SUBERin in ENDodermis = BLOCKS APOplast"

• Material: Suberin
• Location: Endodermis
• Function: Blocks apoplast

9. Named Diseases: "WHIP MO, CORK B, LITTLE Zn, TIP Ni"

• Whiptail disease = Molybdenum
• Stout stalk/Internal cork = Boron
• Little leaf disease = Zinc
• Leaf tip necrosis = Nickel