NABARD Grade A • NABARD Grade B • IBPS AFO • FCI AGM
⚡ Quick Answer & AI Exam Snapshot (TL;DR)
Seed Production & Technology is a guaranteed 2-to-3 question topic in every NABARD Grade A Prelim and Mains paper. India follows a 3-Tier (Breeder -> Foundation -> Certified) seed multiplication chain under the Seeds Act, 1966. Every aspirant must memorize the 5 Classes of Seeds and their official Tag Colours (Nucleus: No Tag, Breeder: Golden Yellow, Foundation: White, Registered: Purple, Certified: Azure Blue, Truthfully Labelled: Opal Green), Real Value of Seed formula (Purity % x Germination % / 100; min 75%), Isolation Distances, Minimum Germination Standards (Maize 90%, Wheat/Barley 85%, Rice/Sesame 80%, Groundnut/Soybean 70%, Cotton 65%), and Tetrazolium (TZ) Viability Test.
1. The 5 Classes of Seeds, Tag Colours, Tag Sizes & Genetic Purity (#1 NABARD Question!)
Memorize every cell of this table—at least 1 direct question on Seed Tag Colour, Tag Size, or Progeny relationship appears in NABARD Grade A every single year:
| Class of Seed | Progeny Of & Produced By | Genetic Purity (%) | Official Tag Colour & Tag Size (cm) | Certification Required? |
|---|---|---|---|---|
| 1. Nucleus Seed | Initial handful of genetically pure seed produced personally by the Originating Plant Breeder at the research institute. | 100% | NO TAG (Breeder’s own lab stock certificate) | No agency certification; supervised by Originating Breeder. |
| 2. Breeder Seed | Progeny of Nucleus Seed; produced by the Originating/Sponsored Plant Breeder at ICAR / SAU farms (monitored by ICAR-NSC team). | 100% | GOLDEN YELLOW Tag Size: 12 cm × 6 cm |
Exempt from Seed Certification Agency; monitored by Breeder & ICAR. |
| 3. Foundation Seed (“Mother Seed”) |
Progeny of Breeder Seed (or Foundation Stage-I to Stage-II); produced by NSC, State Farms Corporation, and State Seed Corporations. | 99.5% | WHITE Tag Size: 15 cm × 7.5 cm |
YES — Certified by State Seed Certification Agency (SSCA). |
| 4. Registered Seed | Progeny of Foundation Seed (or Registered Seed); omitted in India’s standard 3-generation system (Breeder → Foundation → Certified). | 99.0%+ | PURPLE (or Orange) Tag Size: 15 cm × 7.5 cm |
Certified by SSCA where produced. |
| 5. Certified Seed | Progeny of Foundation Seed (or Registered Seed); distributed directly to Farmers for commercial crop production! | 99.0% (98% for Hybrids) |
AZURE BLUE Tag Size: 15 cm × 7.5 cm |
YES — Certified by SSCA (Validity: 9 MONTHS from test date, extendable by 6 MONTHS on re-testing!). |
| 6. Truthfully Labelled (TL) Seed | Produced by private/public seed companies tested in their own labs for physical purity & germination (Labeling is compulsory, certification is voluntary!). | Meets notified minimum standards | OPAL GREEN Tag Size: 15 cm × 10 cm |
No SSCA certification, but Seed Inspectors test samples under the Seeds Act, 1966. |
2. Real Value of Seed, Dockage, Seed Index vs Test Weight & Viability Tests
1. Real Value of Seed (Utility Percentage) Formula:
Exam Rule: Any seed lot having a Real Value of less than 70%–75% is generally rejected as unfit for sowing!
Real Value of Seed (%) = [ Purity Percentage (%) × Germination Percentage (%) ] / 100Exam Rule: Any seed lot having a Real Value of less than 70%–75% is generally rejected as unfit for sowing!
2. Pure Live Seed (PLS) Adjusted Seed Rate:
Actual Seed Rate Required (kg/ha) = (Recommended Seed Rate / Real Value %) × 100
3. Dockage (Impurity Percentage):
The percentage of total impurities (inert matter, weed seeds, other crop seeds, broken seeds less than half the original size) present in a seed lot.
4. Test Weight vs Seed Index (#1 Trap in NABARD!):
• Test Weight: Weight of 1,000 Seeds (Used for small-seeded crops: e.g., Rice = 25 g [Basmati Rice = 21 g], Wheat = 40 g, Phalaris minor [weedy mimic of wheat] = 2 g, Pearl Millet = 5–7 g, Mustard = 3–5 g).
• Seed Index: Weight of 100 Seeds (Used for bold/large-seeded crops: e.g., Chickpea/Kabuli Gram, Maize, Groundnut, Soybean, Rajmash, Cotton!).
Seed Viability, Dormancy-Breaking & Vigour Tests:
- Tetrazolium (TZ) Biochemical Test (Lakon, 1942): Uses a 0.5% to 1.0% colourless solution of
2,3,5-Triphenyl Tetrazolium Chloride (TTC). Dehydrogenase enzymes in living (viable) embryo cells reduce colourless TTC into a bright RED compound called Formazan within 2–4 hours (Known as the Quick Viability Test!). - Grow-Out Test (GOT): Field test conducted to determine the Genetic Purity (True-to-Type %) of hybrid/foundation seeds (mandatory for Cotton, Castor, Brinjal, and Bajra hybrids).
- Breaking Seed Dormancy:
- Scarification: Mechanical rubbing or acid treatment (conc. H₂SO₄ in Cotton/Legumes) to break a hard, impermeable seed coat.
- Stratification: Chilling moist seeds at low temperature (2°C to 8°C for 2–7 days) to break physiological embryo dormancy (temperate fruits/rosaceous seeds).
- Chemical Hormones & KNO₃: Gibberellic Acid (GA₃ — 100 to 500 ppm), Potassium Nitrate (KNO₃ — 0.2%, most widely used in seed testing labs!), and Thiourea (1% — specifically used to break dormancy in Potato tubers!).
3. Minimum Germination %, Physical Purity %, Isolation Distances & Seed Legislation
| Crop | Minimum Germination % (Indian Minimum Seed Certification Standards — IMSCS) |
Minimum Physical Purity % | Isolation Distance for Foundation Seed vs Certified Seed (in Metres) |
|---|---|---|---|
| 1. Maize (Hybrid / Composite) | 90% (Highest among field crops!) | 98% | 400 m (Foundation) | 200 m (Certified) |
| 2. Wheat, Barley, Oats & Chickpea (Gram) | 85% | 98% | 3 m (Foundation) | 3 m (Certified) (150 m if loose smut infection is present in Wheat!) |
| 3. Rice (Paddy), Sorghum (Var.), Sesame, Mustard, Lucerne, Berseem | 80% | 98% (Sesame/Mustard: 97%) | Rice: 3 m (F) & 3 m (C) (Hybrid Rice: 200 m [F] & 100 m [C]) |
| 4. Pearl Millet (Bajra), Pigeonpea (Arhar), Moong, Urad, Cowpea, Sunflower | 75% | 98% | Bajra Hybrid: 1,000 m (F) & 200 m (C) Pigeonpea: 250 m (F) & 100 m (C) |
| 5. Groundnut, Soybean, Castor & Okra (Bhindi) | 70% (Okra: 65%) | 96%–98% (Soybean: 98%, Groundnut: 96%) | Groundnut & Soybean: 3 m (F) & 3 m (C) Okra: 400 m (F) & 200 m (C) |
| 6. Cotton (Varieties / Hybrids) & Chilli / Brinjal | 65% (Lowest among major field crops — Cotton!) | 98% | Cotton: 50 m (F) & 30 m (C) |
Landmark Seed Institutions & Legislation Timeline in India:
- 1960: ISTA (International Seed Testing Association) formed earlier in 1924 (HQ: Zurich/Switzerland); 1961 declared FAO International Seed Year.
- 1963 (March): National Seeds Corporation (NSC) established in New Delhi.
- 1966: The Seeds Act, 1966 passed by Parliament (came into force on 2nd October 1969; Seed Rules framed in 1968). Under India’s Seeds Act, 1966, Seed Certification is VOLUNTARY, while Truthful Labelling of notified varieties is COMPULSORY!
- 1983: Seeds (Control) Order, 1983 issued under Essential Commodities Act, 1955 (declared seeds an essential commodity requiring dealer licensing).
- 2001: Protection of Plant Varieties and Farmers’ Rights (PPV&FR) Act, 2001 (Authority HQ: New Delhi; protects breeders’ and farmers’ rights for 18 years for trees/vines and 15 years for other field crops!).
- Seed Replacement Rate (SRR): Percentage of total cropped area sown with certified/quality seeds rather than farm-saved seeds. Ideal target SRR: 33% for Self-Pollinated Crops (Rice, Wheat, Groundnut), 50% for Cross-Pollinated Crops (Maize, Bajra, Sunflower), and 100% for Hybrids every single year!
🎯 High-Yield Exam One-Liners (Last-Minute Revision Box)
- Botanically, a ‘Seed’ is a fertilized, matured ovule consisting of an embryonic plant, food store (endosperm/cotyledons), and protective seed coat (testa).
- India follows a 3-Generation Seed Multiplication Chain: Breeder Seed -> Foundation Seed -> Certified Seed.
- Official Tag Colours: Breeder Seed = Golden Yellow (12 × 6 cm); Foundation Seed = White (15 × 7.5 cm); Registered Seed = Purple (15 × 7.5 cm); Certified Seed = Azure Blue (15 × 7.5 cm); Truthfully Labelled (TL) Seed = Opal Green (15 × 10 cm).
- Foundation Seed is known as ‘Mother Seed’ because it is the source of all certified commercial seed classes.
- Validity period of a Seed Certification Tag in India is 9 MONTHS from the date of test, and it can be revalidated for 6 MONTHS at a time if the lot still meets germination standards.
- Real Value of Seed = (Purity % × Germination %) / 100; a seed lot with Real Value below 70%–75% is unfit for sowing.
- Weight of 1,000 seeds is called ‘Test Weight’ (e.g., Rice = 25g, Basmati = 21g, Wheat = 40g, Phalaris minor = 2g); Weight of 100 bold seeds is called ‘Seed Index’ (e.g., Gram, Maize, Groundnut).
- Among major agricultural field crops, MAIZE has the HIGHEST minimum germination standard (90%), while COTTON has the LOWEST minimum germination standard (65%).
- Minimum Germination Standards: Maize (90%) > Wheat/Barley/Gram (85%) > Rice/Mustard/Sesame (80%) > Bajra/Arhar/Moong/Sunflower (75%) > Groundnut/Soybean (70%) > Cotton (65%).
- For strictly self-pollinated crops like Rice, Wheat, Groundnut, and Soybean, the minimum Isolation Distance is just 3 METRES for both Foundation and Certified Seed.
- In the Tetrazolium (TZ) Biochemical Viability Test, 2,3,5-Triphenyl Tetrazolium Chloride reacts with dehydrogenase enzymes in living cells to produce a red compound called ‘Formazan’.
- ‘Grow-Out Test’ (GOT) is conducted to verify the ‘Genetic Purity (True-to-Type)’ of a seed lot.
- 1% Thiourea solution is used specifically to break dormancy in fresh Potato tubers; 0.2% KNO₃ and GA₃ are the most common dormancy breakers in seed testing laboratories.
- National Seeds Corporation (NSC) was established in 1963; the Seeds Act was enacted in 1966 and came into force on 2 October 1969.
- Under the Seeds Act, 1966 in India, Seed Certification is VOLUNTARY, while Truthful Labelling is COMPULSORY.
- Ideal Seed Replacement Rate (SRR) is 33% for Self-Pollinated crops, 50% for Cross-Pollinated crops, and 100% for Hybrids.
- Orthodox Seeds (cereals, pulses) can be dried to low moisture (<5%–8%) and stored at sub-zero temperatures for decades; Recalcitrant Seeds (Mango, Litchi, Jackfruit, Rubber, Cocoa, Coconut, Tea) die if dried below 20%–30% moisture or frozen!
📝 UPSC & Regulatory Level Practice MCQs (With Detailed Solutions)
Q1. Match the classes of seed in List-I with their official Certification/Labelling Tag Colours in India in List-II:
List-I: (a) Breeder Seed, (b) Foundation Seed, (c) Certified Seed, (d) Truthfully Labelled (TL) Seed
List-II: (1) White, (2) Azure Blue, (3) Golden Yellow, (4) Opal Green
List-I: (a) Breeder Seed, (b) Foundation Seed, (c) Certified Seed, (d) Truthfully Labelled (TL) Seed
List-II: (1) White, (2) Azure Blue, (3) Golden Yellow, (4) Opal Green
Correct Answer: (A) — Breeder Seed carries a Golden Yellow tag (12 × 6 cm) (3); Foundation Seed carries a White tag (15 × 7.5 cm) (1); Certified Seed carries an Azure Blue tag (15 × 7.5 cm) (2); and Truthfully Labelled Seed carries an Opal Green tag (15 × 10 cm) (4). Registered Seed carries a Purple tag.
Q2. A sample of Wheat seed has a Physical Purity Percentage of 95% and a Germination Percentage of 80%. What is the ‘Real Value’ (Utility Percentage) of this seed lot?
Correct Answer: (B) — Real Value of Seed (%) = (Purity % × Germination %) / 100 = (95 × 80) / 100 = 7,600 / 100 = 76.0%.
Q3. According to the Indian Minimum Seed Certification Standards (IMSCS), which of the following pairs of field crops has the HIGHEST (90%) and the LOWEST (65%) minimum germination percentage requirement respectively?
Correct Answer: (B) — Among major agricultural field crops in India, Maize has the highest minimum germination standard at 90%, while Cotton (and Okra) has the lowest at 65% (Wheat = 85%, Rice = 80%, Groundnut/Soybean = 70%).
Q4. In the Tetrazolium (TZ) Quick Biochemical Test for seed viability, which enzyme present in living (viable) embryo cells reduces colourless 2,3,5-Triphenyl Tetrazolium Chloride into a red-coloured compound called ‘Formazan’?
Correct Answer: (B) — Dehydrogenase enzymes active during respiration in living seed tissues release hydrogen ions, which reduce colourless 2,3,5-Triphenyl Tetrazolium Chloride into insoluble red Formazan, staining living embryos red while dead tissues remain unstained.
Q5. What is the difference between ‘Test Weight’ and ‘Seed Index’ in seed technology?
Correct Answer: (B) — Test Weight is the weight in grams of 1,000 seeds (used for small grains like Rice, Wheat, Bajra, Mustard), whereas Seed Index is the weight in grams of 100 seeds (used for bold seeds like Gram, Maize, Groundnut, Soybean).
❓ Frequently Asked Questions (Exam FAQs)
Q: What is the difference between Orthodox Seeds and Recalcitrant Seeds?
Orthodox seeds (such as Rice, Wheat, Maize, Pulses, and most vegetables) tolerate desiccation (drying down to 5%–8% moisture content) and sub-zero freezing temperatures (−20°C in Gene Banks), extending their storage life according to Harrington’s Thumb Rule. Recalcitrant (Unorthodox) seeds (such as Mango, Litchi, Jackfruit, Coconut, Rubber, Cocoa, Coffee, and Tea) are killed if their moisture content drops below 20%–30% or if exposed to freezing temperatures, so they must be sown shortly after harvest or stored via cryopreservation of excised embryos.
Q: Why is the isolation distance for Rice, Wheat, and Groundnut only 3 metres?
Because Rice, Wheat, Groundnut, Soybean, and Chickpea are strictly Self-Pollinated (Autogamous) crops with less than 1% natural cross-pollination. A 3-metre physical gap between adjacent plots is needed merely to prevent mechanical mixing during harvesting, whereas cross-pollinated crops like Maize (400m/200m) and Pearl Millet hybrids (1,000m/200m) require large isolation distances to prevent wind/insect pollen contamination.
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