Initial seed of an improved variety is called as:

Correct option is B

✅ (b) Nucleus seed: • This is the first and purest seed produced by the breeder. • It is 100% genetically pure and maintained under strict conditions. • Forms the base material for producing breeder seed.
❌ (a) Breeder seed: • Produced from nucleus seed, not the initial one.
❌ (c) Foundation seed: • Comes after breeder seed in the seed multiplication chain.
❌ (d) Certified seed: • Final seed used by farmers, far from the initial seed stage.