what the mean of orthodox and recalcitrant seed?

Answer 1

Recalcitrant seeds are seeds that do not survive drying and freezing during ex-situ conservation. Moreover, these seeds cannot resist the effects of drying or temperatures less than 10° C thus they cannot be stored for long periods like orthodox seeds because they can lose their viability.
Orthodox seeds acquire desiccation tolerance during development and may be stored in dry state for predictable period under defined conditions.

Answer 2

Recalcitrant Means

Answer 3

Meaning Of Recalcitrant