Final answer:
Germplasm is the term used to describe the seeds, plants, or plant parts useful in crop breeding, research, and conservation efforts.
Step-by-step explanation:
The term used to describe the seeds, plants, or plant parts useful in crop breeding, research, and conservation efforts is germplasm. Germplasm refers to the genetic material of an organism that can be used for reproduction and is vital for maintaining and improving crop diversity. It includes seeds, plant tissues, and other genetic resources that can be stored in gene banks to support crop breeding programs.