Why some seeds are used for oil extraction and not all

Question

From my understanding, oil in seed is fat reserve to be used in initial phase of germination. If thats the case why all the seeds don’t have oil.

In: 9

Answer 1

Castor oil was made by crushing castor (French for beaver) nuts (actually some other gland). Thankfully for beavers, it is now made from the seeds of ricinus, a plant.