Q. Which of the following seeds is not edible?
Answer:
Castor bean
Notes: There are many examples for non-edible oilseed crops such as jatropha tree (Jatropha curcas), karanja (Pongamia pinnata), mahua (Madhuca indica), castor bean seed (Ricinus communis), neem (Azadirachta indica), rubber seed tree (Hevea brasiliensis), tobacco seed (Nicotiana tabacum), rice bran, cotton seed, etc.