The correct answer is (d) (ii) and (iv).
Explanation:
(ii) They are the sexual reproductive organs:
This is true. Flowers are the specialized reproductive organs of angiosperms (flowering plants) where male and female reproductive parts are located.
(iv) After fertilization they give rise to fruits:
After fertilization, the ovary of the flower develops into a fruit, which protects the developing seeds.
(i) Flowers are always bisexual:
This is not true. While many flowers are bisexual (containing both male and female reproductive parts), some flowers are unisexual (having only male or female parts).
(iii) They are produced in all groups of plants:
This is false. Flowers are only produced in angiosperms. Other groups of plants, like gymnosperms, bryophytes, and pteridophytes, do not have flowers.
Therefore, only statements (ii) and (iv) are true about flowers.