Opt b coz some pteridiophytes (sellaginella salvinia) all gymnosperms nd angiosperms r heterosporous I.e produce 2 different types of spores i.e either male r female spores but not both . As wkt gametophyte develops from spores so it will be always either a male gametophyte r female gametophyte (dioecious)not monoecious . so we wont observe monoecious gametophyte. I think it may help u.

In angiosperms, the presence of both male and female reproductive structures in the same individual plant is a common characteristic. This condition is referred to as monoecious. However, there are exceptions to this general rule, and some angiosperms exhibit dioecious characteristics, where the male and female reproductive structures are present on separate individual plants.

Let's explore the options given:

A) Dioecious gametophytes: In angiosperms, the gametophytes are microscopic structures that develop within the reproductive organs of the sporophyte generation. In general, angiosperms have a reduced gametophyte stage, and it is the sporophyte stage that dominates the life cycle. In dioecious angiosperms, the male and female gametophytes develop in separate plants. This means that the male gametophytes are present in the male plants, and the female gametophytes are present in the female plants. So, dioecious gametophytes are observed in angiosperms.

B) Monoecious gametophytes: As mentioned earlier, angiosperms are generally monoecious, meaning that both male and female reproductive structures are present in the same individual plant. Therefore, monoecious gametophytes are observed in angiosperms.

C) Dioecious sporophytes: The sporophyte generation in angiosperms is the dominant phase of the life cycle, and it is the stage that we typically recognize as the plant itself. In dioecious angiosperms, the male and female reproductive structures develop on separate individual plants. Therefore, dioecious sporophytes are observed in angiosperms.

D) Monoecious sporophytes: As mentioned earlier, angiosperms are generally monoecious, meaning that both male and female reproductive structures are present in the same individual plant. Therefore, monoecious sporophytes are observed in angiosperms.

In conclusion, the correct answer is A) Dioecious gametophytes, as dioecious gametophytes are observed in angiosperms.