Question

Seed plants are all ______________.
A. Heterosporous
B. Dioecious
C. Monoecious
D. Homosporous

Answer 1

Hint: Spermatophytes are seed-producing plants. A seed is an embryonic plant with a protective coating around it. Seed development is a component of the reproductive process of seed plants, known as spermatophytes, which include gymnosperm and angiosperm plants. After pollen fertilisation and some development within the mother plant, the mature ovule produces seeds. The zygote produces the embryo, while the integuments of the ovule produce the seed coat.

Complete solution:
Let us solve this question by discussing each and every option.
Option:A - The state of generating two types of spores, megaspores and microspores, is known as heterospory. All seed-bearing plants, including gymnosperms and angiosperms, have heterospory.
So, Option:A is correct.
Option:B - Dioecy in plants refers to the presence of staminate and pistillate blooms on separate individuals. There are many seeded plants which are not dioecious.
So, Option:B is incorrect.
Option:C – Monoecious plants are those which bear both male and female reproductive structures on the same plant. This is not an obligatory characteristic of seeded plants as many seed-bearing plants are dioecious.
So, Option:C is incorrect.
Option:D - Homosporous plants generate just one type of spore, whereas seeded plants do not generally exhibit this trait.
So, Option:D is incorrect.

Hence the correct answer is option A. Heterosporous.

Note:
Heterospory is thought to be a need for seed production; however, in addition to heterospory, seed plants exhibit the following traits, which have resulted in seed formation. The sporangia of ferns are more specialised than those of sporangia. Micro and large sporangia are two types of sporangia. Each microsporangium has a high number of microspores, whereas megasporangium has only four megaspores.