Question

Seed habit originated firstly in some
A.Pteridophytes
B.Pines
C.Monocots
D.Dicots

Answer 1

Hint:We know that plants reproduce both by sexual and asexual reproduction. For sexual reproduction, the fusion of male and female gametes is needed. Flowers are the organs of sexual reproduction. After gamete formation, both male and female gametes fuse together to form a zygote, which later develops into an embryo. In seed plants, the development of the embryo takes place in seeds.

Complete step by step answer:Seed is the final product of sexual reproduction. It has a hard and durable seed coat that helps them to remain in a dormant stage for a long time. Seed habit is seen in plants from pteridophytes. It is not seen in other lower plants.
Pteridophytes are the most advanced flowerless and seedless plants. One must know that they form the largest living group of primitive vascular plants. They are often called the first land plants.
Pteridophytes are shade-loving vascular plants. We know that they are called vascular cryptogams. We call them vascular because they have vascular tissues like xylem and phloem.
The stem of pteridophytes is called rhizomes as it bears roots and leaves on them.
Pteridophytes are divided into different classes. They are Psilopsida, Lycopsida, Sphenopsida, Pteropsida. Psilotum is a pteridophyte which is known as primitive pteridophyte. It is an example of a living fossil fern.
In pteridophytes, the development of the zygote into a young embryo takes place within the female gametophytes. This is the first step towards the evolution of seed habit that is seen in higher plants. Gametophytes produce male and female gametes that fuse to zygote inside the archegonium, which is the female reproductive part of the gametophyte. The zygote formed in this manner grows into a sporophyte that produces spores. Gametophytes are formed by the germination of these spores.
Hence the correct option is A.

Note:We know that the dominant stage in the life cycle of a pteridophyte is the sporophytic stage. It is because gametophyte is not independent. They depend upon sporophyte and the female gametophytes are retained on the sporophyte body for variable periods.