Is the sporophyte generation dominant in vascular plants?
Is the sporophyte generation dominant in vascular plants?
Thus, in the higher (i.e., vascular) plants the sporophyte is the dominant phase in the life cycle, whereas in the more primitive nonvascular plants (bryophytes) the gametophyte remains dominant.
Is the sporophyte generation is dominant?
The sporophyte is the dominant generation, but multicellular male and female gametophytes are produced within the flowers of the sporophyte.
Why is the sporophyte the dominant generation?
It produces haploid spores that develop into a gametophyte. The gametophyte then makes gametes that fuse and grow into a sporophyte. In many plants, the sporophyte generation is the dominant generation. This means that the sporophyte is larger and lives longer than the gametophyte generation.
What plants are sporophyte dominant?
An independent sporophyte is the dominant form in all clubmosses, horsetails, ferns, gymnosperms, and angiosperms that have survived to the present day.
Which generation is the dominant in all vascular plants?
the sporophyte generation
In vascular plants, the sporophyte generation is dominant. In seedless vascular plants such as ferns, the sporophyte releases spores from the undersides of leaves. The spores develop into tiny, separate gametophytes, from which the next generation of sporophyte plants grows.
When did sporophytes become dominant?
Two major innovations—seed and pollen—allowed seed plants to reproduce in the absence of water. The gametophytes of seed plants shrank, while the sporophytes became prominent structures and the diploid stage became the longest phase of the lifecycle. Gymnosperms became the dominant group during the Triassic.
What is sporophyte generation?
In plants, the sporophyte generation is that phase in their life cycle that begins with the union of two single-celled haploid gametes. This union of haploid (n) gametes results in the formation of a single-celled diploid (2n) zygote. The zygote germinates and grows by going through a series of mitotic divisions.
Is fern gametophyte or sporophyte dominant?
sporophyte stage
In higher plants like ferns and fern allies, the sporophyte stage is dominant. Gametophytes produce gametes (sperm and eggs) in a special structure called a gametangium (-ia), while sporophytes produce spores in a special structure called a sporangium (-ia).
Which of the following has a dominant gametophyte generation?
Answer and Explanation: The gametophyte is the dominant generation in e) Mosses. In fact, the gametophyte is the dominant generation in all bryophytes, of which all mosses,… See full answer below.
How did the sporophyte generation evolve?
Successively, a group of cells in this diploid phase divided meiotically to form tetrads of spores; thus a larger sporophyte evolved through an increasing sterilization of the sporogeneous tissue and delayed meiosis.
What is meant by dominant generation in plants?
In bryophytes (mosses and liverworts), the dominant generation is haploid, so that the gametophyte comprises what we think of as the main plant. The opposite is true for tracheophytes (vascular plants), in which the diploid generation is dominant and the sporophyte comprises the main plant.
What is the dominant generation of all vascular plants?
In vascular plants, the sporophyte generation is dominant. In seedless vascular plants such as ferns, the sporophyte releases spores from the undersides of leaves. The spores develop into tiny, separate gametophytes, from which the next generation of sporophyte plants grows.