What are gametophytes and Sporophytes?
Both Gametophyte and Sporophyte are the two Generations of a plant. Gametophyte: Gameto means gametes and phyte means plants. The generation of plants that forms gametes is called gametophyte. Plants produce gametes with the help of their sex organs. The generation of plants that produce spores is called sporophyte.
Is a gametophyte haploid or diploid?
The nonsexual phase is the sporophyte. In the gametophyte phase, which is haploid (having a single set of chromosomes), male and female organs (gametangia) develop and produce eggs and sperm (gametes) through simple mitosis for sexual reproduction.
What is gametophyte and its characteristics?
Characteristics of Gametophytes Gametophytes are haploid plants that use mitosis to make haploid gametes. These gametes are female in the form of an ovum (egg) or male in the form of sperm. Gametophytes contain the archegonium, or female sex organ, or they contain the antheridium, or male sex organ.
Are Sporophytes autotrophic?
The sporophyte is not photosynthetic. The greatest contrast between the mosses and the ferns is that both the gametophyte and the sporophyte of the fern photosynthesize and are thus autotrophic; the shift to a dominant sporophyte generation is taking place.
Does Moss produce sperm?
Some mosses have cups on their tops that produce sperm, these are male plants. The female counterpart has eggs between her overlapping leaves. Water is a necessity for fertilization; as the sperm become mature they have to swim to the eggs to fertilize them.
What are the similarities and differences between Pteridophytes and gymnosperms?
Similarities between Pteridophytes and Gymnosperms Ø Both Pteridophytes and Gymnosperms show alternation of generation with dominant sporophytic generation. Ø In both groups, the sporophyte is differentiated into roots, stem and leaves. Ø The leaves of some gymnosperms (Eg.
Are Gemmae haploid or diploid?
The gemmae are small discs of haploid tissue, and they directly give rise to new gametophytes. They are dispersed from gemma cups by rainfall.
What is the most recognizable Gymnosperm?
Gymnosperms are vascular plants of the subkingdom Embyophyta and include conifers, cycads, ginkgoes, and gnetophytes. Some of the most recognizable examples of these woody shrubs and trees include pines, spruces, firs, and ginkgoes.
Why gymnosperms are called Heterosporous?
Gymnosperms are able to produce male and female cones. This means that both gametes required for fertilization are present, making these groups of plants heterosporous.
Is moss sperm flagellated?
Primitive bryophytes like mosses and liverworts are so small that they can rely on diffusion to move water in and out of the plant. Their flagellated sperm must swim through water to reach the egg. So mosses and liverworts are restricted to moist habitats.