Angiosperms are vascular plants. They are composed of a stem, a root system, and leaves. Answer in its entirety: In gymnosperms, such as Pinus, the male and female gametophyte do not have an autonomous existence where they are free to live on their own.
Answer in its entirety: In gymnosperms (like Pinus), the male and female gametophyte do not have an independent existence where they are free to live on their own.
Is the gametophyte an independent free living generation in gymnosperms?
In gymnosperms (like Pinus), the male and female gametophytes do not have an independent existence where they are free to live on their own.This means that the gametophyte generation is not an autonomous, free-living generation.They do not detach from the sporangia that are still attached to the sporophytes; specifically, the female gametophyte (which is contained within the megasporangium) and the male gametophyte (within microsporangium).
Are seed plant gametophytes independent organisms?
The gametophytes of seed plants are not autonomous creatures; rather, they are dependent on the dominant sporophyte tissue for the provision of nutrition and water. If the gametophyte tissue is severed from the sporophyte tissue, it will not be able to survive on its own. The only exception to this rule is ripe pollen.
Are gametophytes found in heterosporous plants?
There are two separate sporangia present in heterosporous plants, such as water ferns, certain lycophytes, as well as all gymnosperms and angiosperms. Each of these sporangia is responsible for the production of a single type of spore and a single type of gametophyte. On the other hand, not all heteromorphic gametophytes originate from plants that produce heterospores.
What is the difference between male and female gametophyte in gymnosperms?
In gymnosperms (like Pinus), the male and female gametophyte do not have a separate existence that is autonomous and independent from one another. They do not detach from the sporangia that are still attached to the sporophytes; specifically, the female gametophyte (which is contained within the megasporangium) and the male gametophyte (within microsporangium).
Which of the following do not have independent gametophyte?
In gymnosperms, the presence of male and female gametophytes is not independent of one another and does not occur in a free-living state (Pinus). In the megasporangium, they dwell the sporangia on the sporophytes, which are the female gametophytes, while in the microsporangium, they inhabit the male gametes.
Do gymnosperms have independent gametophyte?
In gymnosperms, the male and female gametophytes do not have a separate existence because they are kept within the sporangia that are preserved on the sporophyte. This prevents them from having an independent existence.
In which of the following group gametophyte is not independent Cryptogams?
Therefore, ″Bryophytes and Pteridophytes″ is the response that is right.
Do pteridophytes have independent gametophyte?
It is characterized as a haplo-diplontic life cycle when the diploid sporophyte is represented by a dominant, independent, photosynthetic vascular plant (Bryophytes and pteridophytes), and it is alternated with a multicellular, sporophytic, independent, but short-lived haploid gametophyte.
Do bryophytes have independent gametophyte?
The generations of bryophytes alternate between the independent gametophyte generation, which produces the sex organs as well as sperm and eggs, and the dependent sporophyte generation, which produces the spores. The gametophytes are responsible for reproduction, while the sporophytes are responsible for producing the spores.
Does polytrichum have independent gametophyte?
Gametophytes are free-living generations that are independent in liverworts (Marchantia), mosses (polytrichum), and ferns (Funaria). On the other hand, gametophytes are dependent in gymnosperms and angiosperms.
What is the gametophyte in pteridophytes?
In the life cycle of pteridophytes, the gametophyte represents the haploid stage of development. It begins as a spore that is formed on the sporophyte of the plant. This spore has the potential to germinate and grow into a body known as the prothallus.
What is the gametophyte in bryophytes?
In bryophytes, the gametophyte stage of development predominates over all others. Antheridia and archegonia are the structures that are produced by the gametophyte, and they are responsible for producing male and female gametes, respectively. Gametangia is the collective name for all of these different structures.
In which group of plants do male and female gametophytes not have an independent living existence?
In gymnosperms, the male and female gametophytes do not have an autonomous, free-living existence; instead, they are contained within the sporangia and are kept on the sporophytes.
Which of the following class is not included in cryptogams?
Angiosperms are not classified as Cryptogams, which are plants of the group Cryptogram that do not produce seeds.
Do bryophytes have independent sporophyte?
Within bryophytes, the gametophyte and the sporophyte exist independently of one another. For instance, Marchantia, mosses, liverworts, and other similar organisms. Pteridophytes are the plants that have vascular systems. There are no flowers or seeds produced by pteridophytes.
Is gametophyte Independent in angiosperms?
The primary plant body of Pinus, which is a gymnosperm, as well as mustard and castor, which are both angiosperms, are sporophytes. The gametophyte stage is severely diminished and fully reliant on the sporophyte stage.
Which plant group has independent gametophyte?
In bryophytes, a multicellular diploid sporophyte lives as a parasite on an autonomous multicellular haploid gametophyte that produces multicellular jacketed sex organs. These nonvascular terrestrial plants in damp environments are known as bryophytes.