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Is selaginella a homosporous or a heterosporous plant?
Selaginella is a heterosporous plant, meaning it produces two types of spores – megaspores and microspores. Megaspores develop into female gametophytes, while microspores develop into male gametophytes.
Is a stamen the site where microspores are produced?
Yes, a stamen is the male reproductive organ of a flower that produces pollen grains containing microspores. The microspores develop into male gametophytes.
Will megaspores divide to form the female gametophyte or the sporophyte?
It will divide to form the female gametophyte.
What is magaspore?
A megaspore is a type of haploid spore produced by some plants that develops into a female gametophyte during sexual reproduction. It is typically larger than microspores, which develop into male gametophytes. Megaspores are an important part of the life cycle of plants that reproduce through alternation of generations.
What is heterospory?
Heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants. Heterospory was evolved from isospory independently by several plant groups in the Devonian period as part of the process of evolution of the timing of sex differentiation. Heterosporic plants produce small spores called microspores which either germinate to become male gametophytes or have reduced male gametophytes packaged within them, and similarly larger spores called megaspores that germinate into female gametophytes, or which have female gametophytes packaged within them.
Are all spores in the same sporangium similar?
no selaginella has megaspores and microspores
What plants produce separate male and female cones that produce microspores and megaspores that develop into male and female gametophytes?
Gymnosperms, such as pine trees, produce separate male and female cones that produce microspores and megaspores. These microspores and megaspores develop into male and female gametophytes, which contain the sperm and egg cells for reproduction.
Is selaginella a homosporous or a heterosporous plant?
Selaginella is a heterosporous plant, meaning it produces two types of spores – megaspores and microspores. Megaspores develop into female gametophytes, while microspores develop into male gametophytes.
What type of spores do selanginella produces?
Selaginella plants produce spores called microspores and megaspores. Microspores give rise to male gametophytes, while megaspores develop into female gametophytes. These spores are produced in sporangia located on the underside of their reproductive structures called strobili.
What is the difference between megasporangia and microsporangia?
feature mega micro size large small produce megaspore, microspores female gametophyte male gametophyte no.pf spores 4 megaspores numerous microspores
Compare the male and female spores of a conifer?
The female spores of a conifer are called megaspores or macrospores. Megaspores develop into a female gametophyte, producing egg cells. Male spores of a conifer are called microspores and are formed from meiosis. Microspores develop into the male gametophyte, which produces sperm cells.
Why is heterospory considered an important step towards seed habit?
Heterospory is important for the evolution of the seed habit because it allows for the production of two distinct types of spores - microspores and megaspores. Microspores develop into male gametophytes while megaspores develop into female gametophytes. This separation of male and female gametophytes is a key feature in the development of seeds and is more efficient for reproduction than homospory.
Haploid reproductive cells are called?
The four cells formed as a result of meiosis are called daughter cells.
What is the ploidy level of the micropyle?
The micropyle is a hole in the seed coat, it is literally nothing. Hence it is not made of cells and has no chromosomes.
Contrast microspores and megaspores?
Microspore = male gamete (n)Megaspore = female gamete (n) Micro develops in the anther and undergoes mitosis to create pollenMega develops in the ovule, retained in ovary, and undergoes mitosis to create female gametophyte (ultimately, an egg).
What is the difference between staminate and ovulate cones?
A staminate cone contains the male reproductive structures that produce microspores.An ovulate cone contains the female reproductive structures that produce megaspores.
What are heterosporous genera?
Heterosporous genera are plant genera that produce two types of spores: microspores (male) and megaspores (female). Examples include Selaginella, Isoetes, and Marsilea in the plant kingdom. This heterospory allows for the development of separate male and female gametophytes, enhancing reproductive success and evolutionary adaptability.
