Is microspore a gametophyte?
Assorted References. … form two kinds of spores: microspores, which give rise to male gametophytes, and megaspores, which produce female gametophytes.
What is the Definition of microspore?
Definition of microspore : any of the spores in heterosporous plants that give rise to male gametophytes and are generally smaller than the megaspore.
What is microspore in plant?
Microspores are land plant spores that develop into male gametophytes, whereas megaspores develop into female gametophytes. The male gametophyte gives rise to sperm cells, which are used for fertilization of an egg cell to form a zygote.
What is a microspore quizlet?
microspore. A spore from a heterosporous plant species that develops into a male gametophyte.
What is the difference between microspore and male gametophyte?
The key difference between microspore and pollen grain is based on the gametophyte. That is; the microspore develops into the male gametophyte while the pollen grain contains the male gametophyte. Furthermore, microspores develop only via meiosis, whereas pollen grains develop via meiosis and then undergo mitosis.
What’s the Definition of gametophyte?
Medical Definition of gametophyte : the individual or generation of a plant exhibiting alternation of generations that bears sex organs — compare sporophyte.
What sporophyte means?
Definition of sporophyte : the diploid multicellular individual or generation of a plant with alternation of generations that begins from a diploid zygote and produces haploid spores by meiotic division — compare gametophyte.
What is microspore describe the structure of microspore?
Structure of microspore: Pollen grain/microspore is a non-motile, haploid, unicellular body with a single nucleus. It is surrounded by a two-layered wall called sporoderm. The outer wall is called exine and the inner wall is called intine.
How does a microspore become pollen?
The cells of sporogenous tissues undergo meiotic division to form microspore tetrad. As the anther mature and dehydrate, the microspore dissociate and develops into pollengrains. The pollen grain represents the male gametophytes.
Why sporophyte is dominant in pteridophytes?
Zygote or fertilized egg experiences mitotic division forming the different segments such as roots, stem, sporophyte and later on spores, which are again formed via meiosis and dispersed and hence the cycle goes on. Thus, the dominant phase is sporophyte in pteridophytes.
Which of the following produces microspores that develop into pollen grains?
One type of cone is the small pollen cone, which produces microspores that subsequently develop into pollen grains. The other type of cones, the larger “ovulate” cones, make megaspores that develop into female gametophytes called ovules.
What is the difference between sporophyte and gametophyte?
Through the process of meiosis and fertilization, the alternation of generation segregates these two phases into the sporophyte and gametophyte. To clearly understand the plant’s life cycle, sporophyte is the phase when plants produce diploid (2n) spores, which in turn [spores] develop into gametophytes.
What is sporophyte in plant life cycle?
To clearly understand the plant’s life cycle, sporophyte is the phase when plants produce diploid (2n) spores, which in turn [spores] develop into gametophytes. During the gametophyte stage, haploid (n) gametes or reproductive cells such as sperm and eggs are developed. The eggs are fertilized by sperm and grow into sporophytes.
What are microspores and megaspores in plants?
In seed plants the microspores develop into pollen grains each containing a reduced, multicellular male gametophyte. The megaspores, in turn, develop into reduced female gametophytes that produce egg cells that, once fertilized, develop into seeds.
How is sporophyte formed in megaspore?
The nucleus of the megaspore undergoes mitosis to produce the egg cells that will start the sporophytic generation: two synergid cells, a large central cell, and three antipodal cells. In vascular seed-bearing plants, the sporophyte is made of the entire body of the plant except for the embryo sac and pollen.