megaspore वाक्य
उदाहरण वाक्य
मोबाइल
- Individual plants are either male producing microspores or female producing megaspores.
- These plants have two spore types, megaspores and microspores.
- The megaspore then undergoes megagametogenesis to give rise to the female gametophyte.
- Megaspores are gray or black, 350-480 ?m in diameter.
- A megasporocyte inside a megasporangium or ovule undergoes meiosis, producing four megaspores.
- Only one is a functional megaspore whereas the others stay dysfunctional or degenerate.
- The megaspores become megagametophytes ( embryo sacs ).
- This type of megagametophyte develops from the megaspore through three rounds of mitotic divisions.
- The best way to identify them is by examining the megaspores under a microscope.
- The megaspore that remains divides nuclei that later merge to make a diploid nucleus.
- Three cells die and one that is most distant from the micropyle develops into the megaspore.
- The plants are heterosporous with spores of two different size classes, known as megaspores and microspores.
- Heterosporic plants, as their name suggests, bear spores of two sizes microspores and megaspores.
- Since an individual female spore is considerably larger than a male spore, it is termed a megaspore.
- This megaspore becomes larger and the nucleus of it undergoes mitosis three times until there are eight nuclei.
- Plants with heterosporous life cycles using microspores and megaspores arose independently in several plant groups during the Devonian period.
- In heterosporous organisms, two types of spores exist : microspores give rise to males and megaspores to females.
- The transition to ovules continued with this megaspore being " boxed in " to its sporangium while it germinates.
- As with all seed-plants, the lyginopteridalean ovules had just one functional seed megaspore within the nucellus.
- The surviving one develops as a megaspore and divides repeatedly to form an immature female gametophyte ( egg sac ).
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