Trends of gametophyte in evolution of plants
Write down the trends of gametophyte in evolution of the plants?
Expert
A propensity of gametophyte evolution in the plants has been towards formation of gametes which are independent from water. In bryophytes and in pteridophytes the fecundation is totally dependent on water. In phanerogamic plants such dependency doesn’t exist.
Another propensity is reduction in the size and period of gametophyte.
In bryophytes the gametophyte is indeed lasting stage. In pteridophytes, gymnosperms and angiosperms it became temporary stage and its relative size was successively decreased.
A third evolutionary trend relates to interdependency between gametophytes and sporophytes. In bryophytes the sporophyte is entirely dependent on the gametophyte to survive. In the remaining plants sporophyte is the independent stage and once autotrophic gametophyte in bryophytes and pteridophytes became dependent upon the sporophyte in phanerogamic plants.
Explain the primary structure of a protein? What is the significance of primary structure?
What occurs when the oxygen supply is inadequate to maintain aerobic cellular respiration throughout muscle exercise?
How aldosterone acts and where it is produced?
What are various diseases characterized by the progressive loss of axonal myelin sheath?
Specify the two reproductive novelties of beings of class Reptilia which allow for the survival within the dry environments?
Explain the ecological role of earthworms?
Describe the term inflammation?
Specify the function of collagen fibers of connective tissue?
Define the term the genetic code? Briefly explain it.
Advantages of using a methodology: It can help to provide direction to the project as a whole It can enable a saving in project timescales It can help to improve the quality of the project deliverables.
18,76,764
1955435 Asked
3,689
Active Tutors
1421979
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!