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.
Does pH influence the enzyme activity?
What are the ways by which the syringe management program, tries to provide education to the society?
What do DNA sequence databases contain?
Main portions of eukaryotic cell: The eukaryotic cell can be split into two main parts: the cell membrane which separates the intra-cellular space from the outer space physically delimiting the cell; the cytoplasm that is the interior part filled with
What are the illustrations of a carnivorous and herbivorous reptile? Answer: The Snakes are carnivorous and Iguanas are herbivorous.
A 35-year old woman has been chosen for the hysteroscopy. What are the signs for hysteroscopy in a woman of this age?
Write down the difference between cross pollination and self pollination? Which of these two modes of pollination contributes more to the plant diversity?
Classify the excretory system of molluscs?
Techniques of Scientific Management Time Study : Time study is the technique used to measure the time that may be take
Why do plants require exchanging gases with environment?
18,76,764
1942719 Asked
3,689
Active Tutors
1450285
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!