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.
Pharmacokinetics is the study of drug delivery through absorption/dispersion into the body, distribution around the body and elimination or excretion out of the body. Drug delivery into a body depends on numerous factors. These include:
Explain the difference between the tracheophytes and bryophytes?
What are the positional modifications in pain noted by patients with pericarditis?
Define the term hemoglobin F? Why does fetus require different hemoglobin?
What preventive measures must be taken for Malaria?
Explain the term Sperm. Also describes its structures with the help of diagram.
Describe some functions of pantothenic acid and biotin for the body? How are such vitamins obtained?
Firms are realizing that utilizing diversity an all aspects of the workforce makes not only a strong moral sense but also business sense. By ensuring that diversity is built into various groups of members, such as project teams, business start-up teams, customer response teams, sales force and to
Name some human diseases caused by the fungi?
Is the stage when insect larva is in a cocoon a stage of the total biological inactivity?
18,76,764
1932935 Asked
3,689
Active Tutors
1434193
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!