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.
Which cell organelles participate in cell division and in formation of cillia and flagella of the eukaryotic cells?
Explain these in detail, What is a goiter? Illustrate endemic goiter? How to solve this problem socially?
Describe what is the role of MR?
Project Lifecycle: It is a seven stage process via which practically every major project goes via: (A) Identification: stage where one project-idea out of a number of alternatives is selected and stated. (B) Preparation: stated idea is cautiously deve
Intellectual Property: This refers to creations of the mind: inventions, artistic and literary works, and symbols, images, names, and designs employed in commerce. IP is divided into two groups: Industrial property
Name the first human heart chamber into which the blood enters? Where does the blood go subsequent to passing that chamber? Give the name of valve which separates the compartments? Why is that valve essential?
Give a brief explanation of cytoplasmic inclusions.
Describe vision? Why is vision significant for life on earth?
What is latent or inductive period?
Why uricotelic excretion is necessary for the avian and reptile embryos?
18,76,764
1944867 Asked
3,689
Active Tutors
1429980
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!