Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
What are trends of the gametophyte in the evolution of plants?
The tendency of the gametophyte evolution in plants has been towards the formation of gametes that are self-determining from water. In the bryophytes and in the pteridophytes the fecundation is totally dependent on water. In the phanerogamic plants such dependency doesn't exist.
An additional tendency is the reduction in the size and duration of the gametophyte.
In the bryophytes gametophyte is indeed the lasting stage. In gymnosperms, pteridophytes and angiosperms it became the temporary stage and its relative size was successively reduced.
A third evolutionary trend that is relates to the interdependency between gametophytes and sporophytes. In the bryophytes the sporophyte is completely dependent on the gametophyte to survive. In remaining plants the sporophyte is the independent stage and the once autotrophic gametophyte in the bryophytes and the pteridophytes became dependent upon the sporophyte in the phanerogamic plants.
what are the two main pollutants that contribute to acidic rain?
Explain about the Proteins? Proteins, as you may already know, are made up of carbon, hydrogen, nitrogen, oxygen and usually sulphur. Proteins are built up of a large number of
Pyramid of Biomass - Ecological Pyramids The pyramid of numbers is not a very good method to use if the organisms at different trophic levels are of greatly differing sizes. T
general chARACTERS OF PORIFERA
Q. Illustrate Temporal digital subtraction radiography? Temporal digital subtraction radiography (SR) is a radiographic technique that enable two radiographs made at different
Rheumatic fever is an immunologically mediated connective tissue disorder following throat infection with group-A streptococci (GAS). It is characterised by an inflammatory proces
Educate the Mothers Regarding Prevention of Diarrhoea While working in the diarrhoea clinic, ward or community, your major responsibility as a nurse is to educate mothers re
Causes of Cancer Scientists have identified the cellular genes that code for those proteins which jointly control and regulate cell growth and division. These genes are of two
Hirschsprungs Disease (Congenital Megacolon): This is also known as congenital megacolon. There is absence of ganglion cells, submucus plexus and intramural plexus (parasym
LIVE R - The liver produces a protein angiotensinogen which is changed to angiotensin II by an enzyme renin secreted by the juxtaglomemlar apparatus of the nephrons in the kid
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd