Why do some plants have flowers and others don't?

Cmon, help is for my Biology class!

FlowersBirthday FlowersSympathy FlowersFor the same reason that some people have brown eyes and others have blue. Its the type of plant they are.
Reply:Just as in animals there are stages in the process of evolution that has culminated in the evolution of man.


In the plants also there are similar stages in the process of evolution and the process has culminated in the formation of flowering plants.The major stages are as follows:-


1)The Thallophytes- The plant body has no roots stems and leaves. Reproduction by different means;but never by means of flowers. Examples are all Algae and all fungi.


2) The Bryophytes - The plant body may show root like , stem like and leaf like organs but not always and these are not true roots,stem, and leaves.No flowers are produced.Examlpes are Mosses , Liverworts and their relatives.


3) The Peridophytes - For the first time the true roots, stem and the leaves appear in this group as they are the pioneer land plants.Sill no flowers are produced.Ex.- Ferns, Lycopods and the Horse tails.


4) The Spermatophytes - The roots , stem and the leaves are well established in this group.These are the true FLOWERING %26amp; SEED BEARING PLANTS ( Spermos = seed, don%26#039;t confuse with sperm which is the male gamete.)They have two major sub groups viz. Gymnosperms and Angiosperms


A) Gymnosperms- ( Gymnos = naked; Spermos = seed.).


i)They do produce flowers; but they are not at all atractive and for a lay man they do not appear like flowers.


ii) They do produce seeds but they are not enclosed in side a fruit as there is no frut formation ( Due to absence of an ovary).So Gymnosperms = Naked seeds. Examples = The Conifers like Pinus and the members of red wood forests; The X%26#039;Mas Tree. Cycas of the deserts and many more.


B) Angiosperms - This is the most highly evolved group.In these flowering plants the seeds are ALWAYS enclosed inside a fruit (Angion = A vessel or a container; Spermos = Seed.).The fruit and seed formation is on a regular basis, as an ovary is always present. Most of the time flowers are attractive to man as well as insects and birds! No examples are needed.
Reply:Although not all plants flower, all plants do reproduce.





Just think about that.
Reply:well That how they are created. Perhaps different genes?
Reply:because the outer shell is either dry and hard or soft and moist
Reply:flowering plants are self producing seed others are permanent and do not have to seed to regrow they just keep growing
Reply:Plants that flower usually require the intervention of insects for pollenation, the brightly coloured flower draws the insects, bees to it.
Reply:Millions of years of evolution. Plants that flower do so to attract birds and insects. The pollen on these flowers are transported to other like flowers and this allows for a continuation of that plant species.





Other plants may have seeds and don%26#039;t need flowers. The seeds can be found in fruit or vegetable, are eaten by animals, and then when animals %26quot;do a #2%26quot; the seed is deposited back on the ground. Life continues....





Unfortunately, you probably need a real answer, you should just look in your biology book, or check online...better answers a available.
Reply:The flowering plants or angiosperms evolved ~132 million years ago (relatively recently) and before that plants did not have flowers in the conventional sense (e.g. Conifers and Gymnosperms).make up