how development of flower are help in classification of plant
Answers
Answer:
Magnoliophyta
Explanation:
The characteristic features of the phylum (division) of Magnoliophyta are: (1) ovules are enclosed in a more or less completely closed cavity formed by one or by several to many separate or united carpels; (2) pollen grains are deposited not directly on the micropyle of the ovule but on the stigmatic surface, which is capable not only of receiving the pollen but also of assisting in the development of the pollen tube (initially the stig-matic surface stretches along more or less free carpel-lary margins, but in the majority of flowering plants it is localized and forms a specialized stigma); (3) both male and female gametophytes are devoid of gametan-gia (antheridia and archegonia) and are extremely sim-plified and specialized; (4) triple fusion: one of the two male gametes fuses with the egg cell (syngamy), and the other with two free or already fused polar nuclei of the central cell of the female gametophyte; as a result of triple fusion a diploid zygote and a triploid primary nucleus of the endosperm are formed; although in the Podostemaceae and Orchidaceae the endosperm fails to develop or degenerates early in ontogeny, the triple fusion is a characteristic feature of magnoliophytes, sharply distinguishing them from all other plants; (5) sieve elements with companion cells.
The flowering plants, also known as the angiosperms, constitute the largest and most conspicuous group of modern plants. They predominate in number of species and number individuals, and constitute the dominant vegetation of the Earth's surface today. Flowering plants inhabit the most diversified environments and may be found wherever higher plants can survive. They have evolved a remarkable variety of life forms, a much greater variety than is to be found in the other phyla of the plant kingdom. They range in life span from a few weeks to several thousand years