The remains of male gametophyte disintegrate after fertilization. Only a few of the ovules develop into mature seeds (Fig. These male and female sex cells, also known as eggs and sperm, unite during fertilization to form a diploid zygote. (b) Female gametophyte: The megaspore is the first cell of the female gametophyte. The sperm cells which are foreseen of flagella can reach the female gametophyte by means of a drop of (rain)water. It is in the haploid gametophyte structure that gametes are formed. Largely independent. The male cone produces tiny amounts of pollen grains that become the male gametophyte. within the megaspore. In all angiosperms, development of female gametophyte is endosporous, i.e. The male gametophyte lands on the female cone, forming a pollen tube through which the generative cell travels to meet the female gametophyte. Male and female gametophytes of angiosperms. What are the main components of a mature gymnosperm seed? 1. The generative cell ultimately divides to yield two sperm cells well after pollination takes place. Gametophytes (male and female gametes) are developed by the heterosporous (two types) bryophytes, where one kind of spore develops a male gametophyte, while the other develops a female gametophyte. The embryo is: a. diploid b. haploid Each pollen grain is reduced to two or three cells in a waxy protective coat. b. the male gametophyte c. the female gametophyte d. the sporophyte. One of the two sperm cells released by the generative cell fuses with the egg, forming a diploid zygote that divides to form the embryo. Female gamete is attached to the parent plant. 13.15B). It … Between these two alternations of generation, the haploid gametophyte phase lasts longer or dominates the diploid saprophytic phase. All the cells of the male gametophyte are functional. The male gametophyte is only 3-ceiled. Identify AND Define: (female gametophyte tissue, archegonium with an egg inside the venter) b. Moss antheridium. (A) Male gametophyte. In each antheridium numerous male gametes (antherozoids = sperms) are produced, but in each archegonium only one large single egg cell is produced (ovum). Pollen grains consist of two or three cells at the time they are released from the plant. The lowermost megaspore enlarges and produces an embryo sac. Identify AND Define: (male gametophyte tissue, antheridia with sperms inside; paraphyses (sterile filaments) c. Moss mature capsule Identify AND Define: (capsule, spores, operculum (cap), seta) d. FERNS. Female Cone: The female cones resemble with the male cones except in some definite aspects. The difference between the female gametophyte of pteridophytes and gymnosperms are:Female gametophyte of Pteridophyte Female gametophyte of Gymnosperm Distinct female gamete may not be present Distinct female gamete is always present. The term gametophyte may refer to the gametophyte phase of the plant life cycle or to the particular plant body or organ that produces gametes. In typical case, the functional lowermost megaspore gives rise to 8-nuclcate embryo sac. a. embyro b. seed coat c. megasporangium d. pollen grain e. ovule f. megaspore g. food supply. In the young condition, there is hardly any external difference between female and male cones. Female Gametophyte: 1. This figure shows a two-celled pollen grain consisting of a tube cell and a generative cell. 13.15). These grains have winglike structures that allow the wind to carry them up the tree to the female cones. 6. 7. b. the male gametophyte. Not enclosed in an ovule. 8. A single ring of 4-10 female flowers or ovules is present just above each collar (Fig. a. embryo b. seed coat g. food supply. The tube cell is required to carry the two male gametes, both of which take part in fertilization.
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