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