The entire gametophyte generation, with the sole exception of pollen grains (microgametophytes), is contained within the sporophyte. For common flowering plants (Angiosperms), the sporophyte generation comprises almost their whole life cycle (i.e. Male gametes are sperm. Matyášek, Roman, Alice Krumpolcová, Jana Lunerová, Eva Mikulášková, Josep A. Rosselló, and Aleš Kovařík. Read on to explore more differences between the two. A gametophyte represents the sexual phase of the plant life. phase. 4th Edition, by Sinauer Associates (www.sinauer.com)
Only one ovule will
It is an independent plant with diploid chromosome number.2. Diploid multicellular stage in the life cycle of a plant or alga, Learn how and when to remove this template message, International Code of Nomenclature for algae, fungi, and plants, International Code of Nomenclature for Cultivated Plants, International Association for Plant Taxonomy, https://en.wikipedia.org/w/index.php?title=Sporophyte&oldid=1011347457, Articles lacking in-text citations from January 2009, Creative Commons Attribution-ShareAlike License. In the seed plants, the largest groups of which are the gymnosperms and flowering plants (angiosperms), the sporophyte phase is more prominent than the gametophyte, and is the familiar green plant with its roots, stem, leaves and cones or flowers. A. This alternation of generation is highly significant in plants, as it … style,
Mature 2-cell stage of a pollen grain. Hence, it is also haploid. The seed plant gametophyte life cycle is even more reduced than in basal taxa (ferns and lycophytes). "abominable mystery". sporophylls (leaves with sporangia on their upper surface). - Sporophyte does not remain attached to the gametophyte. The resulting meiospores develop into a gametophyte. Gametophyte (n) The other alternating phase in the life cycle of the plant is the gametophyte generation, in which gametes are formed. 1 lifecycle
C. The gametophyte generation is what we see when looking at a large plant. Image from Purves et al., Life:
It develops from the zygote produced when a haploid egg cell is fertilized by a haploid sperm and each sporophyte cell therefore has a double set of chromosomes, one set from each parent. Inside
followed immediately by gametogenesis. The gametophyte is considered as the sexual phase and the sporophyte is the asexual phase. The resulting zygote developed into the next sporophyte generation while still retained within the pre-ovule, the single large female meiospore or megaspore contained in the modified sporangium or nucellus of the parent sporophyte. which is composed of a complex polysaccharide, sporopollenin. a. ferns b. flowering plants c. gymnosperms d. mosses; Reason Explained It develops from the zygote produced when a haploid egg cell is fertilized by a haploid sperm and each sporophyte cell therefore has a double set of chromosomes, one set from each parent. It arises from a haploid spore produced by meiosis from a diploid sporophyte. During the Devonian period several plant groups independently evolved heterospory and subsequently the habit of endospory, in which the gametophytes develop in miniaturized form inside the spore wall. In many lower plants, the gametophyte phase is the dominant plant form; for example, the familiar mosses are the gametophyte form of the plants. In vascular plants, the sporophyte generation is dominant. Gymnosperms, like all vascular plants, have a sporophyte-dominant life cycle, which means they spend most of their life cycle with diploid cells, while the gametophyte (gamete-bearing phase) is relatively short-lived. The sporophyte is the diploid stage produced by the fertilization of a haploid egg and haploid sperm. and WH Freeman (www.whfreeman.com),
Stamens are thought to represent modified
B. pistil/carpel. Conversely, after meiosis, plant spores undergo a period of growth to produce a multicellular gametophyte, which may be independent of (e.g., ferns) or dependent on (e.g., flowering plants) the diploid mother sporophyte. and petals. Click
Because this embryo-nurturing feature of the life cycle is common to all land plants they are known collectively as the embryophytes. The above image is reduced from gopher://wiscinfo.wisc.edu:2070/I9/.image/.bot/.130/Angiosperm/Angiosperm_life_cycle.
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