The alteration of generations comes from the fact that the sporophyte generation and gametophyte generation occur alternately. True False The gametophytes of mosses are much smaller than their sporophytes. True False Gametophytes develop into gametes and sporophytes develop into spores.
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The alteration of generations comes from the fact that the sporophyte generation and gametophyte generation occur alternately.
True | |
False |
The gametophytes of mosses are much smaller than their sporophytes.
True | |
False |
Gametophytes develop into gametes and sporophytes develop into spores.
True | |
False |
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- Figure 25.24 Which of the following statements about the fern life cycle is false? Sporangia produce haploid spores. The sporophyte grows from a gametophyte The sporophyte is diploid and the gametophyte is haploid. Sporangia form on the underside of the gametophyte.Figure 23.28 Which of the following statements about the Laminaria life cycle is false? In zoospores form in the sporangia. The sporophyte is the 2n plant. The gametophyte is diploid. Both the gametophyte and sporophyte stages are multicellular.The gametophyte of Pteridophytes is inconspicuous in comparison to the mosses. They are also commonly monecious (single "house", or thallus for male and female gamete production). The photo below shows a whole mount (w.m.) of a fern gametophyte at 40x. Make a sketch of the specimen and label the following structures: archegonium, antheridium, mature gametophyte (a.k.a. prothallus), rhizoids 90
- The gametophyte of Pteridophytes is inconspicuous in comparison to the mosses. They are also commonly monecious (single house for male and female gamete production). The photo below shows a whole mount (w.m.) of a fern gametophyte at 4x. Make a sketch of the specimen and label the following structures: archegonium, antheridium, mature gametophyte (prothallus), rhizoids AMooD ok DrThe gametophyte of Pteridophytes is inconspicuous in comparison to the mosses. They are also commonly monecious (single house for male and female gamete production). The photo below shows a whole mount (w.m.) of a fern gametophyte at 4x. Make a sketch of the specimen and label the following structures: archegonium, antheridium, mature gametophyte (prothallus), rhizoids MacBByrophytes are usually found in areas that are very wet or damp at least part of the year. Which of the following statements describes characteristics of byrophytes that make them dependent on water? State all that numbers that apply. 1. They have a dominant gametophyte phase. 2. They have swimming sperm that need water so they can swim to fertilize the eggs of other nearby plants. 3. They do not have lignin-stiffened vascular tissue or roots to effectively distribute water throughout the plant.
- The gametophyte of Pteridophytes is inconspicuous in comparison to the mosses. They are also commonly monecious (single house for male and female gamete production). The photo below shows a whole mount (w.m.) of a fern gametophyte at 4x. Make a sketch of the specimen and label the following structures: archegonium, antheridium, mature gametophyte (prothallus), rhizoidsFill in the blanks: is the apical archegonial tissue that protects the maturing sporophyte.The Riccia is a bryophyte because: It has multicellular sex organs with a sterile jacket and lacks vascular tissues Its sporophyte lacks differentiation and has a single- layered jacket It occurs mostly on land and has more motile sperm It has a heteromorphic alternation of generation and lacks leaves Next
- The male gametophyte of the moss looks identical to the female from the naked eye, but the photo below (I.s. at 4x and then at 40 x) shows that the tip contains the structures where male gametes are produced.The picture below is of a moss growing on my roof. It shows both the gametophyte and the sporophyte phases of the life cycle. Make a sketch and label which part of the moss is the gametophyte and which is the sporophyte. (Alternatively, you can find a live moss with both phases and take a picture, label it and upload here.) Label the seta, capsule and calyptra of the sporophyte.Draw a single moss plant, similar to the one shown. Be certain to show the gametophyte and the sporophyte. Now draw one without the sporophyte, showing only the gametophyte. The sporophytes usually have only a very brief life, and after they shed their spores, the gametophytes let them die.