Laboratory Manual to accompany Essentials of Biology, Fifth Edition Fern spores

Question

Laboratory Manual to accompany Essentials of Biology, Fifth Edition Fern spores are produced by meiosis in sporangia, which in many species occur on the underside of large leaves called fronds. These leaves are called megaphylls because they are broad leaves with several strands of vascular tissue. The spores are released when special cells of the annulus (a line or ring of thickened cells on the outside of the sporangium) dry out, and the sporangium opens. How do ferns move to new locations? Observe the ferns on display, and then complete Table 14.1. Table 14.1 Fern Diversity Type of Fern Description of Frond Observation: Fern Sporophyte Study the life cycle of the fern (Fig. 14.12), and find the sporophyte generation. This large, complexly divided leaf is known as a frond. Fronds arise from an underground stem called a rhizome. Living or Preserved Frond Examine a living or preserved specimen of a frond, and on the underside, notice a brownish clump called sorus (pl., sori), each a cluster of many sporangia (Fig. 14.13) What is being produced in the sporangia? Given that this is the generation we call the fern, what generation is dominant in ferns? Figure 14.13 Underside of frond leaflets Sori occur on the underside of frond leaflets. cswEducoCanynro phtgraghr sorus Laboratory 14 Nonvascuiar Piants and Seedless Vascular Plants17 4-11

Explanation / Answer

.Fern spores move from here and there with the help of wind .

.fern spores are being produced in sporangia .

Sporophyte generation are being dominant in the life cycle of fern.

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