21.4 2) ________________________________________________________________________
ID: 258385 • Letter: 2
Question
21.4
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21.4 Phylum Bryophyta: Mosses (About 60 min.) Mosses are plants that you've probably noticed before. They grow on trees, rocks, and soil. Mosses have a wide variety of human uses, the most common ones being as a soil additive to potting soil and as a major component of peat, which is used for fuel in some parts of the world MATERIALS Per student compound microscope dissecting microscope dissecting needle Polytrichum, male and female gametophytes, the latter with attached sporophytes prepared slide of moss antheridial head, 1.s prepared slide of moss archegonial head, l.s prepared slide of moss sporangium (capsule), s glass microscope slide coverslip Per student pair dH2O in dropping bottle Per student group (table) moss protenemata growing on culture medium PROCEDURE Refer to Figure 21-15 as you study the life cycle of the mosses 1. Obtain a living or preserved specimen of a moss that grows in your area. The hairy-cap moss, Polytrichum, is a good choice because one of the 10 species in this genus is certain to be found near wherever you live in North America 284 EXERCISE 21 Copyright 2013Lel Rghts Reserved May mot be coried, scanned or duplicated, in whoke or in part. Due to electronic righis, some thnd party conten may be suppressed from the ellook andfor eChapwris) Copyrighted material Editorial Fevie has deemed that ar suppressed cet ent des not materially a ect the overall learning experience. C en?age earning reserves thK right to remove a tional coEbit it any time if subsequent ts restrictions require it.Explanation / Answer
2. Bryophyte, especially mosses uses rhizoids to absorb nutrients and water.
3. In mosses the mature gametophyte develops into leafy shoots that produce sex organs (gametangia) which produce gametes.
10. Immature capsule in the young sporophyte is green.
In the early stage of growth, sporophyte can produce some of its own food by photosynthesis.
15. Meiosis takes place for the sporogenous tissue to become spores.
Protonema is the part of gametophyte generation. It is the first part of the moss that develops from the germinating spore.
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