3. A) Identify the specific structure indicated by the arrow. B) Name the Phylum

Question

3. A) Identify the specific structure indicated by the arrow. B) Name the Phylum to which the whole structure belongs. C) What kind of cells are produced inside this structure? D) How are the cells produced inside this structure transferred or dispersed? A) Identify the specifie generation indicated by the arrow. B) Is the specific generation indicated by the arrow the dominant one in the life cycle of this organism? C) What kind of reproductive structures are produced by the specific generation indicated by the arrow? D) Why is the growth (in height) of mosses severely restricted? Give one reason.

Explanation / Answer

A. Structure is pseudoelater.

B. Marchantiophyta, bryophyta

C. Like mosses and hornworts, they have a gametophyte -dominant life cycle, in which cells of the plant carry only a single set of genetic information.

D. Spores are dispersed by wind.

Second part's answers are as following.

A. These are life like structures of gametophyte of mosses.

B. The gametophyte comprises the main plant (the green moss or liverwort), while the diploid sporophyte is much smaller and is attached to the gametophyte. The haploid stage, in which a multicellular haploid gametophyte develops from a spore and produces haploid gametes, is the dominant stage in the bryophyte life cycle.

C. Gametophytes.

D. The bundles are stiff, which also helps plants grow tall . The lack of bundles to transport water and nutrients limits the height of bryophytes, generally keeping the largest under 8 inches.

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