Lab 6

Question 1

What consists of phylum Lycopodiophyta?

Answer 1

Order Lycopodiales (club mosses), order Selaginellales (spike mosses), order Isoetales (quillworts)

Question 2

Key differences between the orders in phylum Lycopodiophyta

Answer 2

Order Lycopodiales: homosporous
Order Selaginellales: hetersporous, ligules
Order Isoetales: hetersporous, ligules

Question 3

Heterospory vs. Homospory

Answer 3

Heterospory means that there two distinct sizes of spores; microspore and megaspores whereas homospory refers to just having one. Megaspores lead to the production of a large female gametophyte whereas microspores lead to the production of a male gametophyte

Question 4

Describe club mosses (order lycopodiales)

Answer 4

-have xylem and phloem
-rhizomes
-microphylls
-roots
-strobili

Question 5

Function of strobili

Answer 5

Strobili are reproductive structures that contain sporangia. They function in spore production

Question 6

What is a sporophyll?

Answer 6

A modified leaf inside the strobilus that contains sporangia. It is found in horsetails, club mosses, and some ferns

Question 7

What are rhizophores?

Answer 7

A root-bearing structure that emerges at branch nodes and extend towards the soil. They are neither root nor stem