Topic 15

Question 1

Origin of Vascular Plants

Answer 1

Earliest vascular plant fossils about 425 mya

Question 2

Shared Derived Traits of Vascular Plants

Answer 2

1. Vascular tissue
2. Life cycles with dominant sporophytes that are not continuously reliant on gametophytes
3. Well developed roots/leaves

Question 4

Two Types of Vascular Plant Leaves

Answer 4

Microphylls evolved as outgrowths of stems.

Megaphylls evolved from webbing between flattened branches

Question 5

Sporophylls

Answer 5

modified leaves bearing sporangia

Question 6

Sori

Answer 6

Clusters of sporangia found on the underside of sporophylls on ferns

Question 7

Strobili

Answer 7

cone like structures formed from a group of sporophylls aka cones

Question 8

Homosporous v. heterosporous plants

Answer 8

Homosporous plants are seedless vascular plants with sporophytes producing a single type of spore that develop from a bisexual gametophyte

Heterosporous plants are all seeds plants producing megaspores and microspores

Question 9

Characteristics of Seedless Vascular Plants

Answer 9

1. Vascular tissue enable heigh
2. Have flagellated sperm that require a film of water for fertilization
3. Sporophyte is dominant

Question 10

2 Clades of Seedless Vascular Plants

Answer 10

1. Lycophyta: club mosses, spike mosses, and quillworts that are microphyllous
2. Monilophyta: ferns, horsetails, whisk ferns, and relatives that have megaphylls