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Flashcards in Vascular Plants Deck (30)
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1

When were most seedless vascular plants established by?

Devonian

2

What are the seedless Vascular plats called?

Pteridophytes, with the classes Lycopsids, Spenopsids and Ferns

3

When did they appear?

420 mya

4

What distinguishes them from bryophytes?

Sporophyte dominant, not dependent on gametophyte, and vascular system developed.

5

What did branching allow?

More complex bodies, greater diversity

6

What happened as a result of more complexity?

increased competition for sunlight and space, may have driven evolution further

7

What are the derived traits of vascular plants?

Transport in xylem and phloem
Roots
Leaves
sporophylls and spore variation

8

What is the Xylem?

conducts water and minerals, cells are lignified

9

What are tracheids?

Tube shaped cells that carry water and mineral up from the rooys

10

What is the phloem?

cels arranged into tubes that distribute sugars, amino acids

11

What are the advantages of lignified tissues?

Allow plant to grow taller, as provides support

12

What are roots?

Lignified tissue below ground, absorb water and nutrients from the soil, anchoring plants

13

What is the advantage of having leaves?

increase the surface area of the plant

14

What is the role of the leaves?

Main photosynthetic organ of the plant,

15

What are microphylls?

Small, usually spine shaped leaves supported by a single strand of vascular tissue

16

What are megaphylls?

Leaves with highly branched vascular systems, with greater SA and productivity

17

Which plants have microphylls?

Most of the older lineages, and all lycophytes

18

What are sporophylls?

Modified leaves that bear sporangia

19

What are the sporophyte in ferns?

Known as sori, usually on the underside

20

What are strobili?

Cone like structures, the sporophytes present in many gymnosperms and lycophytes

21

What are homosporous species?

Have one type of sporangium that produces one type of spore, develops in to a bisexual gametophyte

22

What are heterosporous species?

Has two types of sporangia and produces two types of spores

23

What are microsporangia?

Female, structure where megaspores are formed

24

Where are female gametophytes produced?

In megasporangia on the megasporophylls

25

Where are the male gametophytes formed?

In the microsporangium on the microsporophylls

26

What are megaspores?

Develop into female gametophyte

27

What are microspores?

Develop into male gametophyte

28

Which species are generally heterosporous?

All seed plantsand a few seedless vascular

29

What are megasporophylls?

bear sporangia that create female spores

30

What are microsporophylls?

Bear sporangia that create male spores