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Flashcards in lecture 8 Seed plants Deck (68)
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1

What is the first step in the life cycle of lower land plants?

Multicellular vegetative haploid plant(gametophyte)

2

What is the second step in the life cycle of lower land plants for males?

Male sex organ (gametangium)

3

What is the third step in the life cycle of lower land plants for males?

antherozoids

4

What is the Fourth step in the life cycle of lower land plants ?

FUSION

5

What is the fith step in the life cycle of lower land plants?

Zygote

6

What is the Sixth step in the life cycle of lower land plants?

Multicellular vegetative diploid plant(sporophyte)

7

What is the Seventh step in the life cycle of lower land plants ?

Sporangium

8

What is the Eight step in the life cycle of lower land plants?

MEIOSIS

9

What is the Nineth step in the life cycle of lower land plants?

SPORES

10

What is the second step in the life cycle of lower land plants for females?

Female sex organ (gametangium)

11

What is the third step in the life cycle of lower land plants for females?

egg

12

What does the introduction of genetic material from another individual during sexual reproduction adds to?

Variation among offspring

13

Alternation of generations is most clearly seen in?

Bryophytes – sporophyte shows a number of pre-adaptations to successful life on land

14

In Pteridophytes the sporophyte is?

predominant in the LC

15

What is the most important reproductive & dispersal unit of Bryophyta (haploid)?

Spores

16

Describe seeds

a reproductive structure Composed of a protected embryo plant

17

How are Embryo's developed in seed plants?

develops from a fertilised oosphere of a gametophyte which is at all times structurally attached to, and physiologically dependent upon, a sporophyte

18

List the features of Gymnosperms

•Naked seeds (not protected)
•Winged seeds
•Wind pollinated
•Conifers produce cones
–Female cones are larger contain ovules
–Male cones are smaller contain pollen
•Needle like leaves
•Evergreen, leaves are continually replaced

19

List the features of Angiosperms

•Protected seeds in fruit
•Produce flowers
•Colourful to attract pollinators
•Broad shaped leaves
•Deciduous – lose all leaves once per year; remain dormant in the winter

20

What species of plants became dominate with time?

sporophyte

21

What types of gametophyte plants became dominate?

•From single gametophyte plant
–To small male gametophyte
–Large female gametophyte

22

Explain Heterospory

–Microspores producing male gametophyte

–Megaspores producing female gametophyte

23

Progressive changes in the life cycle of land plants cont: Development of gametophyte within the spores before?

dispersal

24

Progressive changes in the life cycle of land plants cont: Retention of female megaspore in the?

megasporangium

25

Progressive changes in the life cycle of land plants cont: development of the female?

gametophyte

26

Development of male gametophyte within what female organs?

–Carpel = megasporophyll

–(NB a carpel = ovary, style & stigma)

27

Seed plants (spermatophytes) – show the?

phenomenon of alternation of generations

28

What the 2 types of spores produced by sporophytes?

•Microspores

•Megaspores

29

Sporophyte produces 2 types of spores,this is known as?

heterosporous

30

Megasporangium – undergoes?

meiosis to produce megaspores (female gametophyte)