Lab test 5

Question 1

In what environment would you expect to find mosses?

Answer 1

Moist/damp conditions or dense forest floors

Question 2

What advantages are there to moss plants growing in dense clumps?

Answer 2

Reduce transpiration

Assist reproduction

Question 3

Given that antheridia and archegonia occur separately, how will sperm reach the egg?

Answer 3

Via a film of water

Question 4

Which is the dominant phase of the moss life cycle?

Answer 4

Gametophyte stage

Question 5

What features lead you to the dominant phase of the moss?

Answer 5

Leafy gametophyte is photosynthetic

Sporophyte grows out of gametophyte

Question 6

Which is the dominant phase of the fern life cycle?

Answer 6

Sporophyte stage

Question 7

What features lead you to the dominant phase of the fern?

Answer 7

Gametophyte is small and short lived

Sporophyte is large, photosynthetic and persistent

Question 8

What is the significance of the ‘green’ colouration of the megagametophyte in Ginkgo?

Answer 8

Contains chlorphyll

Enough light reaches the gametophyte to permit some photosynthesis

Question 9

What features do Mosses and ferns contain?

Answer 9

Free-living, photosynthetic gametophyte
Relatively large male and female gametophyte
No female gametophyte enclosed in sporophyte tissue
Relatively large multicellular gametangia

Question 10

What features do gymnosperms contain?

Answer 10

No Free-living, photosynthetic gametophyte
Small female and male gametophyte
Contain female gametophyte enclosed in sporophyte tissue
Small large multicellular gametangia