Week 8 part 2

Question 1

algae cycle

Answer 1

after fertilisation, the zygote (2n) is released and dispersed via water currents
zygote (2n) undergoes meiosis to form haploid cell (n)
this cell then undergoes mitosis to form multicellular haploid algae (n)
sperm(n) is released into water while egg(n) is retained
fertilisation

Question 2

algae require

Answer 2

water

Question 3

bryophytes cycle

Answer 3

fertilised zygote (2n) develops into sporophyte (2n) via mitosis (supported by gametophyte)
sporophyte (2n) produces spores (n) via meiosis
spores (n) released into air
those that land on a suitable site germinate via mitosis to form gametophyte(n)
sperm (n) release stimulated by rain in male gametophyte
egg (n) is retained in female gametophyte
fertilisation

Question 4

bryophyte dominant generation

Answer 4

gametophyte

Question 5

bryophyte examples

Answer 5

moss
liverwort
bryum
hornwort

Question 6

Vascular plants cycle

Answer 6

zygote (2n) forms sporophyte (2n) via mitosis
sporophyte initially dependent on gametophyte (n), but becomes independent due to vascular tissue
sporophyte (2n) produces spores (n) via meiosis
spores dispersed in air
those that find a suitable site will germinate via mitosis to form gametophyte (n)
sperm (n) released when moisture sensed
egg(n) retained
fertilisation

Question 7

vascular plants dominant generation

Answer 7

sporophyte

Question 8

vascular plants examples

Answer 8

Ferns

Question 9

seed plants cycle

Answer 9

2 spore (n) types form in separate sporangia
via mitosis, one forms female gametophyte (n) which is ovule, and the other forms male gametophyte (n) which is pollen
pollen transported via animal or air from sporangium to near ovule
grows through ovule tissue to reach ovule
fertilisation
ovule becomes seed (2n)

Question 10

Pine trees cycle

Answer 10

fertilised ovule develops into seed (2n)
seed (2n) dispersed and germinates
sporophytes (2n) formed via mitosis
sporophyte forms two types of gametophytes (n) via mitosis
male gametophyte (n) that develops in pollen cones become pollen (n)
female gametophyte (n) that develops in ovule cones become ovule (n)
pollen released into air and land on ovule cones
pollen tube formed to reach the ovule
fertilisation

Question 11

stamen (AS)

Answer 11

pollen

Question 12

carpel (AS)

Answer 12

ovule

Question 13

pollen (AS)

Answer 13

stamen

Question 14

ovule (AS)

Answer 14

carpel

Question 15

male GP (AS)

Answer 15

3 cells

Question 16

female GP (AS)

Answer 16

7 cells