sex

Question 1

Chlamydomonas reinhardtii

Answer 1

unicellular green alga
lives in damp places
is haploid but when stressed does sexual reproduction mt+ and mt- to form zygospores which are diploid and inactive so can survive stress
when stress is over divide by meiosis

Question 2

ulva lactuca sea lettuce

Answer 2

have a gametophyte and sporophyte
if has sex forms a zygote which then divides by mitosis
forms zoopsores

Question 3

red alga nori

Answer 3

gametophyte is platelike
sporophyte is elongated and stringy
shows alteration of generations
male and female strctures and water moves sperm

Question 4

three groups of bryophytes

Answer 4

liverworts mosses hornworts

Question 5

liverworts

Answer 5

dominant gametophyte tat was either thalloid or leafy
rhizoid cells grow down into soil
male and female strctures
sperm from gametophore swims to female, a sporophyte grows on the gametophore

Question 6

moss

Answer 6

spiral strcuctres in leaf like arrangement
ombrotrophic
sperm and egg meet at ground level, sporophyte grows well above the gametophyte sporophyte sucks water up, isn’t very photosynthetic so also takes sugars from gametophyte

Question 7

moss sporophytes

Answer 7

water proof cuticle
vascular tissue and stomata
controlled desiccation
tall sporophytes= better spore dispersal

Question 8

hornworts

Answer 8

have cyanobacteria in clefts
symbiosis with nitrogen fixer
both the gsmetophyte and sporophyte do photosynthesis

Question 9

problems of bryophytes

Answer 9

limited to damp places
no root system
can survive desiccation
limited nutrients, ombrotrophic

Question 10

lichens

Answer 10

symbiosis between an alga/cyanobacteria and a fungus