Gymnosperms (Plants)

Question 1

Gymnosperms

Answer 1

‘naked seed’
seeds, no flowers
ex. conifers
seeds found in bracts of cones

Question 2

conifers

Answer 2

evergreens and soft woods

leaves are usually needle shaped and stay on tree for years

Question 3

size

Answer 3

large range- shrubs to sequoias

Question 4

life cycle

Answer 4

cones- reproductive organs

Question 5

male cones

Answer 5

contain microsporangia which produce hundreds of microspores

microspores undergo meiosis and develop into pollen grains

Question 6

pollen grains

Answer 6

protected by thick wall
released from microsporangia into air
wing-like projections aid its flight
multicellular
contains generative cell

Question 7

generative cell

Answer 7

produces 2 sperm cells and a tube cell

tube cell produces pollen tube

Question 8

female cones

Answer 8

magasporo phylls
recognizable
each branch has 2 ovules

Question 9

ovules

Answer 9

connected to surface of cone which means they are exposed

Question 10

microphyle

Answer 10

gap in ovule

receives pollen grain and pass through micropyle

Question 11

archegonia

Answer 11

develops in ovules and contain large eggs

Question 12

fertilization

Answer 12

micropyle secretes fluid when receptive- -pollination droplet
pollen landing on pollination droplet drawn into micropyle as liquid dries
micropyle closes after fertilization in pollen chamber
pollen grain develops in pollen tube which transports sperm to egg

Question 13

H2O requirements for reproduction

Answer 13

not reliant on H2O

Question 14

survival of fertilized eggs

Answer 14

multiple eggs are fertilized in one cone but only one can survive
fertilized eggs compete for nutrients