Reproduction 2, gymnosperms cone structure and reproductive cycle

Question 1

whats a disadvantage of homospory

Answer 1

new sporophyte, while developing from the zygote, is temporarily dependent
on a tiny gametophyte for its start in life.

Question 2

advantage of having a sporophyte

Answer 2

embryo uses resources and protection

Question 3

Megagametophyte is retained inside the

Answer 3

maternal sporophyte; an ovule

Question 4

Oldest known seeds lived

Answer 4

350 million years ago

Question 5

First seed plants

Answer 5

were gymnosperms, but fernlike

Question 6

An early seed plant resembling
a fern

Answer 6

Medullosa

Question 7

In most conifers, where are seeds contained

Answer 7

seeds are in cones
and are naked–> not contained in fruit

Question 8

how many cone types do MOST conifers have

Answer 8

2
pollen cone and seed cone

Question 9

Where do seeds develop on pine seed cones

Answer 9

seeds develop on
woody scales

Question 10

-Pollen cone where are microspores produced
-what do the microspores develop into

Answer 10

microsporangia

microgametophytes

Question 11

Pines produce vast quantities of pollen in the

Answer 11

spring

Question 12

in pine seed cones, Each scale bears

Answer 12

2 ovules

Question 13

parts of ovule

Answer 13

microphyle
integuement

Question 14

Megasporangium in ovary

Answer 14

Nucellus

Question 15

urethra in ovary

Answer 15

microphyle

Question 16

outer layer of ovary
haploid or diploid?

Answer 16

integuement
diploid

Question 17

layer containing egg in ovary

Answer 17

archegonium

Question 18

Egg
haploid or diploid

Answer 18

haploid

Question 19

female gametophyte haploid or diploid

Answer 19

haploid

Question 20

the nutritious tissue is the

Answer 20

female gametophyte

Question 21

what do some conifers require to release their seeds

Answer 21

fire–> forest fires

Question 22

Conifer reproduction after fertilization
haploid or diploid

Answer 22

1. zygote develops into the embryo of a seed
2. wings develop
3. young sporophyte (seedling)
4. sporophyte–> tree
5. develops male and female cones micro and macro sporangium
6. megasporocyte and microsporocyte that are contained within cones undergo meiosis
   diploid

Question 23

Conifer reproduction after meiosis, megaspores
haploid or diploid

Answer 23

1.contained in the megasporangium, 3 megaspores degenerate.
2. one megaspore develops into female gametophyte
3. contained in archegonium
haploid

Question 24

Conifer reproduction after meiosis, microspores
haploid or diploid

Answer 24

1.microspores released(pollen)
2. generative cell divides producing 2 more cells(pollen tube and sprematogenous cell? idk)
3. spermatogenous cell divides producing 2 sperms
4.pollen tube grows towards archegonium, and unites with egg.
5.Zygote(2n) formed in archegonium
haploid

Question 25

fleshy seedy cones

Answer 25

juniper berries

Question 26

fleshy seed coat

Answer 26

aril

Question 27

red fleshy aril

Answer 27

yew

Question 28

seeds enclosed in fleshy seed coat with nauseating colour

Answer 28

Ginkgo biloba