Gymnosperm

Front 1

pollen

Back 1

A fine dust that contains the sperm of seed-producing plants

Front 2

nucellus

Back 2

inner part of an ovule, in which the embryo sac develops; equivalent to a megasporangium

Front 3

micropyle

Back 3

A pore in the integuments of an ovule

Front 4

seed

Back 4

An ovule with a protective coating, encasing a mature plant embryo and a nutrient source

Front 5

seedling

Back 5

A young plant

Front 6

dioecious

Back 6

"two-housed"; male and female flowers on different plants

Front 7

megastrobilus

Back 7

in conifers, the female (seed-bearing) cone

Front 8

peduncle

Back 8

flower stalk

Front 9

cotyledon

Back 9

A "seed leaf" which develops as a part of the seed. It provides nutrients to the developing seedling and eventually becomes the first leaf of the plant.

Front 10

apical meristem

Back 10

Embryonic plant tissue in the tips of roots and in the buds of shoots that supplies cells for the plant to grow in length.

Front 11

tube cell

Back 11

the cell of a pollen grain that gives rise to the pollen tube -> micropyle

Front 12

seed-scale complex

Back 12

the numerous scales in young female cones, each has two ovules

Front 13

ovuliferous scale

Back 13

In certain conifers, the appendage or scalelike shoot to which the ovule is attached.

Front 14

pollination tube

Back 14

Represents the body of gametophyte

Front 15

ovule

Back 15

A structure that contains an egg cell.

Front 16

integuments

Back 16

layers of sporophyte tissue that envelop and protect the megasporangium in gymnosperms.

Front 17

pollen tube

Back 17

slender tubular outgrown from a pollen grain that penetrates the ovule and releases male gametes; from tube cell

Front 18

seed coat

Back 18

The outer covering of a seed

Front 19

gymnosperm

Back 19

Naked seeds

Front 20

microstrobilus

Back 20

male pollen-bearing cone

Front 21

sperm nuclei

Back 21

in each pollen tube, one pollinates 'food' other pollinates 'seed'

Front 22

cone

Back 22

woody and complex megastrobilus

Front 23

radicle

Back 23

Embryonic root

Front 24

prothallial cells

Back 24

remnants of old body of male gametophyte

Front 25

generative cell

Back 25

Divides mitotically to form 2 monoploid sperm which travel down the pollen tube to fertilize the ovule

Front 26

bract

Back 26

reduced leaf at based of cone

Front 27

pollination droplet

Back 27

In gymnosperm plants, there is a droplet of liquid on the micropyle which catches pollen and then is reabsorbed into the seed, fertilizing it.

Front 28

functional megaspore

Back 28

survival of only one of the four megaspores produced by the spore mother cell, leaving a single functional megaspore in the megasporangium