Page 145 - Science Course 1 (Book 1)

Mo4-L6b: How do Seedless and Seed Plants Reproduce?

Key Concept • A pollen grains forms in a male reproductive
structure of a seed plant.
How do Seedless and Seed Plants
Reproduce? • Pollen grain produce sperm cells which can be
How do seedless plants such as mosses and carried to female reproductive structures by wind,
ferns reproduce? animals, gravity, or water currents.

• The female reproductive structure of a seed plant
where the haploid egg develops is called the
ovule.

Pollination occurs when pollen grains land on a
female reproductive structure of a plant that is the
same species as the pollen grains.

Following pollination, sperm enter the ovule and
How do seed plants reproduce? fertilization occurs.

Unlike seedless plants, the haploid generation A zygote forms and develops into an embryo, an
of a seed plant is within diploid tissue. immature diploid plant.

Separate diploid male and diploid female
reproductive structures produce haploid
sperm and haploid eggs that join during
fertilization.

Gametophyte
Haploid (n)
Archegonium

Sperm
Spore
Archegonium
n n An embryo, its food supply, and a protective covering
n Spores make up a seed.

Meiosis Fertilization

2n Spore mother Zygote
cell 2n
Embryo
Sporangia 2n

Diploid Sporophyte
(2n)

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