Download Reproduction

Homework
Plant characteristics and types quiz on Tues.
• Study pages 96 and 109 in journal
Learning Targets
I can…
• Determine the sequence of steps for
reproduction in flowering plants
Homework Check
Check your answers, then glue in your ISN
1.
2.
3.
4.
5.
6.
Sunlight
Glucose
Chlorophyll
Carbon Dioxide
Chloroplast
Water
7. Oxygen
8. Carbohydrates
9. Cellulose
10.Leaves
11. Photosynthesis
I Have, Who Has…
Flower Dissection
Flowers
FUNCTION:
• Adaptation for sexual
reproduction
IMPORTANCE:
• Helps plants reproduce
• Humans use in products
(spices, perfumes, lotions)
• Food source
(broccoli, cauliflower, artichokes)
Pollen grain
forms on
anther Pollen tube
forms
Sperm fertilized the ovule (egg)
to produce a new seed.
dead petals and sepals
ovary
fertilized
ovule (seed)
Angiosperm Sexual Reproduction Journal
•
List the SIX steps of angiosperm sexual reproduction using
the provided diagrams.
Vocab Definitions:
Pollen (86)
Pollination (89)
Directions:
Unscramble the six steps of
flower reproduction
Unscramble the steps:
 Under favorable conditions, the seed germinates
(sprouts).
 A pollen tube grows to the ovule
 The ovary around the ovule becomes a fruit (protects
& helps spread the seed)
 Fertilization: sperm & egg fuse in the ovule
 Pollination: pollen moves from anther (male) to
stigma (female)
 Ovule develops into a seed
• Pollination: pollen moves from the anther (male) to
the stigma (female)
• A pollen tube grows to the ovule
• Fertilization: sperm & egg fuse in the ovule
• Ovule develops into a seed
• The ovary around the ovule becomes a fruit (protects
& helps spread the seed)
• Under favorable conditions, the seed germinates
(sprouts).
Geranium:
The size of the grains is
measured in millionths
of a meter, but the
romantic journeys of
pollen are epic. The
dozens of golden grains
that have successfully
reached a Geranium
phaeum flower's stigma
must compete to be
among the few that
achieve fertilization.
Snowball blossom
Lodged in the rumpled tissue of a Viburnum tinus stigma, pollen grains from other
snowball blossoms (gray) swell with moisture. One (at center) is already growing the
tube that delivers sperm to the ovule. Other species' pollen (yellow and green) has
landed amiss; genetic defenses exclude them from the fertilization race.
Willow
A grain of Salix caprea pollen has
missed its mark. Wedged between
flower petals, it will die. While
some grains will be flung into the
air as springtime breezes swirl the
willow leaves, others will stick to
the backs of bees and find their
way.
Pollen comes in many forms
and sizes. The diameter of a
pumpkin pollen grain (at
center) is as thick as a dollar
bill. The tiny speck at its lower
right is a grain of forget-me-not
pollen.
Flowering quince:
The convoluted surface of Chaenomeles sp. pollen may speed up moisture absorption
when the grain lands on a target bloom. "Quick hydration means faster formation of
the pollen tube," says Swiss photographer Martin Oeggerli, a postdoctoral fellow at
University Hospital Basel. "That's important for fertilization."
White clover (Trifolium repens)
White clover's protein-rich pollen is an important food for bees, as is its nectar.
Indian mallow (Abutilon pictum)
Spines on Indian mallow pollen help it cling to bird
feathers.
Bromeliad (Tillandsia maxima)
The fold in a bromeliad grain allows it to shrink as it
dries, or swell with moisture, without breaking.
Water cabbage (Pistia
stratiotes)
The ridges on water cabbage
grains are an unusual pollen
surface feature, though the plant
is common from Egypt to
Argentina.
Forget-me-not
(Myosotis sylvatica)
Forget-me-not grains are
among the tiniest known, each
just five one-thousandths of a
millimeter across.
Venus flytrap (Dionaea muscipula)
These pollen grains are more than 15 times bigger than forget-me-not
ones: There's no consistent correlation between plant and pollen size.
Persian silk tree (Albizia julibrissin)
Persian silk tree grains are also more than
15 times bigger than forget-me-not ones.
Silver leaf tree (Proteaceae)
Silver leaf tree grains have a sticky coating that bonds them to animal carriers.
Poison bulb
(Crinum japonicum)
Poison-bulb pollen is
surrounded by long,
showy petals that attract
insect porters. Some
variations seem easy to
explain. Others remain
puzzling, or have yet to
be investigated at all.
Pine:
The pollen of this family coats cars in yellow-green dust – though this particular grain
landed on an unhatched insect egg. It floats through the air, sperm carried by two pale
"balloons." Such wind-borne pollen causes misery for allergy sufferers in much of the
world, where it falls heavily, as it has for millions of years.