Download 5 Reproduction in Plants

Reproduction in Plants
We looked at how seeds germinate, but not all plants reproduce
the same.
Spores
Simple reproduction is found in lower forms of plant life.
Simple plants, like mold, reproduce by spores. Each spore is a tiny cell
with a tough cell wall. The plants produce millions of spores which are
released into the air by the parent plant. Those spores may stay alive
for years without developing. When the spore lands where the
conditions are right, it will start to grow.
Cuttings
Some higher
plants can reproduce
from a cutting. A
cutting is part of a
plant that has been
removed. Shoots with
leaves attached are
usually used. New roots and leaves will grow from the cutting. The
shoot is cut at an angle. A growth promoter may be used to help with
the growth of the roots. A cutting will grow into a new plant.
Materials: Swedish Ivy, plastic cup, scissors, naturalist’s notebook,
pencil
What to do:
1. Label the cup with your table name and period.
2. Use your scissors to cut off the last 3 inches of one of the stems.
3. Fill the cup half full of water and put the end of the stem in the
water.
4. Draw a sketch in your journal.
5. Check the water supply each class and sketch a picture each time
you notice a change. Include the date for each picture.
Runners
Plants, like
strawberries, can
reproduce by runners.
Runners are special stems
that grow along the top of
the ground. The end of
the stem forms a root
system which will
eventually develop into
another strawberry plant.
When the new plant is
matured, the runner dies.
Buds
Potato plants have stems that grow underground. These stems
store food. As the food collects, the stems begin to swell. The swollen
parts are the potato. The potato then forms buds that will grow into
new plants.
Rhizomes
The grass in your lawn
reproduces by rhizomes. Rhizomes
are underground stems that grow
directly into new plants. They can
often spread quickly.
Though flowers all have the same parts, they may look
different. When a flower matures, the pollen grains loosen from the
stamen. Some grains are blown away by the wind. Some become
attached to birds and insects. When pollen grains land on another
flower of the same kind they attach to the sticky part of the pistil.
Reproduction is about to begin. The pollen grain sprouts a long tube
which grows down the pistil into the ovary. A special sperm cell will
move down the tube into the ovary. It attaches to one of the ovules.
This process is called fertilization.
Bulbs
Watch the video on pollination and answer the following questions.
Tulips and onions can
reproduce from bulbs. A bulb
contains an underground stem.
Leaves are attached to the
stem. These leaves contain
much stored food. Bulbs are
really part of the stem. The
bulb produces new bulbs at its base. Each new bulb grows into a
separate plant. Bulbs grow as the plant produces excess food.
1. Pollen from the ______________ of one flower must be carried to
the _________________ of another flower.
2. What helps pollinate plants?
a. _______________ b. _______________ c. _______________
d. _______________ e. _______________ f. _______________
3. What adaptations have flowers made to attract insects to them?
Seed Plants
______________________________________________________
As we saw before, most plants reproduce from seeds. Even
many of the plants that have runners, buds, rhizomes, and bulbs
reproduce by seeds. The seeds are made in the flowers of each plant.
4. What is the relationship called that plants have with the insects that
pollinate them? _____________________________
Most flowers have both male and female reproductive organs.
The male organ is the stamen and it produces a powdery substance
which is the sperm called pollen.
The female organ is the pistil. At
the base of the pistil is a small
opening called the ovary, and
inside the ovary are the ovules, or
eggs.
Materials: flower, naturalist’s notebook, pencil, hand lens
What to do:
1. Go outside and find a flower.
2. Sit down and carefully observe the flower with your hand lens.
3. Sketch a picture of the plant and the flower and label all the parts of
the plant and the flower. Describe the parts of the flower only.
Name: _______________________Period: ____Date: ____________
EXIT TICKET – Reproduction in Plants
Name: _______________________Period: ____Date: ____________
EXIT TICKET – Reproduction in Plants
1. What does pollen have in common with human sperm cells?
1. What does pollen have in common with human sperm cells?
A. they are both male sex cells
B. they are both female sex cells
A. they are both male sex cells
B. they are both female sex cells
C. they are both carried by insects
D. they are both types of seeds.
C. they are both carried by insects
D. they are both types of seeds.
2. What is another name for a fertilized ovule/
2. What is another name for a fertilized ovule/
A. A pistol
B. A stamen
A. A pistol
B. A stamen
C. An anther
D. A seed
C. An anther
D. A seed
3. How does the pollination of most trees and grasses differ from the
pollination of flowers?
3. How does the pollination of most trees and grasses differ from the
pollination of flowers?
A. Trees and grasses self-pollinate; flowers must get pollen from
other flowers.
A. Trees and grasses self-pollinate; flowers must get pollen from
other flowers.
B. Trees and grasses pollinate in the springtime; flowers pollinate in
the fall.
B. Trees and grasses pollinate in the springtime; flowers pollinate in
the fall.
C. Trees and grasses are often pollinated by the wind; flowers are
often pollinated by insects
C. Trees and grasses are often pollinated by the wind; flowers are
often pollinated by insects
D. Trees and grasses have large, heavy grains of pollen; flowers
have small, fine grains of pollen
D. Trees and grasses have large, heavy grains of pollen; flowers
have small, fine grains of pollen
4. Honeybees and flowers are linked in a mutually beneficial
relationship. What is a mutually beneficial relationship?
4. Honeybees and flowers are linked in a mutually beneficial
relationship. What is a mutually beneficial relationship?
A. a relationship in which one participant benefits but the other does
not
A. a relationship in which one participant benefits but the other does
not
B. a relationship where neither participant benefits
B. a relationship where neither participant benefits
C. a relationship in which one participant benefits but the other is
harmed
C. a relationship in which one participant benefits but the other is
harmed
D. a relationship in which both participants benefit
D. a relationship in which both participants benefit