Transcript A Process to Use Food

• A Process to Use Food
 Cellular Respiration is a gas exchange process by
which plants release carbon dioxide and let oxygen
into their cells. Water enters and leaves the cells in
the leaves through the guard cells. When they
absorb water they swell, opening the stoma (which
lets in carbon dioxide and lets out water vapor).
The word equation for cellular respiration is:
Sugar + Oxygen Carbon Dioxide + Water + Energy
1.3 Reproduction of Seed Plants
 A life cycle is the stages that a living
thing goes through from one generation
to the next. Plants reproduce in their
lifecycle in two very different ways.
Sexual reproduction involves the
production of seeds and fruits from
specialized cells of two plants.
The Seed Stage
 Seed Parts include the
living plant (embryo) , the
food supply (cotyledon),
and the seed coat.
 The length of time a seed
is able to stay alive varies
according to the conditions
it experiences. The
longest-lasting seed was
frozen for over 10,000
years before it sprouted
and even flowered.
The Seedling Stage
 Very fast growth,
producing their own
food by
photosynthesis
The Adult Stage
 Plants are adults when they produce
reproductive structures
 Example: flower, cone
Reproduction of Seed
Plants
 Pollination – process where male and female
parts of a plant join to produce a seed
 Pollen – male part of the flower (small, sticky cells)
 Ovary – female part of the flower which contains the
ovule (part that grows into a seed)
 Pollinators – organisms that carry pollen from one
flower to the next (ex: birds, insects, bats etc)
Reproduction without
seeds
 Vegetative reproduction – reproduction of
plants that does not involve seeds. Some
plants reproduce from stems.
 Runners – long stems that grow along the
surface of the soil
 Rhizomes – new stems that run
underground
 Suckers – new plants that form on roots
 Check and Reflect – page 115
Do all questions (1-5)
Check and Reflect
page 115
 1. Draw a diagram of the life cycle of seed
plants. Label each stage.
Seed stage – Contains the embryo, which uses
food to survive until it starts to photosynthesize
Seedling stage – Plants grow fast and produce
new leaves, roots, and stems
Adult stage – produces reproductive structures
(flower or cone in seed plants)
 2. What is a pollinator? What attracts
pollinators to flowers?
A pollinator is an organism that carries pollen
from one flower to the next. (Ex: insects,
bees, birds, bats) Pollinators are attracted to
flowers because inside the flower, nectar, a
sugary liquid, is found.
 3. Describe two ways that a seed plant can
reproduce without seeds.
A seed plant reproduces without seeds by
producing runners, which are long stems
that grow along surface of soil. Another way
is by producing rhizomes, which are stems
that run underground. A third way is by
reproducing from their roots and new plants
that form on these roots are called suckers.
 4. Describe how a nursery might produce
petunias to sell as bedding plants.
A nursery would use the method of grafting.
This occurs when one part of plant is
attached onto another plant. The two
sections eventually grow together.
 5. What did you learn about conifer trees in
this section that you didn’t know before?
Answers will vary.
They have male and female parts to
reproduce.