Biology Unit 3 Test 1
Homeostasis- ✅✅ It is the body’s process of keeping a set point while
there are internal and external changes.
Meristematic Tissue- ✅✅ This is like the stem cells of the plant kingdom. It
is a fast growing tissue that will change into one of the other types as the
plant needs it.
Dermal Tissue- ✅✅ This is the outer protective tissues of the plant. The
outer layer is called epidermis for herbaceous plants and is one cell thick.
Periderm for woody plants and is several cells thick. Cork is an example.
Stomata- ✅✅ Which are guard cells that open the plant up to the air, or
close it off to prevent water loss. Part of the Dermal.
Trichomes- ✅✅ Which are the fuzzy hairs that you can find on the stems
and leaves of plants. They help to cool the plant and prevent water loss.
part of the Dermal.
Root Hairs- ✅✅ Are specialized cells on the roots increase the surface
area of the root with the soil so that the plant can absorb more water and
nutrients. Part of the Dermal.
Ground Tissue- ✅✅ This is the base tissue of a plant and do jobs like
photosynthesis, storage and support. It is the general main type of tissue in
a plant.
Vascular Tissue- ✅✅ This is the arteries and veins of the plant that will
transport things around the plant. It is comprised of two layers. Xylem and
Phloem.
Xylem- ✅✅ Which transports water and nutrients up from the roots to the
rest of the plant to use. Layer of Vascular Tissue.
, Phloem- ✅✅ Which transports sugars down from the leaves to the rest of
the plant to use as a fuel source. Layer of Vascular Tissue.
Roots- ✅✅ Take in water and nutrients from the soil. Anchor the plant
against wind and erosion. To Store carbohydrates produced by
photosynthesis.
Stems- ✅✅ Can be herbaceous or woody. Their main goal is support for
the plant. Though herbaceous stems also help with photosynthesis.
Leaves- ✅✅ It’s main purpose is to carry out photosynthesis. The upper
surface can be waxy to prevent water loss. It has guard cells that can open
and close to allow for gas exchange.
Positive Feedback Loop- ✅✅ When some hormones tell the plant to do
more of what it is doing.
Reflex Arc-✅✅ A fast stimulus response that travels through the spine to
protect the body.
Neuron- ✅✅ It is the structural and functional unit of the nervous system.
They function to transmit information throughout the nervous system. It
consists of three parts: Cell Body, Dendrites, and Axon.
Resting Potential-✅✅ High concentration of sodium ions outside, low
concentration of potassium ions
Positive charges inside membrane due to high potassium, low sodium
Specialized channels for movement of sodium and potassium
Voltage difference of -70 mV
Threshold Potential- ✅✅ If there is enough stimulus and the membrane
charge changes enough then the process cannot be stopped and the nerve
will fire. If there is not enough, the cell will go back to Rest.
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