Exam (elaborations)
Biology 104-Exam -2 Questions and Answers
- Course
- Institution
Biology 104-Exam -2 Questions and Answers
[Show more]
Content preview
Biology 104-Exam #2 Questions andAnswers
Phylum Angiosperms - Answer -flowering plants that are 250,000-300,000 in number
1. Monocots- 1 side leaf (Corn)
2. Dicots- 2 side leaves (Bean) - Answer -The 2 large classes of Angiosperms
Monocots - Answer --Have 1 cotyledon/side leaf
-The flower parts, such as the petals, are in 3s or in multiples of threes
-The leaf mostly has parallel venation (ex-grasses)
-Have no cambiums, therefore, they do NOT grow very tall
-Their vascular bundles are scattered
-The pollen (sperm) has only 1 aperture (whole, thin are in the wall of the pollen grain)
Dicots - Answer --Have 2 cotyledons
-The flower parts are in 4s, 5s, or in multiples of either
-The leaf veins are in some sort of network
-They have cambiums--both vascular and cork
-Usually grow taller and wider than monocots because of cambiums.
-The vascular bundles are in a ring.
-The pollen grain has 3 apertures
-Variety in shapes and sizes
Tissue Patterns of Angiosperm Stems - Answer -1. Herbaceous Dicot Stem
2. Woody Dicot Stem
3. Monocot Stem
Herbaceous Dicot Stem - Answer --Non woody, soft stem, usually only lives for one
season (an annual)
-Example: Alfalfa Grass
-Mostly primary tissue
-Vascular bundles are in rings-this separates the inner pith from the outer cortex
-Pith is in the center and is made of parenchyma
-Xylem is on the inside and carries water upward
-Phloem is on the outside and carries sap downward
-The vascular cambium is between xylem and phloem
Woody Dicot Stem - Answer --When it's young, the tissue looks like herbaceous
, -As it matures, Secondary Tissue (Xylem or Wood) is the most obvious difference
-Wood shows seasonal growth, this is the key!
-Springwood (early wood) shows larger vessels because sap going up.
-Summerwood (late wood) shows smaller vessels
-Together, spring/summer wood make an annual ring (one ring).
-Age can be determined by counting the rings.
-The easiest way to count rings is with a increment borer (tool).
As trees age, Parenchyma may grow into the conducting cells--forming TYLOSES,
which stops conduction.
-Resin, gum, and tannin accumulate--forming dark heartwood
-The lighter, still functioning, Xylem is Sapwood.
Bark - Answer -All the tissue outside the Cork Cambium--this includes Phloem carrying
the sap down.
Monocot Stem - Answer --These are soft
-The vascular bundle looks like a monkey head. Phloem is the forehead--it's always on
the OUTSIDE carrying sap down. Xylem is the nose and eyes, carrying water UP.
-There is NO cambium
-The cover is the epidermis
The vascular bundles are scattered.
1. Spiral- where the leaves alternate
2. Paired- leaves are oppositely arranged
3. Whorls- when there are 3 or more leaves - Answer -In Woody Stem Anatomy, what
are the 3 different leaf arrangements?
Node - Answer -The place where a leaf or branch arises
Internode - Answer -The space in between 2 nodes
Petiole - Answer -The stalk that a leaf has which attaches it to the stem
Axil - Answer -The angle between the Petiole and Stem
Axillary Bud - Answer --Located in the axil
-May become stems or flowers
-Each bud is protected by bud scales
Terminal Bud - Answer -A bud that is located at the end of each branch
Bud Scale Scar - Answer -A ring that marks the location of a terminal bud in season's
past
Stipules - Answer -Tiny paired leaves at the base of the petiole
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller millyphilip. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
73314 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now