<p>
</p>
<p>Because secondary growth (which thickens and adds girth) is the only type of growth occurs on the older regions of a tree, such as the near of base of the trunk. There comes a certain point in plant development where a woody plant will stop elongating due to primary growth in specific sections, and secondary growth will take place. The only elongation that will occur in woody parts is near the apical meristem, which will just generate new roots and shoots.</p>
<p>But the question just said that it grows in height…? You’re saying it only grows down?</p>
<p>I wish I was better at explaining this lol.</p>
<p>The tree is growing in height, but the it’s not elongating directly from the base of the trunk. The growth in height can be attributed to the higher regions (such as the branches) of the tree. Trees (and woody plants) grow in a different fashion - kind of like a section (usually the one produced first) will elongate in one year and then in the subsequent years, they just becomes thicker due to secondary growth.</p>
<p>
</p>
<p>I think mentioning roots might have created some confusion. Sorry. In this case, it’s really the growth in the shoots that contributes to the increase in height.</p>
<p>My class is now on the circulatory system of the animal form and function unit :/. Is there anyone out there whose class is still on this chapter? :(</p>
<p>^ We just started the chapter on the genetics of viruses and bacteria. </p>
<p>We’re really behind.</p>
<p>^I know your post should’ve made me feel better, but it didn’t. I seriously don’t remember learning anything about the genetics of viruses and bactera 
--either we never covered it or I totally forgot about everything I’ve previously learned. This is so depressing.</p>
<p>xrCalico, we haven’t done ANYTHING haha. We have spent almost all our time doing labs, but our teacher doesn’t teach us what we’re supposed to be learning from the labs, so its all pretty useless. All my Bio knowledge is Cliffnotes. I still need to do animal form and function, finish up plants, and review everything. I haven’t even taken a practice test and we were never taught to do an essay. I am skipping Animal Behavior because it is such a small portion of the exam… does anyone think thats stupid?</p>
<p>Okay running, I understand the tree thing now.</p>
<p>Sorry about that. </p>
<p>For my class, it’s the opposite. We go into such detail and depth - that’s impossible to forget certain things. Unfortunately, the trade-off is we can’t cover much material. We still have 30+ chapters left. It’s gonna be a difficult few weeks.</p>
<p>
</p>
<p>You might as well - from the practices I’ve seen, animal behavior generates one to two questions for MC. For the FRQ - I can’t make any promises there.</p>
<p>Okay, now that made me feel slightly better :). I don’t even know what the AP bio format is yet, so I better go look that up.</p>
<p>Also, I signed up for AP Environmental Sci as I was planning on self studying it. So far, I haven’t even started looking into the course, and I have only like two more weeks left before the exam. Anyone has any experience with the environmental science course? I was told that it shouldn’t be that hard since the other science courses cover much of the material that’s on the test, like ecology and everything…</p>
<p>And I have to start self studying the C portion of calculus before the end of this month since I signed up for the BC exam after taking only the AB course. This is just great :(.</p>
<p>(Sorry I just hijacked this thread with my annoying rant.)</p>
<p>^I took the AP Environmental Course and I can say that it has a huge overlap with the Ecology portion of AP Biology and certain portions of AP Human Geography. After doing Ecology in AP Bio, I would just read through a prep book like PR and understand the stuff that you might not have gone over. It shouldn’t be too difficult if you start soon, but don’t procrastinate. Oh, and good luck with all your exams, especially your self-studies. It looks like you might have bitten off more than you can chew, just try to swallow it all down by May.</p>
<p>I took a college environmental science class. Although it was extremely easy, most of the information doesn’t overlap. Ecology does, but not some other things. You could do it in two weeks with nothing else, but you can’t do it with Bio I think.</p>
<p>Thanks Harambee and santeria! I intially decided on taking the exam at the beginning of the year, but ever since the beginning of March senioritis has kicked in and I don’t feel like doing anything anymore :p. And my school doesn’t offer environmental sci, so I’ll feel bad if I have to ask our AP coordinator right now to cancel the exam now that he has ordered it already:/. And in addition to that, lately I’ve decided on attending a college that doesn’t offer any credit for AP exams, and hence I’ve lost almost all of my motivation to study. </p>
<p>It’s okay, I’m so used to this kind of procrasination. Besides, if I get like a two, it doesn’t really matter either. Okay, back to AP Bio discussion :).</p>
<p>May I ask what college? Thats very strange. But yeah, if I were you I definitely wouldn’t do it. Theres no point in studying for or even taking a test that doesn’t help you.</p>
<p>Does anyone else find that a lot of the questions are about cellular respiration and photosynthesis or very specific animal function questions?</p>
<p>Indian, the test is supposed to be 8% photosynthesis/cellular respiration and 10% animal form and function.</p>
<p>The greatest number of mitotic divisions occurs in:
A. Meristematic tissue
B. Xylem
C. Phloem
D. Guard Cells
E. Cork</p>
<p>A. Meristematic tissue, which is constantly dividing and is responsible for primary growth. It is found at the tips of roots and stems</p>
<p>Describe the cell cycle. Include the stages and major events that occur in each stage in chronological order. Explain why/how cells are stimulated to divide. What happens to the DNA during the cell cycle- is it functional or “disabled”?</p>
<p>
</p>
<p>xrCalico23 will be attending Harvard, where Advanced Placement credit is only applicable to those wishing to graduate ahead of schedule.</p>
<p>^yes, second that :p. (Sorry santeria, I logged out yesterday before I saw your post.)</p>
<p>The cell cycle is essentially a regular sequence of cell growth and division,</p>
<p>The stages include : Interphase [g1, S, g2] , Mitosis and Cytokinesis. </p>
<p>G1 - period of intense growth and biochemical activity
S - phase where DNA is replicated/synthesized
G2 - when the cell continues to grow and completes preparations for cell division. </p>
<p>Mitosis consists of the nuclear division of cells.</p>
<p>Prophase - Chromatin in the nucleus begins to condense and the nucleolus disappears. Centrioles begin moving to opposite ends of the cell and fibers extend from the centromeres. </p>
<p>Prometaphase - The nuclear membrane dissolve and some proteins attach to the centromeres creating the kinetochores. Microtubules attach at the kinetochores. </p>
<p>Metaphase - Homologous chromosomes line up in the center on the imaginary metaphase plate.</p>
<p>Anaphase - The paired chromosomes separate at the kinetochores and move to opposite sides of the cell.</p>
<p>Telophase - Chromatids arrive at opposite poles of cell, and new membranes form around the daughter nuclei.</p>
<p>Cytokinesis - In animal cells, cytokinesis results when a fiber ring composed of a protein called actin around the center of the cell contracts pinching the cell into two daughter cells, each with one nucleus. In plant cells, the rigid wall requires that a cell plate be synthesized between the two daughter cells.</p>
<p>The activation of cyclin-dependent kinase (Cdk) enzymes provide the necessary stimulation, sometimes cells have density dependent inhibition or contact inhibition. </p>
<p>Not sure about the last part…</p>