1. How do plants maintain homeostasis to stay alive?
1. Grasshopper Dissection Lab
2. Missing Homework Assignments
3. 18.1 through 18.8 notes
1. After school help on Thursday of next week
Describe a feedback loop.
Starred thought of the Day
*There are two types of people in this world: those who make the time and those who never have the time. Lose the latter.*
Today I gave out extra credit for doing your assigned notes 18.1 through 18.8 for homework. We don’t just read/ do the notes for nothing- it’s a tool to help you learn.
The questions we went over today in class.
What can get into/out of stomates?
The major items that can be exchanged through stomates are water, carbon dioxide, and oxygen.
Plants found in drier climates are going to probably have what kind of rates of transpiration?
Plants found in drier climates will want lower rates of transpiration to conserve water and prevent too much water loss.
How do some plants overcome soil that is missing necessary nutrients, like nitrogen? (Hint: Insectivorous Plants)
The Venus Flytrap, Sundew, and Pitcher Plant all get the missing elements that they require from the breakdown of insects.
What cellular processes do plant cells complete?
Plant cells complete both photosynthesis AND cellular respiration.
Contrast the Xylem and the Phloem
Xylem- transports water from the roots through the stem to the leaves.
Phloem- transports sap which contains amino acids and sugars throughout the plant (similar to diffusion, from area of high concentration to area of lower concentration)
You’re in an area in which you know there is water deep underground, and see plants in that area. What kind of root system do you think these plants have?
These plants would most likely have a taproot system, to reach the water stored deep in the ground. Fibrous roots would not be able to get this done.
Where do plants get their mass from?
Plants get their mass mostly from the air, specifically Carbon Dioxide. Plants make sugars which not only provide storage of energy, but make up the structure of the plant cells. Cellulose (the major component of the cell wall) is made of sugars.
Describe plants in drier places- particularly their guard cells.
Most make the realization that the guard cells are specialized to save water. Many make the comparison of having more guard cells- actually, some just have guard cells that open at night to lose less water.
Describe what happens when plants don’t get enough water.
Plants that don’t get enough water lose their turgor pressure and wilt. Without this pressure, water may be unable to get to the leaves for photosynthesis and the plant will die.
1. Missing assignments to me ASAP!