AIM SWBAT describe the process of growth in
AIM: SWBAT describe the process of growth in plants Please Do Now: 1) What is the most important environmental factor in determining when a seed germinates? 2) Where is energy and resources stored within seeds?
Agenda �Do Now �Data Analysis �Growth Notes �Private Life of Plants: “Growing”
DATA ANALYSIS: Growth Hormones �Background: IAA is a plant hormone, like testosterone, insulin, and estrogen are hormones in animals �What does IAA do? How does it do it? We will discover!
DATA ANALYSIS: Growth Hormones Leaf �Chart 1. What is measured on the X axis? 2. What is measured on the Y-axis? 3. What happens when you apply IAA to leaves? 4. How long does it take for IAA to have an effect?
DATA ANALYSIS: Growth Hormones Suc = sucrose, a sugar Leaf �Chart 1. What is measured on the X axis? 2. What is measured on the Y-axis? 3. What happens when you apply IAA to leaves? 4. What happens when you apply sucrose to leaves? 5. What happens when you apply both?
DATA ANALYSIS: Growth Hormones IAA conc. = 25 m. M �Chart 1. IAA conc. = 3 m. M 1. What is measured on the X axis? 2. What is measured on the Y-axis? 3. On what side of the shoot is the concentration of IAA higher? 4. Would this make plants grow towards light or away from light?
DATA ANALYSIS: Growth Hormones IAA conc. = 25 m. M �Chart 1. IAA conc. = 3 m. M 1. What is measured on the X axis? 2. What is measured on the Y-axis? 3. On what side of the shoot is the concentration of IAA higher? 4. Would this make plants grow towards light or away from light?
DATA ANALYSIS: Growth Hormones IAA conc. = 25 m. M �Chart 1. IAA conc. = 3 m. M 1. What is measured on the X axis? 2. What is measured on the Y-axis? 3. Does a given concentration of auxin have the same effect in the roots as it does in shoots (aboveground parts)?
Unifying question �If plants did not have auxin, how do you think they would grow? Use information from particular charts to support your answer.
What part of the plant is growing? �growth largely takes place in the meristems �Meristems are the places in the plant with highly active growth, where cells are rapidly dividing and expanding
Meristems �two main meristems (and smaller side ones) �shoot apical meristem = aboveground growth �root apical meristem = belowground growth
Meristem
Meristems �If the apical meristem is damaged, it has to either be replaced by a secondary one or the plant will cease to grow vertically �Meristems = stem cells �Division and growth are controlled by the signal hormone auxin
Why do most plants grow upwards? �A plant grows vertically because only one bud is getting lots of auxin hormone �This is the dominant bud and is why plants grow generally upward rather than outward
Summarize �Meristems _______________.
Summarize �Meristems __are the parts of the plant where most of the growth takes place_.
During the video �On your data analysis looseleaf, please answer these two questions: � 1. Why does the cheese plant grow the way it does? � 2. What does the narrator call the leaves of the sycamore tree?
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