Term
| Technical name for bean plant |
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Definition
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Term
| Equation for photosynthesis: |
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Definition
| 6CO2 + 6 H20 + Light -> C6H12O6 + 6O2 |
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Term
| What is conducted in the xylem? |
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Definition
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Term
| Are xylem cells dead or alive? |
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Definition
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Term
| What are some xylem elements? |
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Definition
Vessels: elongate cells placed end to end.
Tracheid: characterized by tapering ends and pitted walls without true perforations.
Lignin: autoflouresces blue under UV light |
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Term
| What does phloem conduct? |
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Definition
| sugars and other organic molecules |
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Term
| What are some phloem elements? |
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Definition
sieve tubes-cytoplasm of one cells is joined to adjacent cells
Companion cells |
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Term
| When are stomata generally opened? |
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Definition
| In the day and closed at night |
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Term
| How do stomata know to open at dawn? |
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Definition
Blue light receptors in the guard cell
Low CO2
Circadian rhythm |
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Term
| What do blue light receptors in guard cells do? |
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Definition
Stimulate proton pumps promoting uptake of K+
Drive photosynthesis and lower CO2 |
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Term
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Definition
Environmental stress (excessive transpiration) such as dehydration or exposure to Absicic acid
High CO2
Change in temperature |
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Term
| What is the state of the stomata when it is open? |
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Definition
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Term
| What is the state of the stomata when it is closed? |
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Definition
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Term
| What is hydropassive closure? |
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Definition
| The guard cells lose turgor and close due to low air humidity |
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Term
| What is hydroactive closure? (involving Co2) |
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Definition
| When guard cells lose turgor pressure and the stomata close due to an increase in CO2- Guard cells have CO2 sensors- they CO2 for respiration however |
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Term
| What is hydroactive closure? (involving ABA) |
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Definition
| ABA accumulates in the chloroplasts of the mesophyll cells and they become mostly dehydrated. Stored ABA is released outside of the cell so it can stream to the guard cells. The rate of ABA synthesis increases! |
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Term
| When is ABA production initiated? |
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Definition
| In stressful situations such as water loss or freezing. |
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Term
| What is the function of ABA that we are most concerned about? |
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Definition
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Term
| Why does water flow in and out of cells? |
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Definition
| The K+ concentration. If the K+ concentration is higher outside of the cell, the water will flow out. If the K+ concentration of the cell is higher within the cell, the water will flow in. |
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Term
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Definition
| It binds to guard cell receptors, activates signal transduction pathway, lowers solute concentration inside of guard cell, and thus, lowers cell turgor and closes stoma |
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Term
| What is the state of the stoma when the guard cells are turgid? |
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Definition
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Term
| What is the state of the stoma in bright light? |
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Definition
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Term
| What is the state of the stoma in low CO2? |
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Definition
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Term
| What is the state of the stoma in low ABA? |
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Definition
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Term
| What is the state of th stoma when there is a high concentration of K+ in the guard cells? |
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Definition
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Term
| What is the state of the stoma in high temperature? |
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Definition
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Term
| What is the state of the stoma in high photosynthesis? |
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Definition
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Term
| What is the state of the stoma in lots of water? |
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Definition
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Term
| What is the state of the stoma in when guard cells are flaccid? |
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Definition
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Term
| What is the state of the stoma in darkness? |
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Definition
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Term
| What is the state of the stoma when CO2 is high? |
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Definition
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Term
| What is the state of the stoma whe ABA is high? |
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Definition
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Term
| What is the state of the stoma when K+ is low in guard cells? |
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Definition
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Term
| What is hte state of the stoma when the temperature is low? |
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Definition
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Term
| What is the state of the stoma when photosynthesis is low? |
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Definition
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Term
| What is the state of the stoma when water is stressed? |
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Definition
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Term
| What do you call it if the force moving water is a concentration gradient? |
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Definition
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Term
| What do you call it if the force moving water is a potential gradient? |
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Definition
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Term
| What do you call it if the force moving water is a pressure gradient? |
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Definition
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Term
| What does conductance depend on? |
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Definition
| Resistance, size of stomata (open/closed?), density of stomata |
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Term
| What does the porometer measure? |
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Definition
| The resistance to the loss of water through the stomata |
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