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Questions and Answers
What effect does increasing light intensity have on the rate of transpiration?
What effect does increasing light intensity have on the rate of transpiration?
- It temporarily halts transpiration
- It decreases the rate of transpiration
- It increases the rate of transpiration (correct)
- It has no effect on transpiration
How does humidity affect the rate of transpiration?
How does humidity affect the rate of transpiration?
- Decreased humidity decreases transpiration
- Increased humidity increases transpiration
- Increased humidity decreases transpiration (correct)
- Humidity has no impact on transpiration
Which internal factor is associated with increasing the rate of transpiration?
Which internal factor is associated with increasing the rate of transpiration?
- Increased air spaces in the leaf (correct)
- Fewer stomata
- Thicker cuticle
- Decreased exposed surface area
What role do stomata play in the process of transpiration?
What role do stomata play in the process of transpiration?
What component of the plant is responsible for transporting water and nutrients?
What component of the plant is responsible for transporting water and nutrients?
What experimental device is used to measure the rate of transpiration?
What experimental device is used to measure the rate of transpiration?
When conducting an experiment to observe water loss in plants, what result would indicate transpiration is occurring?
When conducting an experiment to observe water loss in plants, what result would indicate transpiration is occurring?
Which of the following will decrease the rate of transpiration?
Which of the following will decrease the rate of transpiration?
What primarily drives the movement of water vapour out of the plant leaf during transpiration?
What primarily drives the movement of water vapour out of the plant leaf during transpiration?
Which of the following factors increases the rate of transpiration the most significantly?
Which of the following factors increases the rate of transpiration the most significantly?
Which process is primarily responsible for the cooling effect of transpiration in plants?
Which process is primarily responsible for the cooling effect of transpiration in plants?
How does an increase in temperature affect the transpiration rate?
How does an increase in temperature affect the transpiration rate?
Which of the following is NOT a common external factor affecting transpiration?
Which of the following is NOT a common external factor affecting transpiration?
What is the primary function of xylem in relation to transpiration?
What is the primary function of xylem in relation to transpiration?
Which experimental method could be used to study the rate of transpiration in a plant?
Which experimental method could be used to study the rate of transpiration in a plant?
What is a primary limitation of using a potometer in experiments?
What is a primary limitation of using a potometer in experiments?
What is necessary for proper assembly of a potometer under water?
What is necessary for proper assembly of a potometer under water?
How does excess humidity affect transpiration in plants?
How does excess humidity affect transpiration in plants?
What role does the xylem play in the transpiration process?
What role does the xylem play in the transpiration process?
What happens to a plant when transpiration exceeds water uptake?
What happens to a plant when transpiration exceeds water uptake?
What precaution should be taken when transferring a plant from one soil to another?
What precaution should be taken when transferring a plant from one soil to another?
Which factor must be controlled during an experiment studying the effect of light on transpiration?
Which factor must be controlled during an experiment studying the effect of light on transpiration?
Why should the leafy shoot be dried before starting a potometer experiment?
Why should the leafy shoot be dried before starting a potometer experiment?
Flashcards
Transpiration Rate
Transpiration Rate
The rate at which plants lose water vapor through their leaves.
Factors Affecting Transpiration
Factors Affecting Transpiration
Environmental conditions (light, humidity) and plant structure (number of stomata, leaf surface area) affect the rate of transpiration.
Light Intensity and Transpiration
Light Intensity and Transpiration
Higher light intensity generally leads to a higher transpiration rate as stomata open more to obtain CO2 for photosynthesis.
Humidity and Transpiration
Humidity and Transpiration
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Stomata and Transpiration
Stomata and Transpiration
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Xylem's Role
Xylem's Role
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Transpiration Experiment
Transpiration Experiment
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Plant Water Needs
Plant Water Needs
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Potometer
Potometer
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Transpiration
Transpiration
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Air bubbles in xylem
Air bubbles in xylem
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Wilting
Wilting
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Causes of wilting
Causes of wilting
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Preventing Air Bubbles
Preventing Air Bubbles
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Dry Leaf for Potometry
Dry Leaf for Potometry
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Plant Transfer Precautions
Plant Transfer Precautions
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Phloem function
Phloem function
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Sieve tubes
Sieve tubes
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Companion cells
Companion cells
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Transpiration's role
Transpiration's role
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Air current and transpiration
Air current and transpiration
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Temperature and transpiration
Temperature and transpiration
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Spongy mesophyll
Spongy mesophyll
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Study Notes
Transport in Plants
- Xylem function: Transport water and mineral ions, support
- Phloem function: Transport sucrose and amino acids
- Xylem and phloem are located in sections of roots, stems, and leaves of non-woody plants
- Root hair cells increase water and mineral absorption by increasing surface area
- Water pathway: root hair cells, root cortex cells, xylem, mesophyll cells (explanation of pathways is necessary if requested)
- Villi and microvilli: increase small intestine's internal surface area to aid nutrient absorption
- Xylem vessel structure: thick walls with lignin, no cell contents, joined end-to-end with no cross walls forming a long tube
- Importance of water in plants: Keeps cells turgid, needed for photosynthesis, part of cell structures
- Water absorption in plants: Water potential in soil > water potential in root hair cell; water moves through cells via osmosis to the xylem, then soaked by cell walls then to another
- Water movement through plants: Transpiration pull, root pressure, capillary action
- Transpiration: Loss of water vapor from leaves, main force for water ascent
- Factors affecting transpiration: Air current, temperature, light intensity, humidity, internal factors
- Number of stomata, air spaces, exposed surface area: Increase rate of transpiration
- Thickness of cuticle: Decreases the rate of transpiration
- Potometer: Measures rate of water uptake by a plant
- Potometer use: Assemble under water, dry leafy shoot before experiment
- Wilting: Plant loses water, cells become flaccid. Causes: transpiration > water uptake, high salt concentration
- Mechanism for water movement in plants: Transpiration pull creating a water potential gradient, loss of water from leaves reduces water potential, drawing water up
- Translocation: Transport of sucrose and amino acids from the source to the sink in the phloem via active transport/diffusion
- Source: Area of production of sugars
- Sink: Area of utilization or storage of sugars
- Water transport in hydrophytes: Roots: do not attach on bed of river; Stem: elastic to prevent breaks; Leaves: large air spaces for buoyancy, thin cuticle for less water loss
Plant Adaptations
- Roots: Deep to absorb water; branched structure to increase surface exposure
- Stem: Upright shape to minimize surface exposure to heat, succulent to store water
- Leaves: Small spines to reduce water loss, fewer stomata, hairs on underside to decrease air movement, reduce transpiration
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Description
This quiz covers the crucial concepts of how water, minerals, and nutrients are transported in plants through structures like xylem and phloem. It explores the roles of root hair cells and the importance of water absorption in maintaining plant health. Test your knowledge on plant structure and functions related to transport systems.
