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25 terms

Pesticides and Conditions affecting Transpiration rate

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What is a Contact Pesticide?
Pesticides that are on the plant's surface and will kill any insects or fungi that touch it
What is a systemic Pesticide?
Pesticide that is absorbed into the tissue and than into the Phloem Tube. Killing insects or fungi that feed on the plant
Would it kill fungi where the spray of a systemic pesticide was not sprayed on?
Yes as the Fungi will eventually end up feeding on the pesticide
How does Temperature affect the transpiration rate?
Water evaporates from leaves of a plant in a hot day
How does Humidity affect the transpiration rate?
The moisture content of the air is higher therefore there is a less diffusion gradient from the leaf to the air.
How does wind speed affect the transpiration rate?
Water evaporates more quickly on a windy day
How does light intensity affect the transpiration rate?
Plant may open its stomata to supply CO2 for photosynthesis, which allows the water to evaporate from the leaves
How does Water Supply affect the transpiration rate?
If there is a short supply of water than the plant will close its stomata which stops water from diffusing out of the leaves
How does Closing stomata hinder the transpiration rate?
Plant lose most of their water through the stomata, therefore if the stomata are closed than not much water is lost
How does waxy cuticle hinder the transpiration rate?
Prevents water from escaping from the upper epidermis
How does hairy leaves hinder the transpiration rate?
Traps moisture in the air, which creates a less diffusion gradient from the leaves to the air
How does Cutting down on surface area hinder the transpiration rate?
Less water will evaporate from it, helps to conserve water
What are Mesophytes?
They are general leaves which have average conditions
Give an example of a Mesophyte
Pohutukawa
What does the leaf have? Describe its uses
Hairs (Tricombs) that traps moisture and increase humidity near stomata. This lowers the Transpiration rate
What are Hydrophytes? Give an Example
Found in aquatic conditions and an example of this is a Water Lily
Where is the stomata located on the hydrophyte?
On top, mostly open. This is to speed up the rate of transpiration
How well developed are the Hydrophytes roots?
Poorly developed, which allows water to diffuse in constantly
What are Xerophytes? Give an Example
Leaves/Plants in very arid conditions, usually exposed. An example is Cacti
What is around the stomata? Explain
Pits, which increase humidity levels, therefore reducing water loss
How does Photosynthesis occur in Xerophytes?
At night the Xerophytes open their stomata to obtain gases, and during the day time the reaction of photosynthesis occurs.
Why does Cacti have spines?
To reduce the surface area of leaves, and it also protects from animals that want the water of the Cacti. There is no Chloroplast on the Spines
What are marram grass?
Grass on the beach to stabilize the sand
What is the cross section of a piece of Marram Grass?
A curled up c
What is the Adaptations of the Marram Grass to reduce water loss?
There are stomata on the inside of the "C" which increases the humidity levels and therefore there will be less water loss.