section 1. (9) identify some responses of plants to temperature change Flashcards

1
Q

What are 5 responses to temperature that plants undergo?

A

1) transpiration
2) change in leaf orientation
3) leaf fall
4) seed dispersal
5) vernalisation

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2
Q

explain transpiration

A
  • evaporation of water from stomates cools the plants
    o Rate may increase with a rise in temperature
    o Many plants close their stomates at temps above 30 degrees to reduce water loss
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3
Q

explain the change in leaf orientation

A

to adjust the surface area of the plant exposed to the sun- preventing overheating and dehydration caused by excessive water loss

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4
Q

explain leaf fall

A

plants such as eucalypts drop their leaves during dry, hot weather to reduce surface area

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5
Q

explain seed dispersal

A

in response to fires plants such as the Hakeas do this because the soil will be nutrient rich and there will be a lack of competition

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6
Q

explain Vernalisation

A

some plants will not flower until they are exposed to a specific temperature for a specific period of time (tulips)

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