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

Question 1

What are 5 responses to temperature that plants undergo?

Answer 1

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

Question 2

explain transpiration

Answer 2

• 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

Question 3

explain the change in leaf orientation

Answer 3

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

Question 4

explain leaf fall

Answer 4

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

Question 5

explain seed dispersal

Answer 5

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

Question 6

explain Vernalisation

Answer 6

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