Leaf Color In The Fall Test

Leaf Color In The Fall Test
Please fill out your email address in the first box and your name, ISA cert. no. in the second box. Answer the questions below and when you are finished, press submit.

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Name :

Question: 1. Most trees are genetically programmed to turn:
yellow.
red.
no color.
all of the above.

Question: 2. Anthocyanin benefits trees:
as a sunscreen.
as an antioxidant.
to help resist cold and drought.
all of the above.

Question: 3. Soils dictate fall colors:
if relatively low in nitrogen.
if very moist.
if very dry.
all of the above.

Question: 4. The change in color is not the result of:
the leaves dying.
the red pigment produced in the leaf.
the yellow pigment becoming dominant.
all of the above.

Question: 5. The red pigment is produced as a result:
the chlorophyll diminishing.
physiological functions.
freezing temperature.
all of the above.

Question: 6. The red pigment is produced as a result:
the tree protecting itself against insects.
the leaves dying.
the chlorophyll diminishing.
all of the above.

Question: 7. Anthocyanin is:
the orange pigment.
the green pigment.
the red pigment.
the purple pigment.

Question: 8. Anthocyanin does not occur in Europe because:
trees expend the energy to color their leaves yellow.
European trees do not have anthocyanin in their leaves.
aphids are attracted to yellow leaves.
all of the above.

Question: 9. According to another theory fall color began:
35 million years ago.
when many tree species evolved to become deciduous.
when mountain ranges enabled plant migration with the advance and retreat of the ice ages.
all of the above.

Question: 10. In Europe during the ice ages:
tree species did not survive the severe cold.
trees had no need to cope with many of the insects that became extinct.
trees did not expend efforts on producing red leaves.
all of the above.

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