Activities Quiz
1.

Evergreen trees lose their leaves _____. (Activity 39A)

in the spring
in the summer
steadily all year
every fall
every winter


2.

Click on the diagram to start the animation.
The abscission layer is indicated by the letter _____. (Activity 39A)

A
B
C
D
E


3.

The breakdown of chlorophyll reveals the _____ pigments of a leaf. (Activity 39A)

carotenoid
xanthophylls
anthocyanin
melanin
phycoerythrin


4.

The formation of the abscission layer cuts off transport of substances to and from the leaf. As the concentration of sugar trapped within a leaf increases, _____ pigments are produced. (Activity 39A)

carotenoid
xanthophyll
anthocyanin
melanin
phycoerythrin


5.

The protective layer that forms between the abscission layer and the stem consists of _____. (Activity 39A)

a layer of green palisade cells
weak, colorless, thin-walled cells
mycorrhizae
irregularly shaped cells with very thick, lignified secondary walls
densely colored cells filled with a waxy layer


6.

After leaf abscission, growth will resume from the _____. (Activity 39A)

petiole
protective layer
palisade layer
axillary bud
abscission layer


7.

_____ trees lose their leaves in preparation for winter. (Activity 39A)

Fir
Spruce
Deciduous
Conifer
Pine


8.

For a short-day plant, the _____ is critical in determining if flowering will occur. (Activity 39B)

maximum number of hours of light
minimum number of hours of darkness
minimum number of hour of light
maximum number of hours of darkness
None of these is correct, since short-day plants are also known as day-neutral plants.


9.

For a long-day plant, the _____ is critical in determining if flowering will occur. (Activity 39B)

maximum number of hours of light
minimum number of hours of darkness
minimum number of hours of light
maximum number of hours of darkness
None of these is correct, since short-day plants are also known as day-neutral plants.


10.

Day-neutral plants flower regardless of _____. (Activity 39B)

night length
day length
photoperiod
day length or night length
day length, night length, or photoperiod


11.

Which of these would inhibit flowering in a short-day plant with a critical night length of 12 hours? (Activity 39B)

12 hours of light, 6 hours of dark, a flash of red light, a flash of far-red light, a flash of red light, a flash of far-red light, 6 hours of dark
12 hours of light, 6 hours of dark, a flash of red light, a flash of far-red light, 6 hours of dark
12 hours of light followed by 12 hours of dark
12 hours of light, 6 hours of dark, a flash of red light, 6 hours of dark
All of these regimens would inhibit flowering in a short-day plant with a critical night length of 12 hours.


12.

Which of these would stimulate flowering in a long-day plant with a critical night length of 12 hours? (Activity 39B)

12 hours of light, 6 hours of dark, a flash of red light, a flash of far-red light, a flash of red light, a flash of far-red light, 6 hours of dark
12 hours of light, 6 hours of dark, a flash of red light, a flash of far-red light, 6 hours of dark
12 hours of light followed by 12 hours of dark
12 hours of light, 6 hours of dark, a flash of red light, 6 hours of dark
8 hours of light and 16 hours of dark



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