Quiz 12 Questions and Answers

In your writing assignment, you noted a dim reflection of UV/blue light from an intact leaf. Why was the reflection dim rather than bright?
a.) penlight batteries were weak
b.) pigments absorb UV/blue light
c.) chlorophyll does not absorb UV/blue light
d.) fluorescence does not occur

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Pigments absorb UV/blue light

The evidence for this was found in your Figure 1 spectra. What was this evidence?
a.) no absorbance at 700nm
b.) high absorbance at 680nm
c.) high transmittance at 700nm
d.) high absorbance at 400nm

High absorbance at 400nm

Why did the leaf pigments in the intact leaf fail to fluoresce?
a.) chlorophyll does not fluoresce
b.) the penlight was too weak to excite the leaf pigments
c.) the absorbed energy was used in light reactions rather than released as light

The absorbed energy was used in light reactions rather than released as light

Why did the leaf pigments in the extract fluoresce?
a.) chlorophyll was excited by the light
b.) it showed that blue light is efficient in photosynthesis
c.) there was no electron transport system to receive the energy from chlorophyll

There was no electron transport system to receive the energy from chlorophyll

Why, when exposed to UV/blue light, did the extracted pigments fluoresce a deep-red wavelength?
a.) chlorophyll absorbed UV/blue light
b.) the chlorophyll electron excited by light had nowhere to go but back
c.) deep red light is longer in wavelength, and thus lower energy, than the other colors
d.) all of these

All of these

Three examples of mircoelements for plants.
a.) carbon
b.) oxygen
c.) nitrogen
d.) magnesium
e.) molybdenum
f.) copper
g.) potassium
h.) zinc

Molybdenum, copper, zinc

Abundant marcoelement, but bacteria/cyanobacteria must be put into soil.
a.) carbon
b.) oxygen
c.) nitrogen
d.) magnesium
e.) molybdenum
f.) copper
g.) potassium
h.) zinc

Nitrogen

Macroelement for plant chlorophyll, but a microelement for humans.
a.) carbon
b.) oxygen
c.) nitrogen
d.) magnesium
e.) molybdenum
f.) copper
g.) potassium
h.) zinc

Magnesium

The tissue conducting both up and down:
a.) xylem
b.) phloem
c.) cambium
d.) phloem fibers

Xylem

Transpiration takes place in:
A. Xylem
B. Phloem
C. Cortex
D. Pericycle
E. Endodermis

Xylem