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Chapter 37: Q37.2-1ITD (page 810)
How do the young leaves differ in appearance from the older leaves?
The color is the distinguishing factor between young and older leaves. The appearance of older leaves is greener than yellow-colored young leaves.
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Micronutrients are needed in very small amounts because
(A) most of them are mobile in the plant.
(B) most serve mainly as cofactors of enzymes.
(C) most are supplied in large enough quantities in seeds.
(D) they play only a minor role in the growth and health of the plant.
Making a footprint in the soil seems like an insignificant event. In a short essay (100鈥�150 words), explain how a footprint would affect the properties of the soil and how these changes would affect soil organisms and the emergence of seedlings.
The specific relationship between a legume and its mutualistic Rhizobium strain probably depends on
(A) each legume having a chemical dialogue with a fungus.
(B) each Rhizobium strain having a form of nitrogenase that works only in the appropriate legume host.
(C) each legume being found where the soil has only the Rhizobium specific to that legume.
(D) specific recognition between chemical signals and signal receptors of the Rhizobium strain and legume species.
Imagine taking the plant out of the picture in Figure 37.12. Write a paragraph explaining how soil bacteria could sustain the recycling of nitrogen before land plants evolved.
Acid precipitation has an abnormally high concentration of hydrogen ions (H+). One effect of acid precipitation is to deplete the soil of nutrients such as calcium (Ca2+), potassium (K+), and magnesium (Mg2+). Suggest a hypothesis to explain how acid precipitation washes these nutrients from the soil. How might you test your hypothesis?
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