Lesson 9
266
w w w . p e t e r s o n s . c o m / a r c o
ARCO
■
SAT II Subject Tests
Questions 91–92
It has been demonstrated that hormones within plants can exert influences on plant growth. The chart
below depicts the differential sensitivity of various parts of a certain plant to changing levels of plant
growth regulators. These results are based on laboratory studies and have not been confirmed on
plants growing freely in nature.
91. Which of the following will grow with the least
amount of plant growth regulators relative to
the other plant parts?
(A) primary root
(B) lateral root
(C) buds
(D) stem
(E) fruit
92. The terminal bud
of a stem is known to pro-
duce apical dominance in this plant. Which of
the following best describes this condition?
(A) As the fruit of the plant grows larger,
stem elongation occurs.
(B) As the fruit of the plant stops growing,
stem elongation occurs.
(C) Primary root
growth precedes lateral root
growth.
(D) As stem elongation occurs, lateral bud
growth is inhibited.
(E) As
stem growth decreases, terminal bud
growth increases.
Biology E/M Subject Test
267
ARCO
■
SAT II Subject Tests
w w w . p e t e r s o n s . c o m / a r c o
Questions 93–94
Interactions between mesoderm and its overlying epidermis can have profound effects. Several experi-
ments using the embryonic chicken demonstrate the results of such interactions. In the first experiment,
mesoderm from a feathered region of the chick is combined with ectoderm from a nonfeathered region. As
a result, the ectoderm produces feathers.
In a second experiment, mesoderm from a scaled area is com-
bined with ectoderm from a feather-producing area. The result is ectoderm, which produces scales.
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