BIO 2 EXAM STUDY GUIDE 2026 PRACTICE
QUESTIONS AND SOLUTIONS
◉2) The Brazil nut tree, Bertholletia excels (n = 17), is native to tropical
rain forests of
South America. It is a hardwood tree that can grow to over 50 meters
tall, is a
source of high-quality lumber, and is a favorite nesting site for harpy
eagles. As
the rainy season ends, tough-walled fruits, each containing 8-25 seeds
(Brazil
nuts), fall to the forest floor. Brazil nuts are composed primarily of
endosperm.
About $50 million worth of nuts are harvested each year. Scientists have
discovered that the pale yellow flowers of Brazil nut trees cannot
fertilize
themselves and admit only female orchid bees as pollinators. The agouti
(Dasyprocta spp.), a cat-sized rodent, is the only animal with teeth
strong enough
to crack the hard wall of Brazil nut fruits. It typically eats some of the
seeds,
buries others, and leaves still others inside the fruit, which moisture can
now
,enter. The uneaten seeds may subsequ . Answer: B
◉3) The fruit of the mistletoe, a parasitic angiosperm, is a one-seeded
berry. In
members of the genus Viscum, the outside of the seed is viscous (sticky),
which
permits the seed to adhere to surfaces, such as the branches of host
plants or the
beaks of birds. What should be expected of the fruit if the viscosity of
Viscum
seeds is primarily an adaptation for dispersal rather than an adaptation
for
infecting host plant tissues?
a)It should be colored so as to provide it with camouflage.
b)It should be nutritious.
c)It should contain chemicals that cause birds to fly to the ground and
vomit.
d)It should secrete enzymes that can digest bark.
e)It should be drab in color . Answer: B
◉4) In a typical angiosperm, what is the sequence of structures
encountered by the tip
of a growing pollen tube on its way to the egg?
1. micropyle
,2. style
3. ovary
4. stigma
a)1→→→4→→→2→→→3
b)3→→→2→→→4→→→1
c)1→→→3→→→4→→→2
d)4→→→3→→→2→→→1
.
e)4→→→2→→→3→→→1 . Answer: E
◉5) Angiosperms are the most successful terrestrial plants. Which of the
following
features is unique to them and helps account for their success?
a)wind pollination
b)dominant gametophytes
c)sperm cells without flagella
d)fruits enclosing seeds
e)embryos enclosed within seed coats . Answer: D
◉6) Which of the following flower parts develops into the pulp of a
fleshy fruit?
a)stigma
, b)ovule
c)ovary
d)micropyle
.
e)style . Answer: C
◉7) Which of the following flower parts develops into a seed?
a)ovule
b)stamen
c)ovary
d)fruit . Answer: A
◉8) Hypothetically, one of the major benefits of double fertilization in
angiosperms is to
a)emphasize embryonic survival by increasing embryo size.
b)coordinate developmental timing between the embryo and its food
stores.
c)decrease the potential for mutation by insulating the embryo with other
cells.
d)promote diversity in flower shape and color.
e)increase the number of fertilization events and offspring produced. .
Answer: B
QUESTIONS AND SOLUTIONS
◉2) The Brazil nut tree, Bertholletia excels (n = 17), is native to tropical
rain forests of
South America. It is a hardwood tree that can grow to over 50 meters
tall, is a
source of high-quality lumber, and is a favorite nesting site for harpy
eagles. As
the rainy season ends, tough-walled fruits, each containing 8-25 seeds
(Brazil
nuts), fall to the forest floor. Brazil nuts are composed primarily of
endosperm.
About $50 million worth of nuts are harvested each year. Scientists have
discovered that the pale yellow flowers of Brazil nut trees cannot
fertilize
themselves and admit only female orchid bees as pollinators. The agouti
(Dasyprocta spp.), a cat-sized rodent, is the only animal with teeth
strong enough
to crack the hard wall of Brazil nut fruits. It typically eats some of the
seeds,
buries others, and leaves still others inside the fruit, which moisture can
now
,enter. The uneaten seeds may subsequ . Answer: B
◉3) The fruit of the mistletoe, a parasitic angiosperm, is a one-seeded
berry. In
members of the genus Viscum, the outside of the seed is viscous (sticky),
which
permits the seed to adhere to surfaces, such as the branches of host
plants or the
beaks of birds. What should be expected of the fruit if the viscosity of
Viscum
seeds is primarily an adaptation for dispersal rather than an adaptation
for
infecting host plant tissues?
a)It should be colored so as to provide it with camouflage.
b)It should be nutritious.
c)It should contain chemicals that cause birds to fly to the ground and
vomit.
d)It should secrete enzymes that can digest bark.
e)It should be drab in color . Answer: B
◉4) In a typical angiosperm, what is the sequence of structures
encountered by the tip
of a growing pollen tube on its way to the egg?
1. micropyle
,2. style
3. ovary
4. stigma
a)1→→→4→→→2→→→3
b)3→→→2→→→4→→→1
c)1→→→3→→→4→→→2
d)4→→→3→→→2→→→1
.
e)4→→→2→→→3→→→1 . Answer: E
◉5) Angiosperms are the most successful terrestrial plants. Which of the
following
features is unique to them and helps account for their success?
a)wind pollination
b)dominant gametophytes
c)sperm cells without flagella
d)fruits enclosing seeds
e)embryos enclosed within seed coats . Answer: D
◉6) Which of the following flower parts develops into the pulp of a
fleshy fruit?
a)stigma
, b)ovule
c)ovary
d)micropyle
.
e)style . Answer: C
◉7) Which of the following flower parts develops into a seed?
a)ovule
b)stamen
c)ovary
d)fruit . Answer: A
◉8) Hypothetically, one of the major benefits of double fertilization in
angiosperms is to
a)emphasize embryonic survival by increasing embryo size.
b)coordinate developmental timing between the embryo and its food
stores.
c)decrease the potential for mutation by insulating the embryo with other
cells.
d)promote diversity in flower shape and color.
e)increase the number of fertilization events and offspring produced. .
Answer: B
