If you carve your initials in the trunk of a tree, will they move up as the tree grows?
a. Yes, because a tree elongates from the ground up.
b. Yes, because secondary growth will cause them to move up.
c. Yes, because growth continues in all parts of a plant throughout its life.
d. No, because elongation occurs just below the tips of growing stems in the apical meristems.
Bark consists of
a. secondary phloem, cork cambium, and cork.
b. cork cambium and cork.
c. functioning xylem, secondary phloem, cork cambium, and cork.
d. cork only.
A woody plant lives through five years of drought, followed by five years of good growing conditions. The ring of xylem cells formed during the five good years will
a. be living, whereas those formed during the drought years will be dead.
b. be thicker than those formed during the drought years.
c. be thinner than those formed during the drought years.
d. conduct a higher ratio of sugar to water than those formed during the drought years.
In a showy flower such as a magnolia or rose, the flower parts that play the main role in attracting the notice of animal pollinators are the
A mature ovary, specialized as a vessel that houses and protects seeds, is a
d. seed coat.
The tallest plant on Earth is
a. a giant seed fern in southern Peru.
b. a 740-foot white oak tree in Illinois.
c. a 379-foot redwood tree in California.
d. a 500-foot kelp living off the coast of California.
The growth that pushes a root down through the soil takes place through
a. cell elongation behind the root tip.
b. differentiation of xylem cells in the apical meristem.
c. cell division in the apical meristem.
d. cell elongation at the tip of the root cap.
A vascular cambium cell divides to produce an inner and an outer daughter cell. Which of the following represents the probable fate of these cells?
a. Both cells will continue to divide without differentiating into specialized cells.
b. The inner cell will differentiate into xylem, and the outer cell will divide again.
c. The inner cell will differentiate into phloem, and the outer cell will differentiate into xylem.
d. Both cells continue to divide to produce wood.
A seed develops from a(n)
c. pollen grain.
Photosynthesis occurs in which type of plant tissue?
c. vascular cambium
d. epidermal tissue
New growth that increases stem length on a plant arises mainly from
a. apical meristems.
b. the tips of leaves.
c. the base of the stem.
d. the vascular cambium.
The genetically identical organisms that result from asexual reproduction are called
Which of the following flower parts produces female gametophytes?
How does the sperm of an angiosperm reach the egg?
a. via the pollen tube that grows from the ovule to reach the pollen grain on the stigma
b. by actively swimming down through the style to the egg
c. usually via an insect, which places sperm in the ovary while probing for nectar
d. via the pollen tube that grows from the pollen grain through the carpel tissues to the ovule
Which of the following cells provide flexible support to the growing parts of plants?
a. collenchyma cells
b. parenchyma cells
c. sieve-tube elements
d. sclerenchyma cells