chapter 35

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1

Which part of a plant absorbs most of the water and minerals taken up from the soil?

root hairs

2

What is the primary function of stems?

Maximization of photosynthesis by leaves

3

When you eat Brussels sprouts, you are eating _____.

large axillary buds

4

Some of the largest leaves in the world can be found on plants near the forest floor of dense
tropical rain forests. Which of the following precursors for photosynthesis is most likely limited
in these large leaves?

light

5

Leaf thickness represents a trade-off between _____.

water retention and carbon dioxide absorption

6

One important difference between the anatomy of roots and the anatomy of leaves is that
_____.

a waxy cuticle covers leaves but is absent from roots

7

Which of the following was a challenge to the survival of the first land plants?

desiccation

8

Trichomes _____.

repel or trap insects

9

Which structure is correctly paired with its tissue system?

tracheid — vascular tissue

10

The main source of water necessary for photosynthesis to occur in the leaf mesophyll is
_____.

soil via the xylem

11

The vascular bundle in the shape of a single central cylinder in a root is called the _____.

stele

12

Which of the following cell types retains the ability to undergo cell division?

a parenchyma cell near the root tip

13

Which of these is NOT an example of a parenchyma cell?

support cells near the outside of nonwoody stems

14

Which of the following have unevenly thickened primary walls that support young, growing
parts of the plant?

collenchyma cells

15

Which of the following is correctly paired with its structure and function?

sclerenchyma — supporting cells with thick secondary walls

16

Which of the following occurs in vascular land plants but not charophytes (stoneworts)?

lignin

17

Which of the following are water-conducting cells that are dead at functional maturity?

tracheids and vessel elements

18

Which of the following cells transport sugars over long distances?

sieve-tube elements

19

Plant meristematic cells _____.

are undifferentiated cells that produce new cells

20

Which of the following arise, directly or indirectly, from meristematic activity?

secondary xylem, leaves, dermal tissue, and tubers

21

Compared to most animals, the growth of most plant structure is best described as _____.

indeterminate

22

What is present in a shoot apical meristem region?

I, II, and III

23

Shoot elongation in a growing bud is due primarily to _____.

cell elongation localized in each internode

24

Apical meristems of dicots are at the tips of stems. Apical meristems of grasses are at ground
level or slightly below, concealed by the leaves. The leaves also have an intercalary meristem at
their bases. What does this mean when considering care of a lawn or soccer field?

If you mow two inches above ground level, both the apical and intercalary meristems can
keep producing new cells.

25

In a meristematic region, the cell plate during mitosis is perpendicular to the side of the stem.
In what direction will the stem grow?

vertically in height

26

Which of the following cells or tissues arise from lateral meristem activity?

secondary xylem

27

Cells produced by lateral meristems are known as _____.

secondary tissues

28

Which of the following can be used to determine a twig’s age?

Number of apical bud scar rings

29

A plant that grows one year, dies back, and then grows again the following year, produces
flowers and then dies would be considered _____.

annual

30

Which of the following is the correct sequence of the zones in the primary growth of a root,
moving from the root cap inward?

zone of cell division, zone of elongation, zone of differentiation

31

The driving force that pushes the root tip through the soil is primarily _____.

elongation of cells behind the root apical meristem

32

Mitotic activity by the apical meristem of a root makes which of the following more
possible?

increased delivery of water to the aboveground stem

33

Which of the following root tissues gives rise to lateral roots?

pericycle

34

As a youngster, you drive a nail in the trunk of a young tree that is 3 meters tall. The nail is
about 1.5 meters from the ground. Fifteen years later, you return and discover that the tree has
grown to a height of 30 meters. About how many meters above the ground is the nail?

1.5

35

You find a plant unfamiliar to you and observe that it has vascular bundles scattered
throughout the stem cross section. What do you conclude about the plant?

It is probably a monocot.

36

Monocot vascular bundles do not have a vascular cambium between the xylem and phloem.
This means that monocots _____.

do not produce wood in annual rings

37
card image

Refer to the figure above. A monocot stem is represented by _____.

II only

38
card image

Refer to the figure above. A woody eudicot is represented by _____.

IV only

39
card image

Refer to the figure above. A plant that is at least three years old is represented by _____.

IV only

40

Canada thistle is a dicot that spreads via growth from lateral roots. You want to use a root
miner insect for weed control. What would you need to observe in the underground growth to
verify that this weed spreads via lateral roots and not by underground stems?

a vascular bundle in the center surrounded by parenchyma tissue

41

A student examining leaf cross sections under a microscope finds many loosely packed cells
with relatively thin cell walls. The cells have numerous chloroplasts. What type of cells are they?

parenchyma

42

The veins of leaves are _____.
I) composed of xylem and phloem
II) continuous with vascular bundles in the stem and roots
III) finely branched to be in close contact with photosynthesizing cells

I, II, and III

43
card image

The main function associated with structure X is _____.

retention of water

44
card image

The main function associated with structure Y is _____.

absorption of carbon dioxide

45

Increasing the number of stomata per unit surface area of a leaf when atmospheric carbon
dioxide levels decline is most analogous to a human _____.

putting more red blood cells into circulation when atmospheric oxygen levels decline

46

Where is primary growth occurring in an old tree?

in young branches where leaves are forming

47

What tissue makes up most of the wood of a tree?

secondary xylem

48

A plant has the following characteristics: a taproot system, several growth rings evident in a
cross section of the stem, and a layer of bark around the outside. Which of the following best
describes the plant?

woody eudicot

49

If you were able to walk into an opening cut into the center of a large redwood tree, when
you exited from the middle of the trunk (stem) outward, you would cross, in order, _____.

the annual rings, new xylem, vascular cambium, phloem, and bark

50

Heartwood and sapwood consist of _____.

secondary xylem

51

Two examples of lateral meristems in plants are _____.

vascular cambium, producing secondary xylem; cork cambium, producing cork

52

Additional vascular tissue produced as secondary growth in a root originates from which
cells?

vascular cambium

53

Girdling is a procedure to kill unwanted tress by cutting a groove into the bark of the tree.
The groove must completely encircle the trunk and should penetrate into the wood to a depth of
at least 1/2-inch on small trees, and 1-3/2 inches on larger trees. Why does this procedure cause
tree death?

No sugars can be transported from the leaves to the roots.

54

Where are the youngest wood and the youngest bark in a tree trunk?

Youngest wood is toward the outside, near the vascular cambium; youngest bark is the inner
part, next to the vascular cambium.

55

The polarity of a plant is established when _____.

the shoot-root axis is established in the embryo

56

Growth and development of plant parts involves _____.
I) cell division to produce new cells
II) enlargement and elongation of cells
III) specialization of cells into tissues

I, II, and III

57

Totipotency is a term used to describe a cell's ability to give rise to a complete new
organism. In plants, this means that _____.

cell differentiation depends largely on the control of gene expression

58

Which of the following statements is true?

Homeotic genes often control morphogenesis.

59

The phase change of an apical meristem from the juvenile to the mature vegetative phase is
often revealed by _____.

a change in the morphology of the leaves produced