Choose the option that best describes the relationship between the cell wall thickness of parenchyma cells versus sclerenchyma cells.
A) The cell walls of parenchyma cells are thinner than those of sclerenchyma cells.
B) The cell walls of parenchyma cells are thicker than those of schlerenchyma cells.
C) The cell walls of both types of cells are roughly equal.
D) The thickness of the cell walls for both types of cells is too variable for a comparison to be made.
A
Which structure is incorrectly paired with its tissue system?
A) root hair - dermal tissue
B) palisade parenchyma - ground tissue
C) guard cell - dermal tissue
D) companion cell - ground tissue
E) tracheid - vascular tissue
D
Which of the following is derived from the ground tissue system?
A) root hair
B) cuticle
C) periderm
D) pith
E) phloem
D
Land plants are composed of all of the following tissue types except
A) mesodermal.
B) epidermal.
C) meristematic.
D) vascular.
E) ground tissue.
A
Vascular plant tissue includes all of the following cell types except
A) vessel elements.
B) sieve cells.
C) tracheids.
D) companion cells.
E) cambium cells.
E
Which cells are no longer capable of carrying out the process of DNA transcription?
A) tracheids
B) mature mesophyll cells
C) companion cells
D) meristematic cells
E) glandular cells
A
________ is to xylem as ________ is to phloem.
A) Sclerenchyma cell; collenchyma cell
B) Apical meristem; vascular cambium
C) Vessel element; sieve-tube member
D) Cortex; pith
E) Vascular cambium; cork cambium
C
CO₂ enters the inner spaces of the leaf through the
A) cuticle.
B) epidermal trichomes.
C) stoma.
D) phloem.
E) walls of guard cells.
C
Which of the following cells transport sugars over long distances?
A) parenchyma cells
B) collenchyma cells
C) sclerenchyma cells
D) tracheids and vessel elements
E) sieve-tube elements
E
Which of the following have unevenly thickened primary walls that support young, growing parts of the plant?
A) parenchyma cells
B) collenchyma cells
C) sclerenchyma cells
D) tracheids and vessel elements
E) sieve-tube elements
B
Which of the following are most responsible for supporting mature, nongrowing parts of the plant?
A) parenchyma cells
B) collenchyma cells
C) trichomes
D) tracheids and vessel elements
E) sieve-tube elements
D
The vascular bundle in the shape of a single central cylinder in a root is called the
A) cortex.
B) stele.
C) endodermis.
D) periderm.
E) pith.
B
One important difference between the anatomy of roots and the anatomy of leaves is that
A) only leaves have phloem and only roots have xylem.
B) root cells have cell walls and leaf cells do not.
C) a waxy cuticle covers leaves but is absent from roots.
D) vascular tissue is found in roots but is absent from leaves.
E) leaves have epidermal tissue but roots do not.
C
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?
A) parenchyma
B) xylem
C) endodermis
D) collenchyma
E) sclerenchyma
A
Compared to most animals, the growth of most plants is best described as
A) perennial.
B) weedy.
C) indeterminate.
D) derivative.
E) primary.
C
A vessel element would likely lose its protoplast in which section of a root?
A) zone of cell division
B) zone of elongation
C) zone of maturation
D) root cap
E) apical meristem
C
Gas exchange, which is necessary for photosynthesis, can occur most easily in which leaf tissue?
A) epidermis
B) palisade mesophyll
C) spongy mesophyll
D) vascular tissue
E) bundle sheath
C
Which of the following best describes advantages conferred by compound leaves versus simple leaves?
A) There's a greater chance of capturing photons in intermittently shady areas.
B) There is less chance of damage in high-wind areas.
C) There's a reduced chance of herbivory.
D) There is less surface area for water loss.
E) There's a greater chance of capturing photons in intermittently shady areas and less chance of damage in high-wind areas.
E
Water is most likely to enter a mesophyll cell
A) as a gas.
B) as a liquid.
C) covalently bound to sugars.
D) coupled to ion transport.
E) via endocytosis.
B
Plants contain meristems whose major function is to
A) attract pollinators.
B) absorb ions.
C) photosynthesize.
D) produce more cells.
E) produce flowers.
D
A cell that is most likely to retain the ability to divide, perform metabolic functions, and store photosynthate would be a
A) parenchyma cell in a leaf.
B) vessel element in the vascular system.
C) endodermal cell in a root.
D) bark cell.
E) fiber cell.
A
Which of the following cell types is least likely to be capable of cell division?
A) mesophyll cell in a developing leaf
B) parenchyma cell 2 mm from the tip of a root
C) parenchyma cell in a dormant axillary bud
D) functional tracheid cell in a stem
D
The driving force that pushes the root tip through the soil is primarily
A) continuous cell division in the root cap at the tip of the root.
B) continuous cell division just behind the root cap in the center of the apical meristem.
C) elongation of cells behind the root apical meristem.
D) the elongation of root hairs.
E) continuous cell division of root cap cells.
C
Shoot elongation in a growing bud is due primarily to
A) cell division at the shoot apical meristem.
B) cell elongation directly below the shoot apical meristem.
C) cell division localized in each internode.
D) cell elongation localized in each internode.
E) cell division at the shoot apical meristem and cell elongation directly below the shoot apical meristem.
D
Axillary buds
A) are initiated by the cork cambium.
B) have dormant meristematic cells.
C) are composed of a series of internodes lacking nodes.
D) grow immediately into shoot branches.
E) do not form a vascular connection with the primary shoot.
B
The following question is based on parts of a growing primary root.
I. root cap
II. zone of elongation
III. zone of cell division
IV. zone of cell maturation
V. apical meristem
Which of the following is the correct sequence from the growing tips of the root upward?
A) I, II, V, III, IV
B) III, V, I, II, IV
C) II, IV, I, V, III
D) IV, II, III, I, V
E) I, V, III, II, IV
E
Which of the following is incorrectly paired with its structure and function?
A) sclerenchyma - supporting cells with thick secondary walls
B) periderm - protective coat of woody stems and roots
C) pericycle - waterproof ring of cells surrounding the central stele in roots
D) mesophyll - parenchyma cells functioning in photosynthesis in leaves
E) ground meristem - primary meristem that produces the ground tissue system
C
Which of the following root tissues gives rise to lateral roots?
A) endodermis
B) phloem
C) cortex
D) epidermis
E) pericycle
C
Pores on the leaf surface that function in gas exchange are called
A) hairs.
B) xylem cells.
C) phloem cells.
D) stomata.
E) sclereids.
D
Which of the following is a true statement about growth in plants?
A) Only primary growth is localized at meristems.
B) Some plants lack secondary growth.
C) Only stems have secondary growth.
D) Only secondary growth produces reproductive structures.
E) Monocots have only primary growth, and eudicots have only secondary growth.
B
All of the following cell types are correctly matched with their functions except
A) mesophyll–photosynthesis.
B) guard cell–regulation of transpiration.
C) sieve-tube member–translocation.
D) vessel element–water transport.
E) companion cell–formation of secondary xylem and phloem.
E
What would be a plant adaptation that increases exposure of a plant to light in a dense forest?
A) closing of the stomata
B) lateral buds
C) apical dominance
D) absence of petioles
E) intercalary meristems
C
A person working with plants may reduce the inhibition of apical dominance by auxin via which of the following?
A) pruning shoot tips
B) deep watering of the roots
C) fertilizing
D) treating the plants with auxins
E) feeding the plants nutrients
A
Which of the following cells or tissues arise from lateral meristem activity?
A) secondary xylem
B) leaves
C) trichomes
D) tubers
E) cortex
A
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?
A) herbaceous eudicot
B) woody eudicot
C) woody monocot
D) herbaceous monocot
E) woody annual
B
Cells produced by lateral meristems are known as
A) dermal and ground tissue.
B) lateral tissues.
C) pith.
D) secondary tissues.
E) shoots and roots.
D
Which of the following is a true statement?
A) Flowers may have secondary growth.
B) Secondary growth is a common feature of eudicot leaves.
C) Secondary growth is produced by both the vascular cambium and the cork cambium.
D) Primary growth and secondary growth alternate in the life cycle of a plant.
E) Plants with secondary growth are typically the smallest ones in an ecosystem.
C
What tissue makes up most of the wood of a tree?
A) primary xylem
B) secondary xylem
C) secondary phloem
D) mesophyll cells
E) vascular cambium
B
If you were able to walk into an opening cut into the center of a large redwood tree, when you exit from the middle of the trunk (stem) outward, you would cross, in order,
A) the annual rings, new xylem, vascular cambium, phloem, and bark.
B) the secondary xylem, cork cambium, phloem, and periderm.
C) the vascular cambium, oldest xylem, and newest xylem.
D) the secondary xylem, secondary phloem, and vascular cambium.
E) the summer wood, bark, and phloem.
A
Additional vascular tissue produced as secondary growth in a root originates from which cells?
A) vascular cambium
B) apical meristem
C) endodermis
D) phloem
E) xylem
A
The polarity of a plant is established when
A) the zygote divides.
B) cotyledons form at the shoot end of the embryo.
C) the shoot-root axis is established in the embryo.
D) the primary root breaks through the seed coat.
E) the shoot first breaks through the soil into the light as the seed germinates.
A
Suppose George Washington completely removed the bark from around the base of a cherry tree but was stopped by his father before cutting the tree down. The leaves retained their normal appearance for several weeks, but the tree eventually died. The tissue(s) that George left functional was/were the
A) phloem.
B) xylem.
C) cork cambium.
D) cortex.
E) companion and sieve-tube members.
B
Most of the growth of a plant body is the result of
A) cell differentiation.
B) morphogenesis.
C) cell division.
D) cell elongation.
E) reproduction.
D
The innermost layer of the root cortex is the
A) core.
B) pericycle.
C) endodermis.
D) pith.
E) vascular cambium.
C
Heartwood and sapwood consist of
A) bark.
B) periderm.
C) secondary xylem.
D) secondary phloem.
E) cork.
C
Which of the following arise, directly or indirectly, from meristematic activity?
A) secondary xylem
B) leaves
C) dermal tissue
D) tubers
E) secondary xylem, leaves, dermal tissue, and tubers
E
Which of the following would not be seen in a cross-section through the woody part of a root?
A) sclerenchyma cells
B) parenchyma cells
C) sieve-tube elements
D) root hairs
E) vessel elements
D