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9.1 and 9.2 Quiz (structure and function of plants)
Name ________________________
1) What mechanisms do plants use to load sucrose
produced by photosynthesis into
specialized cells in the veins of leaves?
A) an electrogenic pump
B) a proton pump
C) a contransport protein
D) A and C only
E) A, B, and C
2) You are studying a plant from the arid southwestern
United States. Which of the following
adaptations is least likely to have evolved in response to
water shortages?
A) closing the stomata during the hottest time of the
day
B) development of large leaf surfaces to absorb water
C) formation of a fibrous root system spread over a
large area
D) mycorrhizae associated with the root system
E) a thick waxy cuticle on the epidermis
3) Which part of a plant absorbs most of the water and
minerals taken up from the soil?
A) taproots
B) root hairs
C) the thick parts of the roots near the base of the stem
D) storage roots
E) sections of the root that have secondary xylem
4) Which cells are no longer capable of carrying out the
process of DNA transcription?
A) xylem
B) sieve tube elements
C) companion cells
D) A and B only
E) A, B and C
5) __________ is to xylem as __________ is to phloem.
A) Sclerenchyma cell; parenchyma cell
B) Apical meristem; vascular cambium
C) Vessel element; sieve-tube member
D) Cortex; pith
E) Vascular cambium; cork cambium
6) CO2 enters the inner the inner spaces of the leaf
through the
A) cuticle.
B) epidermal trichomes.
C) stoma.
D) phloem.
E) walls of guard cells.
7) Which of the following are the water-conducting cells
of xylem, have thick walls, and are dead at functional
maturity?
A) parenchyma cells
B) collenchyma cells
C) clerenchyma cells
D) tracheids and vessel elements
E) sieve-tube elements
8) 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) the cells of roots have cell walls and leaf cells do not.
C) a waxy cuticle covers leaves but is absent in roots.
D) vascular tissue is found in roots but is absent from
leaves.
E) leaves have epidermal tissue but roots do not.
9) Gas exchange, 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
10) 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
Outline the role of the phloem in the active translocation of biochemicals. (5 marks)
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living tissue
composed of companion cells / sieve tube members
companion cells involved in ATP production
sucrose / amino acids / assimilate / products of photosynthesis transported
bi-directional transport
source / leaves to sink / fruits / roots /storage organs / named storage organ
pressure flow hypothesis / movement of water into phloem causes transport