1) all of the adhering to are tree adaptations to life top top land except A) tracheids and also vessels. B) source hairs. C) cuticle. D) the Calvin cycle of photosynthesis. E) collenchyma.

You are watching: Which of the following has the lowest (most negative) water potential?

2) The ancestors of soil plants were aquatic algae. I m sorry of the adhering to is not an evolution adaptation to life top top land? A) C₃ photosynthesis B) a waxy cuticle C) source hairs D) xylem and also phloem E) guard cells

3) most angiosperms have alternative phyllotaxy. What enables each leaf to acquire the preferably exposure come light and reduces shading of lower leaves? A) a sheet area index over 8 B) self-pruning C) one leaf just per node D) leaf appearance at an angle of 137.5°F native the website of previous pipeline E) a sheet area index above 8 and leaf appearance at an angle of 137.5°F from the website of vault leaves

4) A plant occurred a mineral deficiency after gift treated through a fungicide. What is the most probable reason of the deficiency? A) Mineral receptor protein in the plant membrane were not functioning. B) Mycorrhizal fungi to be killed. C) active transport of minerals was inhibited. D) The gene for the synthesis of deliver proteins to be destroyed. E) Proton pumps reversed the membrane potential.

5) If you were to prune the shoot advice of a plant, what would be the result on the plant and the sheet area index? A) bushier plants; lower leaf area table of contents B) tall plants; reduced leaf area index C) tall plants; higher leaf area index D) quick plants; lower leaf area index E) bushier plants; greater leaf area indexes

6) Which framework or compartment is not component of the plant\"s apoplast? A) the lumen that a xylem vessel B) the lumen the a sieve tube C) the cell wall surface of a mesophyll cell D) the cell wall surface of a move cell E) the cell wall surface of a root hair

7) i beg your pardon of the complying with would be least likely to affect osmosis in plants?A) proton pumps in the membrane B) a difference in solute concentrations C) receptor protein in the membrane D) aquaporins E) a distinction in water potential

8) energetic transport involves all of the following except the A) diffusion the solute with the lipid double layer of a membrane. B) pumping of solutes throughout the membrane. C) hydrolysis the ATP. D) transfer of solute versus a concentration gradient. E) specific transport protein in the membrane.

9) active transport of various materials in tree at the to move level requires all of the following except A) a proton gradient. B) ATP. C) membrane potential. D) transport proteins E) xylem membranes.

10) i m sorry of the adhering to is not a duty of the plasma membrane proton pump? A) hydrolyzes ATP B) produce a proton gradient C) generates a membrane potential D) equalizes the charge on every side that a membrane E) stores potential power on one next of a membrane

11) provided that at an early stage land tree most likely share a typical ancestor with environment-friendly algae, the earliest floor plants to be most most likely A) nonvascular tree that prospered leafless photosynthetic shoots over the shallow new water in which castle lived. B) species that did not exhibit alternation that generations. C) vascular plants through well-defined source systems. D) plants with well-developed leaves. E) varieties with a well-developed, thick cuticle.

12) The activity of water across biological membranes can ideal be suspect by A) negative charges in the cabinet wall. B) prevailing weather conditions. C) aquaporins. D) level of energetic transport. E) water potential.

13) An open beaker the pure water has a water potential (Ψ) that A) -0.23 MPa. B) +0.23 MPa. C) +0.07 MPa. D) -0.0000001 MPa. E) 0.0 (zero).

14) all of the following have an result on water potential (Ψ) in plants other than A) physics pressure. B) water-attracting matrices. C) liquified solutes. D) osmosis. E) DNA structure.

15) If ΨP = 0.3 MPa and ΨS = -0.45 MPa, the resulting Ψ is A) +0.75 MPa. B) -0.75 MPa. C) -0.15 MPa. D) +0.15 MPa. E) -0.42 MPa.

16) The worth for Ψ in root organization was found to it is in -0.15 MPa. If you take it the source tissue and also place it in a 0.1 M equipment of sucrose (Ψ = -0.23 MPa), the net water flow would A) it is in from the tissue right into the sucrose solution. B) be from the sucrose solution right into the tissue. C) be in both directions and also the concentrations would remain equal. D) take place only as ATP to be hydrolyzed in the tissue. E) be impossible to recognize from the values given here.

17) compared to a cell with couple of aquaporins in that is membrane, a cabinet containing numerous aquaporins will A) have a faster rate of osmosis. B) have actually a reduced water potential. C) have a greater water potential. D) have a much faster rate of active transport. E) be flaccid.

18) some botanists argue the the entire plant should be thought about as a solitary unit rather than a composite of countless individual cells. I beg your pardon of the complying with cellular structures cannot be provided to support this view? A) cell wall B) cabinet membrane C) cytosol D) tonoplast E) symplast

19) i m sorry of the following statements is false around bulk flow? A) the is driven mainly by push potential. B) that is an ext effective 보다 diffusion over distances greater 보다 100 μm. C) It relies on a difference in push potential in ~ the resource and sink. D) It relies on the pressure of gravity on a pillar of water. E) It may be the an outcome of either confident or negative pressure potential.

20) which of the adhering to would likely not contribute to the surface area accessible for water absorption from the soil by a plant root system? A) root hairs B) endodermis C) mycorrhizae D) fungi associated with the roots E) fibrous arrangement of the roots

21) root hairs room most vital to a plant due to the fact that they A) anchor a tree in the soil. B) store starches. C) boost the surface area because that absorption. D) provide a habitat because that nitrogen-fixing bacteria. E) save xylem tissue.

22) A water molecule could move all the means through a tree from floor to root to sheet to air and also pass v a life cell just once. This life cell would certainly be a part of which structure? A) the Casparian strip B) a guard cell C) the root epidermis D) the endodermis E) the source cortex

23) every one of the following involve energetic transport throughout membranes other than A) the activity of mineral nutrients from the apoplast come the symplast. B) the movement of sugar from mesophyll cells into sieve-tube elements. C) the movement of sugar from one sieve-tube aspect to the next. D) the motion of K+ across guard cabinet membranes throughout stomatal opening. E) the motion of mineral nutrients right into cells of the root cortex.

24) which of the complying with statements around xylem is incorrect? A) it conducts material from root tips to leaves. B) The conducting cells are component of the apoplast. C) it transports greatly sugars and amino acids. D) It generally has a reduced water potential 보다 is found in soil. E) No power input is compelled for transport.

25) What is the duty of proton pumps in source hair cells? A) establish ATP gradients B) maintain the H+ gradient C) pressurize xylem transfer D) get rid of excess electron E) aid in energetic uptake that water molecules

26) In plant roots, the Casparian strip is properly described whereby of the following? A) it aids in the uptake of nutrients. B) the provides energy for the active transport of minerals right into the stele indigenous the cortex. C) that ensures the all mineral are absorbed from the floor in equal amounts. D) it ensures the all water and also dissolved substances must pass v a cell membrane before entering the stele. E) It gives increased surface area because that the absorption of mineral nutrients.

27) i beg your pardon of the adhering to is not an important component of the long-distance transport procedure in plants? A) the cohesion that water molecules B) a negative water potential C) the root parenchyma D) the energetic transport the solutes E) mass flow from source to sink

28) pine seedlings get an impression in sterile potting soil flourish much slower 보다 seedlings get an impression in soil from the area where the seeds were collected. This is many likely because A) the sterilization procedure kills the source hairs as they arise from the seedling. B) the regular symbiotic fungi are not present in the sterilized soil. C) sterilization gets rid of essential nutrients from the soil. D) water and also mineral absorb is quicker when mycorrhizae space present. E) B and D.

29) The following components may occasionally play a duty in the activity of sap with xylem. I beg your pardon one depends on the direct expenditure the ATP by the plant? A) capillarity that water in ~ the xylem B) evaporation of water from pipeline C) cohesion among water molecule D) concentration of ions in the symplast E) mass flow of water in the source apoplast

30) One is most likely to check out guttation in small plants as soon as the A) transpiration prices are high. B) root press exceeds transpiration pull. C) coming before evening was hot, windy, and also dry. D) water potential in the stele the the source is high. E) roots space not absorbing minerals from the soil.

31) One would suppose to uncover the highest density of aquaporins in i beg your pardon of the following? A) the plasma membrane the guard cells B) the pits the a tracheid C) the plasma membrane of parenchyma cells in a ripe fruit D) the plasma membrane the a tires mesophyll cell in a leaf E) the membrane lining plasmodesmata

32) If isolated plant cells v a water potential averaging -0.5 MPa are placed into a systems with a water potential of -0.3 MPa, i beg your pardon of the following would be the most likely outcome? A) The push potential the the cells would certainly increase. B) Water would move out the the cells. C) The cell walls would rupture, killing the cells. D) Solutes would relocate out that the cells. E) The osmotic pressure of the cells would decrease.

33) What cd driver the circulation of water v the xylem? A) passive transfer by the endodermis B) the variety of companion cell in the phloem C) the evaporation of water from the leaves D) active transport by sieve-tube facets E) energetic transport by tracheid and also vessel elements

34) What is the main force by which most that the water within xylem vessels moves toward the optimal of a tree? A) active transport that ions into the stele B) atmospheric push on roots C) evaporation of water through stoma D) the force of root press E) osmosis in the root

35) In which plant cabinet or tissue would the push component that water potential most regularly be negative? A) sheet mesophyll cabinet B) stem xylem C) stem phloem D) root cortex cell E) source epidermis

36) Water potential is generally most an unfavorable in i m sorry of the complying with parts of a plant? A) mesophyll cell of the sheet B) xylem ship in leaves C) xylem vessels in root D) cells of the source cortex E) source hairs

37) which of the following has the shortest (most negative) water potential? A) root cortical cell B) root xylem C) tribe xylem D) sheet cell wall surfaces E) leaf air spaces

38) which of the following is responsible for the cohesion the water molecules? A) hydrogen bonds in between the oxygen atom of a water molecule and also cellulose in a vessel cabinet B) covalent bonds between the hydrogen atoms of two adjacent water molecules C) hydrogen bonds between the oxygen atom that one water molecule and a hydrogen atom of one more water molecule D) covalent bonds in between the oxygen atom of one water molecule and also a hydrogen atom of an additional water molecule E) low concentrations of charged solutes in the fluid

39) Transpiration in tree requires every one of the following except A) adhesion of water molecules to cellulose. B) cohesion between water molecules. C) evaporation the water molecules. D) energetic transport with xylem cells. E) transport v tracheids.

40) which of the adhering to statements about transport in tree is false? A) Weak bonding between water molecules and the wall surfaces of xylem ship or tracheids helps support the columns of water in the xylem. B) Hydrogen bonding between water molecules, which outcomes in the high cohesion that the water, is crucial for the increase of water in tall trees. C) Although some angiosperm plants construct considerable source pressure, this is not adequate to progressive water to the top of tall trees. D) many plant physiologists currently agree the the traction from the optimal of the plant resulting native transpiration is sufficient, when merged with the cohesion the water, to describe the rise of water in the xylem in even the tallest trees. E) Gymnosperms have the right to sometimes develop especially high source pressure, which may account because that the climb of water in high pine tree without transpiration pull.

41) active transport would be least essential in the common functioning of which of the complying with plant tissue types? A) leaf transport cells B) stem tracheary facets C) root endodermal cell D) sheet mesophyll cells E) root sieve-tube elements

42) which of the adhering to statements is false concerning the xylem? A) Xylem tracheids and vessels fulfill their an important function only after your death. B) The cell wall surfaces of the tracheids are substantially strengthened v cellulose fibrils developing thickened ring or spirals. C) Water molecules room transpired indigenous the cells of the leaves, and replaced through water molecules in the xylem pulled up native the roots because of the cohesion of water molecules. D) motion of products is by mass flow; solutes in xylary sap move because of a optimistic turgor press gradient from resource to sink. E) In the morning, sap in the xylem starts to move very first in the twigs of the upper part of the tree, and also later in the lower trunk.

43) Xylem vessels, uncovered in angiosperms, have actually a much better internal diameter than tracheids, the just xylem-conducting cells discovered in gymnosperms. The tallest life trees, redwoods, are gymnosperms. Which of the following is an advantage of tracheids over vessels for long-distance transfer to good heights? A) Adhesive pressures are proportionally greater in narrower cylinders than in broader cylinders. B) The smaller the diameter of the xylem, the much more likely cavitation will certainly occur. C) Cohesive forces are higher in small tubes 보다 in vast tubes that the exact same height. D) Adhesive pressures are proportionally greater in narrower cylinders 보다 in wider cylinders, and also cohesive forces are higher in small tubes than in wide tubes of the exact same height. E) Adhesive pressures are proportionally higher in narrow cylinders than in wider cylinders, and the smaller sized the diameter of the xylem, the more likely cavitation will certainly occur.

44) Water rises in plants generally by cohesion-tension. I beg your pardon of the following is no true about the cohesion-tension model? A) Water ns (transpiration) is the driving pressure for water movement. B) The \"tension\" of this model represents the excitability of the xylem cells. C) Cohesion represents the propensity for water molecules to stick together by hydrogen bonds. D) The physical pressures in the capillary-sized xylem cells do it simpler to conquer gravity. E) The water potential of the air is more negative than the xylem.

45) Assume the a details chemical interferes through the establishment and also maintenance of proton gradients across the membrane of tree cells. Every one of the following processes would be directly impacted by this chemical other than A) photosynthesis. B) phloem loading. C) xylem transport. D) cellular respiration. E) stomatal opening.

46) Which cell in a root form a protective obstacle to the vascular device where all products must move through the symplast? A) pericycle B) cortex C) epidermis D) endodermis E) exodermis

47) guard cells perform which of the following? A) protect the endodermis B) accumulate K+ and also close the stomata C) save on computer chloroplasts that income K+ directly into the cells D) guard versus mineral loss through the stomata E) assist balance the photosynthesis-transpiration compromise

48) all of the complying with normally go into the plant with the roots other than A) carbon dioxide. B) nitrogen. C) potassium. D) water. E) calcium.

49) Photosynthesis starts to decrease when pipeline wilt due to the fact that A) chloroplasts in ~ wilted leaves space incapable that photosynthesis. B) CO2 accumulates in the leaves and also inhibits the enzymes essential for photosynthesis. C) over there is inadequate water because that photolysis throughout the light reactions. D) stomata close, restricting CO₂ entry into the leaf. E) wilted leaves cannot absorb the red and blue wavelength of light.

50) The water lost during transpiration is a side impact of the plant\"s exchange of gases. However, the plant derives some advantage from this water lose in the kind of A) evaporative cooling. B) mineral transport. C) enhanced turgor. D) boosted growth, E) only evaporative cooling and mineral transport.

51) ignoring all other factors, what type of job would an outcome in the fastest delivery of water and also minerals to the pipeline of a tree? A) cool, dry day B) warm, dried day C) warm, humid work D) cool, humid day E) really hot, dry, windy day

52) If the safety cells and also surrounding epidermal cell in a plant room deficient in potassium ions, all of the following would occur other than A) photosynthesis would decrease. B) roots would certainly take up less water. C) phloem transport rates would decrease. D) sheet temperatures would certainly decrease. E) stomata would be closed.

53) The opening of stomata is believed to show off A) rise in the solute concentration of the guard cells. B) a to decrease in the solute concentration of the stoma. C) active transport the water the end of the guard cells. D) lessened turgor pressure in safety cells. E) motion of K+ indigenous the security cells.

54) which of the following speculative procedures would certainly most likely reduce transpiration while allowing the normal expansion of a plant?A) subjecting the pipeline of the plant to a partial vacuum B) increasing the level the carbon dioxide around the plant C) placing the plant in drier soil D) diminish the relative humidity roughly the tree E) injecting potassium ions into the guard cells of the plant

55) guard cells are the just cells in the epidermis that contain chloroplasts and can experience photosynthesis. This is important since A) chloroplasts sense when light is easily accessible so the guard cells will certainly open.B) photosynthesis gives the energy necessary for contractile proteins to flex and open the guard cells. C) guard cells will produce the O₂ essential to power active transport. D) ATP is required to power proton pumps in the guard cell membranes. E) chloroplast sense when light is obtainable so that guard cells will certainly open and guard cell will create the O₂ necessary to power active transport.

56) all of the complying with are adaptations that assist reduce water loss from a plant other than A) transpiration. B) sunken stomata. C) C4 photosynthesis. D) small, special leaves. E) crassulacean mountain metabolism.

57) i beg your pardon of the following finest explains why very couple of CAM plants room tall? A) they have difficulty moving water and minerals to the peak of the plant during the day. B) They would be unable to supply enough sucrose for active transport the minerals right into the roots throughout the work or night. C) Transpiration occurs only at night, and this would cause a highly negative Ψ in the root of a high plant during the day. D) since the stomata are closed in the leaves, the Casparian piece is closeup of the door in the endodermis that the root. E) v the stomata open up at night, the transpiration rate would border plant height.

58) together a biologist, that is your job to look because that plants the have progressed structures through a selective advantage in dry, warm conditions. Which of the complying with adaptations would certainly be the very least likely to meet your objective? A) cam plants that thrive rapidly B) small, special leaves with stomata top top the reduced surface C) a thick cuticle ~ above fleshy leaves D) large, fleshy stems v the capability to bring out photosynthesis E) plants that carry out not develop abscisic acid and also have a short, special taproot

59) A primary an outcome for stomatal closure on a hot, dried day would certainly be A) relax of K+ ions to the apoplast and subsidiary cells. B) displacement the Ca++ ions from the special inner wall surfaces of the security cells.C) disassembly the the microfibrils in the cell walls of the subsidiary cells. D) upregulation the aquaporin synthesis. E) downregulation of extension proteins.

60) What is the driving pressure for the movement of solutes in the phloem of plants? A) heaviness B) a distinction in water potential (Ψ) in between the resource and the sink C) root press D) transpiration the water v the stomata E) adhesion that water to phloem sieve tubes

61) Phloem move of sucrose is often explained as walk from source to sink. I m sorry of the complying with would not normally duty as a sink? A) farming leaf B) growing root C) storage organ in summer D) mature leaf E) shooting tip

62) which of the following is a exactly statement around sugar movement in phloem? A) Diffusion have the right to account for the observed prices of transport. B) movement can happen both upward and also downward in the plant. C) sugar is translocated from sink to sources. D) just phloem cells v nuclei can perform sugar movement. E) Sugar transfer does not need energy.

63) Phloem move is described as gift from source to sink. Which of the following would most accurately finish this statement about phloem move as used to many plants in the so late spring? Phloem transports ________ native the ________ source to the ________ sink. A) amino acids; root; mycorrhizae B) sugars; leaf; apical meristem C) main point acids; flower; source D) proteins; root; leaf E) sugars; stem; root

64) species the adhering to five occasions in an stimulate that explains the mass circulation of products in the phloem. 1. Water diffuses into the sieve tubes. 2. Sheet cells develop sugar through photosynthesis. 3. Solutes are proactively transported into sieve tubes. 4. Sugar is transported from cabinet to cell in the leaf. 5. Street moves down the stem. A) 2, 1, 4, 3, 5 B) 1, 2, 3, 4, 5 C) 2, 4, 3, 1, 5 D) 4, 2, 1, 3, 5 E) 2, 4, 1, 3, 5

65) Water flows into the source end of a sieve tube since A) sucrose has diffused into the sieve tube, making it hypertonic. B) sucrose has actually been proactively transported into the sieve tube, making the hypertonic. C) water pressure external the sieve tube pressures in water. D) the companion cell of a sieve tube proactively pumps in water. E) sucrose has actually been transported out of the sieve tube by energetic transport.

66) Which among the adhering to statements about transport of nutrient in phloem is false? A) Solute particles can be proactively transported into phloem in ~ the source.B) Companion cells control the rate and direction of movement of phloem sap. C) distinctions in osmotic concentration in ~ the resource and sink reason a hydrostatic press gradient to be formed. D) A sink is that part of the plant where a details solute is consumed or stored. E) A sink might be located anywhere in the plant.

67) according to the pressure flow hypothesis the phloem transport, A) solute moves from a high concentration in the source to a reduced concentration in the sink. B) water is proactively transported into the source region of the phloem to produce the turgor pressure needed. C) the mix of a high turgor press in the source and transpiration water loss native the sink moves solutes v phloem conduits. D) the formation of starch from street in the sink rises the osmotic concentration. E) the pressure in the phloem that a source is generally greater 보다 the pressure in the phloem of a leaf.

68) Plants do not have actually a circulatory device like the of some animals. If a water molecule go \"circulate\" (that is, go from one point in a tree to another and back in the exact same day), it would require the task of A) just the xylem. B) only the phloem. C) only the endodermis. D) both the xylem and the endodermis. E) both the xylem and the phloem.

69) Long-distance electric signaling in the phloem has been displayed to elicit a readjust in all of the following except A) rapid leaf movement. B) gene transcription. C) a move from C4 to C3 photosynthesis. D) gene transcription. E) phloem unloading.

70) Plasmodesmata can adjust in number, and when dilated can provide a passageway because that A) macromolecules such as RNA and also proteins. B) ribosomes. C) chloroplasts. D) mitochondria. E) cytoskeletal components.


The adhering to photo reflects a strawberry sheet displaying guttation. Prize the complying with question about guttation. 71) What is the main reason of guttation in plants? A) root push B) transpiration C) pressure circulation in phloem D) plant injury E) condensation that atmospheric water

72) A other student lugged in a sheet to it is in examined. The sheet was dark green, thin, had stoma ~ above the lower surface only, and had a total surface area of 10 square meters. Where is the many likely environment where this sheet was growing? A) a dry, sandy an ar B) a large, quiet pond C) a tropic rain forest D) one oasis in ~ a meadow E) the floor of a deciduous forest

73) several tomato plants are cultivation in a small garden plot. If soil water potential were to drop considerably on a hot summer afternoon, i m sorry of the adhering to would most most likely occur? A) Stomatal apertures would certainly decrease. B) Transpiration would certainly increase. C) The leaves would become much more turgid. D) The absorb of CO2 would certainly be enhanced. E) The proton gradient would dissipate.

74) The symplast transports all of the following other than A) sugars. B) mRNA. C) DNA. D) proteins. E) viruses.

75) i m sorry of the adhering to is one adaptation that improves the uptake of water and also minerals by roots? A) mycorrhizae B) cavitation C) energetic uptake by vessel facets D) rhythmic contractions through cortical cell E) pumping with plasmodesmata

76) Which framework or compartment is component of the symplast? A) the internal of a vessel element B) the inner of a sieve pipe C) the cell wall of a mesophyll cell D) one extracellular air room E) the cell wall surface of a source hair

77) motion of phloem sap native a resource to a sink A) occurs through the apoplast the sieve-tube elements. B) depends at some point on the activity of proton pumps. C) counts on tension, or an adverse pressure potential. D) relies on pumping water into sieve tubes in ~ the source. E) results greatly from diffusion.

78) Photosynthesis ceases once leaves wilt, mainly due to the fact that A) the chlorophyll in wilting leaves is degraded. B) flaccid mesophyll cells are incapable the photosynthesis. C) stomata close, preventing CO₂ indigenous entering the leaf. D) photolysis, the water-splitting action of photosynthesis, cannot take place when over there is a water deficiency. E) build-up of CO₂ in the leaf inhibits enzymes.

79) What would enhance water uptake by a plant cell? A) to decrease the Ψ the the surrounding solution B) increasing the push exerted by the cell wall surface C) the lose of solutes native the cell D) boosting the Ψ of the cytoplasm E) optimistic pressure ~ above the surrounding solution

80) A plant cell v a ΨS the -0.65 MPa maintains a constant volume when bathed in a solution that has actually a ΨS that -0.30 MPa and is in an open up container. The cell has actually a A) ΨP of +0.65 MPa. B) Ψ that -0.65 MPa. C) ΨP that +0.35 MPa. D) ΨP the +0.30 MPa. E) Ψ of 0 MPa.

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81) contrasted with a cell with few aquaporins in that membrane, a cell containing numerous aquaporins will certainly A) have actually a much faster rate of osmosis. B) have a reduced water potential. C) have a greater water potential. D) have actually a faster rate of active transport. E) accumulate water by active transport.

82) i beg your pardon of the complying with would often tend to boost transpiration? A) a rainstorm B) sunken stomata C) a more thickness cuticle D) greater stomatal density E) spiny leaves