Basic Biology Practice Test: Resource Acquisition and Transport in Vascular Plants | Practice Test / Quiz / MCQs

2. In plant roots, the Casparian strip is correctly described by which of the following?

It ensures that all minerals are absorbed from the soil in equal amounts.It ensures that all water and dissolved substances must pass through a cell membrane before entering the stele.It provides energy for the active transport of minerals into the stele from the cortex.It provides increased surface area for the absorption of mineral nutrients.It aids in the uptake of nutrients.

3. Guard cells do which of the following?

contain chloroplasts that import K+ directly into the cellsaccumulate K+ and close the stomataprotect the endodermisguard against mineral loss through the stomatahelp balance the photosynthesis-transpiration compromise

4. Most angiosperms have alternate phyllotaxy. What allows each leaf to get the maximum exposure to light and reduces shading of lower leaves?

self-pruningone leaf only per nodeleaf emergence at an angle of 137.5°F from the site of previous leavesa leaf area index above 8a leaf area index above 8 and leaf emergence at an angle of 137.5°F from the site of previous leaves

5. Photosynthesis ceases when leaves wilt, mainly because

accumulation of CO2 in the leaf inhibits enzymes.stomata close, preventing CO2 from entering the leaf.photolysis, the water-splitting step of photosynthesis, cannot occur when there is a water deficiency.flaccid mesophyll cells are incapable of photosynthesis.the chlorophyll in wilting leaves is degraded.

6. Compared to a cell with few aquaporins in its membrane, a cell containing many aquaporins will

be flaccid.have a faster rate of osmosis.have a lower water potential.have a higher water potential.have a faster rate of active transport.

8. Which of the following statements is false about bulk flow?

It depends on the force of gravity on a column of water.It may be the result of either positive or negative pressure potential.It is driven primarily by pressure potential.It is more effective than diffusion over distances greater than 100 μm.It depends on a difference in pressure potential at the source and sink.

9. Transpiration in plants requires all of the following except

active transport through xylem cells.adhesion of water molecules to cellulose.cohesion between water molecules.transport through tracheids.evaporation of water molecules.

10. Photosynthesis begins to decline when leaves wilt because

there is insufficient water for photolysis during the light reactions.chloroplasts within wilted leaves are incapable of photosynthesis.stomata close, restricting CO2 entry into the leaf.CO2 accumulates in the leaves and inhibits the enzymes needed for photosynthesis.wilted leaves cannot absorb the red and blue wavelengths of light.

11. One is most likely to see guttation in small plants when the

roots are not absorbing minerals from the soil.transpiration rates are high.water potential in the stele of the root is high.preceding evening was hot, windy, and dry.root pressure exceeds transpiration pull.

13. Which of the following experimental procedures would most likely reduce transpiration while allowing the normal growth of a plant?

decreasing the relative humidity around the plantincreasing the level of carbon dioxide around the plantinjecting potassium ions into the guard cells of the plantsubjecting the leaves of the plant to a partial vacuumputting the plant in drier soil

14. What would enhance water uptake by a plant cell?

increasing the pressure exerted by the cell wallthe loss of solutes from the cellincreasing the Ψ of the cytoplasmpositive pressure on the surrounding solutiondecreasing the Ψ of the surrounding solution

15. In which plant cell or tissue would the pressure component of water potential most often be negative?

leaf mesophyll cellstem phloemroot cortex cellstem xylemroot epidermis

16. Root hairs are most important to a plant because they

provide a habitat for nitrogen-fixing bacteria.increase the surface area for absorption.anchor a plant in the soil.store starches.contain xylem tissue.

17. What is the role of proton pumps in root hair cells?

pressurize xylem transportestablish ATP gradientsmaintain the H+ gradientassist in active uptake of water moleculeseliminate excess electrons

18. If you were to prune the shoot tips of a plant, what would be the effect on the plant and the leaf area index?

bushier plants; higher leaf area indexesbushier plants; lower leaf area indextall plants; higher leaf area indextall plants; lower leaf area indexshort plants; lower leaf area index

19. Which of the following is an adaptation that enhances the uptake of water and minerals by roots?

rhythmic contractions by cortical cellscavitationactive uptake by vessel elementsmycorrhizaepumping through plasmodesmata

20. Guard cells are the only cells in the epidermis that contain chloroplasts and can undergo photosynthesis. This is important because

photosynthesis provides the energy necessary for contractile proteins to flex and open the guard cells.ATP is required to power proton pumps in the guard cell membranes.chloroplasts sense when light is available so that guard cells will open and guard cells will produce the O2 necessary to power active transport.chloroplasts sense when light is available so that guard cells will open.guard cells will produce the O2 necessary to power active transport.

21. Which of the following would be least likely to affect osmosis in plants?

proton pumps in the membranea difference in water potentialaquaporinsa difference in solute concentrationsreceptor proteins in the membrane

22. Active transport of various materials in plants at the cellular level requires all of the following except

xylem membranes.transport proteinsATP.a proton gradient.membrane potential.

23. Which of the following statements about transport in plants is false?

Hydrogen bonding between water molecules, which results in the high cohesion of the water, is essential for the rise of water in tall trees.Weak bonding between water molecules and the walls of xylem vessels or tracheids helps support the columns of water in the xylem.Gymnosperms can sometimes develop especially high root pressure, which may account for the rise of water in tall pine trees without transpiration pull.Although some angiosperm plants develop considerable root pressure, this is not sufficient to raise water to the tops of tall trees.Most plant physiologists now agree that the pull from the top of the plant resulting from transpiration is sufficient, when combined with the cohesion of water, to explain the rise of water in the xylem in even the tallest trees.

24. A plant cell with a ΨS of -0.65 MPa maintains a constant volume when bathed in a solution that has a ΨS of -0.30 MPa and is in an open container. The cell has a

Ψ of 0 MPa.Ψ of -0.65 MPa.ΨP of +0.30 MPa.ΨP of +0.35 MPa.ΨP of +0.65 MPa.

25 Questions

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25 Questions

❤ If you liked Fatskills, consider supporting us by checking out The Life Manuals You Never Got.

About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | OSHA Basics Quiz | What Should We Know? Privacy | Terms |

Without work one finishes nothing. - Ralph Waldo Emerson© 2026 Fatskills.com

All trademarks, logos and brand names are the property of their respective owners. All company, product and service names used in this website are for identification purposes only. Use of these names, trademarks and brands does not imply endorsement.

About | Explore | User Guide | Topics | Subjects | Doubt Solver | Career Aptitude Test | Answers | Free Tools | OSHA Basics Quiz | What Should We Know?
Privacy | Terms |

Without work one finishes nothing. - Ralph Waldo Emerson
© 2026 Fatskills.com