NEET Transpiration in Plants MCQs June 2018

1. Ringing/girdling experiments demonstrate
(a) phloem is responsible for translocation of food
(b) xylem is responsible for ascent of sap
(c) transpiration pull (d) both (a) and (b).

2. Which of the following theories gives the latest explanation for the opening and closure of stomata?
(a) Starch-sugar conversion theory
(b) Munch theory
(c) Transpiration pull theory
(d) Active K+ transport theory

3. Match column-I with column-II and select the correct option from the codes given below

5. The transpiration-driven ascent of xylem sap depends mainly upon_____ property of water.
(a) cohesion (b) adhesion
(c) surface tension (d) all of these

6. Which of the following is correct regarding the translocation of substances in vascular tissues of plants?
(a) Organic substances, e.g, sugars are transported upward in the xylem.
(b) Organic substances move up and down in phloem.
(c) Salts and other inorganic substances move downward only through the xylem.
(d) Inorganic substances move upward only through the pholem.

7. A girdled plant (upto bast) may survive for some time but it will eventually die, because
(a) water will not move downwards
(b) water will not move upwards
(c) sugars and other organic materials will not move downwards
(d) sugars and other organic materials will not move upwards.

8. Guttation is the release of liquid water from veins at the leaf margins. It is caused by
(a) transpiration
(b) high leaf pressure
(c) high root pressure
(d) clogged tracheids or vessel elements.

9. Wilting of a plant occurs when
(a) xylem is blocked
(b) phloem is blocked
(c) epidermis and few roots are removed
(d) pith is removed.

10. Translocation of minerals takes place through
(a) phloem (b) xylem
(c) cambium (d) wood parenchyma.

11. The continuity of water column in xylem is maintained due to
(a) adhesive property of water
(b) cohesive property of water
(c) presence of air bubbles
(d) both (a) and (b).

12. Stomata of a plant open when guard cells show
(a) influx of hydrogen ions
(b) efflux of potassium ions
(c) influx of potassium ions
(d) all of these.

13. Potometer works on the principle of
(a) osmotic pressure
(b) amount of water absorbed equals the amount transpired
(c) root pressure
(d) capillarity.

14. The rate of transpiration of a plant would gradually increase if
(a) the relative humidity increases
(b) the relative humidity decreases
(c) the relative humidity remains unchanged
(d) the water potential gradient remains unchanged.

15. The process of guttation takes place when
(a) the root pressure is high and the rate of transpiration is low
(b) the root pressure is low and the rate of transpiration is high
(c) the root pressure equals the rate of transpiration
(d) the root pressure as well as rate of transpiration are high.

16. Select the mismatched pair.
(a) Relay pump theory – Godlewski
(b) Pulsation theory – Sir J. C. Bose
(c) Transpiration pull theory – Dixon and Jolly
(d) Capillary force theory – Munch

17. Unidirectional flow of water, minerals, some organic nitrogen and hormones occurs through
(a) xylem (b) phloem
(c) root (d) vascular tissue.

18. Match column-I with column-II and select the correct option from the codes given below.

19. Loss of water in the form of vapours from the living tissues of aerial plant parts is called as
(a) transpiration (b) guttation
(c) bleeding (d) precipitation.

20. Rate of transpiration increases with an increase in
(a) temperature (b) light
(c) wind velocity (d) all of these.

Previous Exam Questions

1. The shade of a tree is cooler than the shade of a roof due to
(a) transpiration (b) guttation
(c) photosynthesis (d) green leaves.
(AIIMS 1995)

2. Transpiration can be influenced by interfering with
(a) osmotic pressure
(b) guard cell
(c) atmospheric temperature
(d) epidermis of leaf. (AFMC 1995)

3. Sir J.C. Bose proposed which of the following theories to explain the process of ascent of sap ?
(a) Pulsation theory
(b) Relay pump theory
(c) Transpiration pull theory
(d) Capillary force theory(Karnataka1996)

4. The plants face wilting due to use of excessive fertilizers, because of
(a) exosmosis (b) imbibition
(c) endosmosis (d) all of these. (UP-CPMT1998)

5. Opening and closing of stomata is due to the
(a) hormonal change in guard cells
(b) change in turgor pressure of guard cells
(c) gaseous exchange
(d) respiration. (CBSE-PMT2002)

6. “Transpiration is a necessary evil”, this statement belongs to
(a) Burgerstein (b) Reschke
(c) Curtis (d) Willmer. (Manipal 2002)

7. Opening or closing of stomata are under the control of
(a) K+ (b) P
(c) Mg (d) none of these.(DPMT2002)

8. Water lost by transpiration is
(a) rich in dissolved minerals
(b) rich in solutes
(c) pure water
(d) rich in dissolved salts (Karnataka 2002)

9. Guttation is loss of water
(a) in the form of vapour
(b) in the form of liquid droplets
(c) from root
(d) through stomata.(Manipal 2004)

10. Transpiration is very important for plants because it helps in
(a) the absorption of water from soil
(b) the cooling of leaves at high temperature
(c) the movement of water and minerals absorbed by roots to various parts of the plant
(d) all of the above. (AMU 2004)

11. The following figure shows the stomatal apparatus. Identify the parts labelled as A, B, C and D and choose the correct answer from the following.

(a) A = Guard cells, B = Stoma,
C = Chloroplasts, D = Subsidiary cells
(b) A = Subsidiary cells, B = Chloroplasts,
C = Stoma, D = Guard cells
(c) A = Guard cells, B = Chloroplasts,
C = Stoma, D = Subsidiary cells
(d) A = Subsidiary cells, B = Stoma,
C = Chloroplasts, D = Guard cells (Karnataka 2005)

12. In which of the following plants, there will be no transpiration?
(a) Aquatic, submerged plants
(b) Plants living in deserts
(c) Aquatic plants with floating leaves
(d) Plants growing in hilly regions (Karnataka 2005)

13. Upward movement of water in plants is called
(a) sucking (b) ascent of sap
(c) translocation (d) none of these. (Odisha 2006)

14. Sunken stomata are found in
(a) xerophytes (b) hydrophytes
(c) mesophytes (d) all of these. (Odisha 2006)

15. The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of
(a) weak gravitational pull
(b) transpiration pull
(c) lignified thick walls
(d) cohesion and adhesion. (CBSE-PMT2008)

16. Which of the following chemical serves as an antitranspirant in plants?
(a) Cobalt chloride
(b) Dimethyl mercury
(c) Potassium iodide
(d) Phenyl mercuric acetate (BHU 2008)

17. Which of the following does not cause opening of stomata?
(a) Light
(b) Increased pH
(c) Reduced pH
(d) Low CO2 concentration (DPMT2008)

18. Stomatal opening or closing is assisted by
(a) change in the turgidity of guard cells
(b) the inner walls of each guard cells which are thick and elastic
(c) cellulose microfibrils of guard cells, oriented radially
(d) all of the above. (AMU 2010)

19. Which of the following is not a purpose of transpiration?
(a) Transports minerals from the soil to all parts of the plant
(b) Helps in translocation of sugars from source to sink
(c) Maintains shape and structure of the plants
(d) Cools leaf surfaces (Kerala 2010)

20. In land plants, the guard cells differ from other epidermal cells in having
(a) cytoskeleton
(b) mitochondria
(c) endoplasmic reticulum
(d) chloroplasts. (AIPMT Prelims 2011)

21. Accumulation of which one of the following acids results into closure of stomata ?
(a) Malic acid
(b) Aspartic acid
(c) Phosphoenol pyruvic acid
(d) Oxaloacetic acid (AMU 2011)

22. Radial conduction of water takes place by
(a) vessels (b) vessels and trachieds
(c) phloem (d) ray parenchyma cells. (AMU 2012)

23. Force generated by transpiration can create pressure sufficient to lift water even upto the height of
(a) 130 feet (b) 130 metre
(c) 230 feet (d) 230 metre.(AMU 2012)

24. Stomata open at night in
(a) hydrophytes (b) succulents
(c) mesophytes (d) halophytes. (Odisha 2012)

25. Which of the following statements is not true for stomatal apparatus?
(a) Guard cells invariably possess chloroplasts and mitochondria.
(b) Guard cells are always surrounded by subsidiary cells.
(c) Stomata are involved in gaseous exchange.
(d) Inner wall of guard cells are thick. (NEET – Karnataka 2013)


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