Water Relations & Transpiration — Practice Questions
Free NEET Biology multiple-choice questions on Water Relations & Transpiration. Attempt each question and reveal the answer with a full explanation.
Potometer works on the principle of - Potential difference between the tip of the tube and that of the plant Amount of water absorbed equals the amount transpired Osmotic pressure Root pressure In Crassulacean Acid Metabolism (CAM) plants, CO 2 is initially fixed into Oxaloacetic acid (OAA) during the: Night by PEPcase Day by RuBisCO Night by RuBisCO Day by PEPcase Xerophytes like Opuntia have which of the following adaptations to reduce transpiration? Sunken stomata Thinner cuticles Larger leaf surface area High stomatal density Which of the following is considered the most ecologically relevant environmental factor? Temperature Water Light Soil Organisms that can tolerate only a narrow range of temperature fluctuations are referred to as: Stenothermal Eurythermal Stenohaline Euryhaline Organisms that can tolerate and thrive in a wide range of salinities are called: Euryhaline Stenohaline Eurythermal Stenothermal In the absence of an external source of water, the Kangaroo rat in North American deserts is capable of meeting all its water requirements through: Internal fat oxidation Drinking metabolic water from soil Consuming succulent leaves Storing water in specialized sacs Very small animals like shrews and hummingbirds are rarely found in polar regions because: They have a large surface area relative to their volume and lose body heat very fast. They have a small surface area relative to their volume and lose body heat slowly. They are unable to migrate to warmer regions during winter. They are ectotherms and cannot maintain a constant internal environment. Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will. no movement of water equilibrium between the two movement of water from cell A to B. movement of water from cell B to A. Which of the following criteria does not pertain to facilitated transport ? Requirement of special membrane proteins High selectivity Transport saturation Uphill transport Water vapour comes out from the plant leaf through the stomatal opening. Through the same stomatal opening carbon dioxide diffuses into the plant during photosynthesis. Reason out the above statements using one of following options :- (1) Both processes cannot happen simultaneously. (2) Both processes can happen together because the diffusion coefficient of water and CO2 is different. (3) The above processes happen only during night time. (4) One process occurs during day time, and the other at night. Guard cells help in : Fighting against infection Protection against grazing Transpiration Guttation The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is (1) Root pressure (2) Imbibition (3) Plasmolysis (4) Transpiration Match List-I with List-II. array ll List-I & List-II (a) Cohesion & (i) More attraction in liquid phase (b) Adhesion & (ii) Mutual attraction among water molecules (c) Surface tension & (iii) Water loss in liquid phase (d) Guttation & (iv) Attraction towards polar surfaces array Choose the correct answer from the options given below. (a) (iv), (b) (iii), (c) (ii), (d) (i) (a) (iii), (b) (i), (c) (iv), (d) (ii) (a) (ii), (b) (i), (c) (iv), (d) (iii) (a) (ii), (b) (iv), (c) (i), (d) (iii) Given below are two statements : Statement I : The forces generated transpiration can lift a xylem-sized column of water over 130 meters height. Statement II : Transpiration cools leaf surfaces sometimes 10 to 15 degrees evaporative cooling. In the light of the above statements, choose the most appropriate answer from the options given below : Both Statement I and Statement II are correct Both Statement I and Statement II are incorrect Statement I is correct but Statement II is incorrect Statement I is incorrect but Statement II is correct In roots absorption of water and minerals mostly occurs in the : (1) Root cap (2) Region of elongation (3) Region of maturation (4) Meristematic region Stomatal movement is not affected by O2 concentration Light Temperature CO2 concentration Xylem translocates Water, mineral salts, some organic nitrogen and hormones Water only Water and mineral salts only Water, mineral salts and some organic nitrogen only Which of the following is not observed during apoplastic pathway? The movement does not involve crossing of cell membrane The movement is aided by cytoplasmic streaming Apoplast is continuous and does not provide any barrier to water movement Movement of water occurs through intercellular spaces and wall of the cells Addition of more solutes in a given solution will : lower its water potential make its water potential zero not affect the water potential at all raise its water potential Match List I with List II : array ll List I & List II A. Cohesion & I. More attraction in liquid phase B. Adhesion & II. Mutual attraction among water molecules C. Surface tension & III. Water loss in liquid phase D. Guttation & IV. Attraction towards polar surfaces array Choose the correct answer from the options given below : A – II, B – IV, C – I, D – III A – IV, B – III, C – II, D – I A – III, B – I, C – IV, D – II A – II, B – I, C – IV, D – III During environmental stress like drought, Abscisic acid (ABA) promotes the closure of stomata by affecting the efflux of which ions from guard cells? K + ions Ca 2+ ions Cl - ions Na + ions