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<>Multiple Choice Questions (MCQs), , (A) NAME THE FOLLOWING BY CHOOSING THE CORRECT OPTION :, , separating membrane, (2) Osmosis (b) Diffusion, (© Active transport (@) Capillarity, Q2 The condition of a cell placed in a hypotonic solution,, (0) Turgidity () Flaccidity, (©) Plasmolysis (4) None of these, Q3. Process by which intact plants lose water in the form of droplets from leaf margins,, (2) Adhesion (®) Imbibition, (©) Guttation (d) Diffusion, QA. Process by which water enters root hairs., (2) Ascent of sap (6) Descent of sap, (©) Bleeding (@)Endosmosis, Q5. The tissue concerned with upward conduction of water in plants., (@) Xylem (b) Phicem, (© Both (@) None of these, Q6. The pressure which is responsible for the movement of water molecules across the cortical, root., (2) Suction pressure (®) Root pressure, (©) Osmotic pressure (4) Cohesive pressure, Q7. A biological membrane that acts as a selectively permeable membrane, (a) Tonoplast (6) Muslin cloth, __ © Visking bag (4 Goats bladder, Qs. Phenomenon by which living or dead plant cells absorb water by surface attraction, (a) Guttation i. (6) Imbibition, (0) Plasmolysis "> (@) Osmosis

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Q.9. The water that is available to the plants, , (a) runoff water (0) gravitational water, (co) hygroscopic water (d@) capillary water, Q.10, The process in which water is lost from the margins of strawberry leaves, (a) Osmosis (6) Imbibition, (0) Diffusion (d) Guttation, Q.11. The component that is essential to perform all physiological activities of the plant, (a) Pressure (b) Water, (c) Temperature (d) All of the above, Q.12. The form of sugar transported through the phloem is, (a) Sucrose (b) Fructose, (© Ribose (d) Glucose, , (B) CHOOSE THE CORRECT ANSWER FROM EACH OF THE FOUR OPTIONS GIVEN BELOW:, Q.13. Stomata close down if relative humidity of atmosphere falls below, , (a) 50% (b) 70%, (2) 80% (d) 60%, Q.14, Cohesion-tension theory is related to, (a) Transpiration (b) Respiration, (© Ascent of sap (@) Photosynthesis, Q.15. Root cap has no role in absorption because it has, (a) no direct connection with vascular system (b) loosely arranged cells, (0) no cells containing chloroplasts (@) no root hairs, Q.16. Wilting of the plant occurs when, () phloem is blocked (®) xylem is blocked, , (o) both xylem and phloem are blocked —_—(d) a few old roots are removed, Q.17. Which of the following is a rapid type of absorption?, , (a) passive absorption (b) active absorption ., , (©) root absorption (d) salt absorption, Q.18. Transport of water in tall trees appears to be mainly due to, , (a) metabolic activity in xylem cells (6) root pressure, , (c) capillary rise in xylem open pipes (d) transpiration pull and cohesion of water molecules, Q.19. In active absorption of water ., , (a) energy is not used, (b) the transpiration pull provides force for absorbing water, (6) the root respiration gives energy, (d) the photosynthesis provides energy, Q.20. Which of the following has highest water potential?, (a) Sugar solution (b) Distilled water, , (c) Pond water (@) Tap water

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aan, , Q21. The process by which water enters the roots due to diffusion is termed as, (a) endocytosis (6) active absorption, , (© osmosis (d) passive absorption, Q.22. Root pressure is maximum when, , (@) transpiration is very high and absorption is very low, (0) transpiration is very low and absorption is very high, (¢) both transpiration and absorption are very high, (@) both the absorption and transpiration are very low, | Q23. Passive absorption of water from the soil by root hair is mainly affected by, | (@) respiratory activity of root, (6) typical tissue organisation of root, : (© tension on the cell sap due to transpiration, (d) root pressure developed in the cortical cells of the roots, Q24. Water potential of the root hair cells is, | (@) equal to soil water, q (b) more negative than that of soil water, (c) more positive in comparison to soil water, , Hj (d) none of the above, sy Q25. Water will be absorbed by the root hairs when the external medium is, (a) isotonic (b) hypertonic, | (0) hypotonic (@ viscous, | Q.26. Which of the following plants absorb water from the air?, (a) Orchids () Ficus, (©) Cuseuta (@ Brassica, , Q27. Active absorption of water by roots from the soil is mainly affected by, (2) osmotic concentration of cell sap (b) tension in cell sap due to transpiration, , (¢) sucking power of the root hairs (d) typical tissue organisation, Q28. Absorption of water through roots can be increased by, , (2) increased transpiration (b) increased rate of photosynthesis, , (c) decreased transpiration (d) decreased absorption of ions, Q.29. When the concentration of soil solutes is low, the absorption of water, , (e) retards (b) increases, , (¢) remains same (d) stops completely, Q.30. In roots, root hairs occur in the zone of, , (a) cell division (0) cell elongation, , (¢) cell maturation (@) none of the above, , Q31. Which of the following statements is correct?, (2) carbon dioxide in soil has greater inhibitory effect on water absorption, (}) carbon dioxide causes an increase in the viscosity of protoplasm, (©) carbon dioxide causes decrease in the root's permeability to water, (d) all of the above

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; 32, When the wall of the root hairs becomes lignified and suberized with advancing age, ; (a) they show rapid absorption of water, , ; (b) they become more elastic, , (c) their ability to absorb water becomes limited, , (@) they show increase in the uptake of solutes, , response do you expect?, (a) water will move out of the plant instead of being absorbed, (b) water will move inside the plant, (c) there will be no reaction, (d) root growth will increase, Q.34. The soil factors that affect absorption of water by root are, (a) temperature (6) osmotic potential of the soil solution, (c) aeration and availability of water (@) all of the above, Q.35. Low temperature reduces the absorption of water because, (a) at low temperature solution becomes more viscous and its mobility retards, , (¢) both (a) and (b), (4) none of the above, Q.36. Which of the following plant is expected to cause dryness of soil?, , (a) Eucalyptus (6) Ficus, , (c) Eichhornia (@) Azadirachta (Neem), Q.37. In water logged fields, crops show signs of wilting, because, , (@) soil is more aerated (®) soil gets cool, , (c) amount of CO, increases in the soil (d) all of these, Q.38. The soil water easily available to the root system is, , (@) capillary water (b) imbibitional water, ' (¢) hygroscopic water (4) gravitational water protoplast, Q.39. The transport of water and salt takes place through, {a) phloem (&) xylem, I (©) sieve tubes (@) sclerenchyma, Q.40. In root hair, water enters due to :, (a) osmotic concentration (0) turgor pressure, (c) wall pressure (d) diffusion pressure, , Q.41. Many transplanted seedlings may not survive because, (a) they do not like the new soil, (®) they do not get the required mineral salts, (0) the leaves get damaged during the transfer, (@) most of the root hairs are lost during transplantation, , , , Q.33. If the water potential of the soil solution is more negative than the cell sap of the root cells, what, , (b) at low temperature protoplasm is less permeable to water and root growth is inhibited

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Qa2, , Q.43., , Q44., , Q.45., , az., , . (©) plants take in a small] quantity of mineral salts through root hairs, , Q.49,, , Q50., , (¢), , Q51., , Q52., , |. Root hairs absorb water from the soil with the help of, , In root hair, water enters due to, , (a) Diffusion ®we, (TP ° (or, Passive water absorption by roots system is due to, (@) forces created in the cells of the root (b) osmotic force in the shoot system 4, (c) increased respiratory activity in the cell of the root (d) tension in the sap due to transpiration, Attraction of water molecules to polar surface is known as 3, (@) adhesion (b) tensile strength, , (©) surface tension (@) cohesion, , The path of water and solutes from the soil to the conducting tissue of the root is, , {a) soil —+ root hair— cortex—+ endodermis — pericycle — proto xylem — phloem, (b) soil — root hair— cortex — endodermis — pericycle — proto xylem —> meta xylem, (¢) soil — root hair — cortex— pericycle —+ endodermis —+ proto xylem — meta xylem, (@) none, , Water will be absorbed by root hairs when, , (a) concentration of salts in the soil is high, , (b) concentration of solutes in the cell sap is high, , (the plant is rapidly respiring, , (@) they are separated from the soil by a semipermeable membrane, , Which of the following statements is wrong?, , (2) plants absorb only one thing at a time- water or inorganic salt, , (6) water and inorganic salts are taken in simultaneously by root hairs, , , , (@) roots are one of the main absorbing organs of the plant, , (a) root pressure (b) suction pressure, , (¢) TP (Turgor Pressure) . (4) OP (Osmotic Pressure), Entry of water from soil to xylem is through ., , (a) gradient of imbibition (b) gradient of suction pressure, (¢) gradient of turgor pressure (d) gradient of ion concentration, , The specific part of the root which is concerned with the absorption of water, , (a) zone of elongation (b) zone of maturation ids, (©) root hair cell (@) all of the above v4, COMPLETE THE FOLLOWING STATEMENTS BY CHOOSING THE APPROPRI I, OPTION FOR EACH BLANK:, , Root pressure is responsible for ______ absorption of water, ", (2) passive (b) active “leg, (©) both (@) and (6) (d) none tf, Water absorption through roots can be increased by keeping the potted plant Mt, (a) in the shade (b) in dim light i, , (¢) under the fan (d) covered with a polythene bag CNR