Root pressure develops due to
(a) passive absorption
(b) active absorption
(c) increase in transpiration
(d) low osmotic potential in soil.

1 Answer

Answer :

(b) active absorption

Related questions

Description : Water potential in leaf tissue is “positive” (near zero) during: (a) Low transpiration (b) Excessive absorption (c) Excessive transpiration (d) Gestation

Last Answer : Ans. ((d))

Description : $ those subtances which reduce the rate of transpiration are called transpirants. ! Imbibition causes Osmotic pressure.

Last Answer : $ those subtances which reduce the rate of transpiration are called transpirants. ! Imbibition causes Osmotic ... D. If both As and R are wrong.

Description : Potometer works on the principle of (a) osmotic pressure (b) amount of water absorbed equals the amount transpired (c) root pressure (d) potential difference between the tip of the tube and that of the plant.

Last Answer : (b) amount of water absorbed equals the amount transpired

Description : The osmotic theory of active water absorption was first given by

Last Answer : The osmotic theory of active water absorption was first given by A. Kramer(1941) B. Eaton (1943) C. Atkins (1916 ) D. Priestley (1923)

Description : When water enters in roots due to diffusion, is termed as (a) osmosis (b) passive absorption (c) endocytosis (d) active absorption.

Last Answer : (b) passive absorption

Description : The effect of cohesion on a soil is to A) Reduce both the active earth pressure intensity and passive earth pressure intensity (B) Increase both the active earth pressure intensity and ... (D) Increase the active earth pressure intensity but to reduce the passive earth pressure intensity

Last Answer : Answer: Option C

Description : Water from soil enters into the root hairs owing to : (1) Atmospheric pressure (2) Capillary pressure (3) Root pressure (4) Osmotic pressure

Last Answer : (2) Capillary pressure Explanation: In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, ... the difference in water potential between the soil and the substomatal cavity caused by transpiration.

Description : Water from soil enters into the root hairs owing to : (1) Atmospheric pressure (2) Capillary pressure (3) Root pressure (4) Osmotic pressure

Last Answer : Capillary pressure

Description : The absorption of intact protein from the gut in the foetal and newborn animals takes place by (A) Pinocytosis (B) Passive diffusion (C) Simple diffusion (D) Active transport

Last Answer : A

Description : Select the correct match of the digested products in humans given in column I with their absorption site and mechanism in column II. Column I Column II (a) Glycerol, fatty acids Duodenum, ... , glucose Small intestine, active absorption (d) Fructose, Na+ Small intestine, passive absorption

Last Answer : (c) Glycine, glucose Small intestine, active absorption

Description : 04. The main mechanism of most drugs absorption in GI tract is: a) Active transport (carrier-mediated diffusion) b) Filtration (aqueous diffusion) c) Endocytosis and exocytosis d) Passive diffusion (lipid diffusion)

Last Answer : PHARMACOKINETICS

Description : Guttation is mainly due to (a) root pressure (b) osmosis (c) transpiration (d) imbibition.

Last Answer : (a) root pressure

Description : The lateral earth pressure coefficients of a soil, Ka for active state, Kp for passive state and Ko for at-rest condition, compare as : (a) Ko < Ka < Kp (b) Ka < Ko < Kp (c) Ka < Kp < Ko (d) Kp < Ko < Ka

Last Answer : (b) Ka < Ko < Kp

Description : Wilting of plants occurs due to excessive : (1) Respiration (2) Guttation (3) Absorption (4) Transpiration

Last Answer : Transpiration

Description : Differentiate between Osmotic Pressure and Osmotic Potential. -Biology

Last Answer : answer:

Description : When a cell is fully turgid, which of the following will be zero? (a) Turgor pressure (b) Water potential (c) Wall pressure (d) Osmotic pressure

Last Answer : (b) Water potential

Description : In plant-water relationships, symbol ‘YW’ is used to represent (1) Osmotic pressure (2) Water potential (3) Solute potential (4) Osmosis

Last Answer : Water potential

Description : The moisture deficit condition, results when the amount of water vapour available in the soil is not sufficient to meet the demand of potential evapo-transpiration

Last Answer : Ans.Drought

Description : Pick up the correct statement from the following: (A) The rise of the ground surface due to frost action is called frost heave (B) The freezing of water is accompanied by a volume increase of 9% (C) Below freezing point, higher soil suction develops (D) All the above

Last Answer : (D) All the above

Description : The oral absorption of following osmotic diuretic is negligible (a) Glycerin (b) Mannitol (c) Isosorbide (d) All of the above

Last Answer : Ans: B

Description : The major principal stress in an element of cohesion-less soil within the backfill of a retaining wall is (A) Vertical if the soil is in an active state of plastic equilibrium (B) Vertical if the ... state of plastic equilibrium (C) Inclined at 45° to the vertical plane (D) None of the above

Last Answer : Answer: Option A

Description : The translocation of organic solutes in sieve tube members is supported by (a) cytoplasmic streaming (b) root pressure and transpiration pull (c) P-proteins (d) mass flow involving a carrier and ATP

Last Answer : (a) cytoplasmic streaming

Description : Guttation is the result of (a) diffusion (b) transpiration (c) osmosis (d) root pressure.

Last Answer : (d) root pressure.

Description : Transpiration and root pressure cause water to rise in plants by (a) pushing it upward (b) pushing and pulling it, respectively (c) pulling it upward (d) pulling and pushing it, respectively.

Last Answer : (d) pulling and pushing it, respectively.

Description : The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is (a) transpiration (b) root pressure (c) imbibition (d) plasmolysis.

Last Answer : b) root pressure

Description : Excessive use of chemical fertilisers causes shrivelling of the roots and wilting of the plant, because the (A) Osmotic pressure of the soil water becomes less than that of the plant sap (B) Soil ... pressure of the soil water becomes higher than that of the plant sap (D) Soil becomes too acidic

Last Answer : (C) Osmotic pressure of the soil water becomes higher than that of the plant sa

Description : Choose the correct statement about osmotic diuretics: A. They are large molecular weight substances which form colloidal solution B. Their primary site of action is collecting ducts in the ... C. They increase water excretion without increasing salt excretion D. They can lower intraocular pressure

Last Answer : D. They can lower intraocular pressure

Description : Honey that has high concentration of sugar does not decay because (1) Bacteria cannot survive in an active state as it is totally deprived of oxygen (2) It contains natural antioxidant that prevents bacterial ... state in a solution of high osmotic strength as water is drawn out (4) None of these

Last Answer : (3) Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out Explanation: The reason why bacteria does not grow in high concentration of sugar ... measure of unbound, free water molecules in the food that is necessary for microbial survival and growth.

Description : Honey that has high concentration of sugar does not decay because (1) Bacteria cannot survive in an active state as it is totally deprived of oxygen (2) It contains natural antioxidant that prevents bacterial ... state in a solution of high osmotic strength as water is drawn out (4) None of these

Last Answer : Bacteria cannot survive in an active state in a solution of high osmotic strength as water is drawn out

Description : The process of producing energy in plants is known as – (1) Absorption (2) Reduction (3) Photosynthesis (4) Transpiration

Last Answer : (3) Photosynthesis Explanation: Photosynthesis is the process by which plants, some bacteria and some protistans use the energy from sunlight to produce glucose from carbon dioxide and water.

Description : Active and passive transports across cell membrane differ in (a) passive transport is nonselective (b) passive transport is along the concentration gradient while active transport is due to metabolic ... (d) passive transport is confined to anions while active transport is confined to cations.

Last Answer : (b) passive transport is along the concentration gradient while active transport is due to metabolic energy

Description : Bacterial cells susceptible to penicillium can be protected from destruction if the medium in which they are exposed is of A- high osmotic pressure B- low osmotic pressure C- moderate osmotic pressure D- high surface tension

Last Answer : high osmotic pressure

Description : Oncotic pressure refers to a) the osmotic pressure exerted by proteins. Oncotic pressure is a pulling pressure exerted by proteins, such as albumin. b) the number of dissolved particles contained in a ... . Osmotic pressure is the amount of pressure needed to stop the flow of water by osmosis.

Last Answer : a) the osmotic pressure exerted by proteins. Oncotic pressure is a pulling pressure exerted by proteins, such as albumin.

Description : Water potential and osmotic potential of pure water are

Last Answer : Water potential and osmotic potential of pure water are A. Zero and zero B. 100 and zero C. 100 and 100 D. zero and 100

Description : The water potential and osmotic potential of pure water are (a) 100 and 200 (b) zero and 100 (c) 100 and zero (d) zero and zero.

Last Answer : (d) zero and zero.

Description : Coefficient of earth pressure at rest is (A) Less than active earth pressure but greater than passive earth pressure (B) Greater than active earth pressure but less than passive earth pressure ... earth pressure and passive earth pressure (D) Less than both the active and passive earth pressures

Last Answer : (B) Greater than active earth pressure but less than passive earth pressure

Description : the coefficient of the active pressure Ka is 1/3, the coefficient of passive pressure Kp, is (A) 1/3 (B) 2/3 (C) 1 (D) 3

Last Answer : Answer: Option D

Description : Differentiate between active and passive earth pressure.

Last Answer : Active earth pressure and passive earth pressure are two types of soil pressures that occur on retaining walls and other structures that are built into or on top of soil. Active earth pressure is the pressure ... is the soil pressure that acts on the wall when the soil is in front of the wall.

Description : Water molecules enter plant epidermal cells by: a) osmosis b) active transport c) translocation d) transpiration

Last Answer : ANSWER: A -- OSMOSIS

Description : Negative skin friction (A) Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile (B) Develops due to lowering of ground water (C) Both (a) and (b) (D) Neither (a) not (b)

Last Answer : Answer: Option C

Description : If PE denotes monthly average value of potential evapo–transpiration and R stands for monthly average rainfall, the period having PE/4 greater than or equal to R, is designated as...... (A) Moist (B) Humid (C) Moderately Dry (D) Severe Drought (E) Dry

Last Answer : (C) Moderately Dry

Description : In soil, the water available for root absorption is (a) gravitational water (b) capillary water (c) hygroscopic water (d) combined water

Last Answer : (b) capillary water

Description : Passive absorption of minerals depends on (a) temperature (b) temperature and metabolic inhibitor (c) metabolic inhibitor (d) humidity

Last Answer : (a) temperature

Description : The success of oral rehydration therapy of diarrhoea depends upon the following process in the intestinal mucosa: A. Sodium pump mediated Na+ absorption B. Glucose coupled Na+ absorption C. Bicarbonate coupled Na+ absorption D. Passive Na+ diffusion secondary to nutrient absorption

Last Answer : B. Glucose coupled Na+ absorption

Description : In plants water is absorbed by the root hairs by a process called: (1) Transpiration (2) Respiration (3) Perspiration (4) Osmosis

Last Answer : (4) Osmosis Explanation: Plants absorb water from their root hairs on the root via osmosis. It is then transported to other parts of the plant. (through the network of xylem vessels) through a combination of capillary action and "transiprational pull".

Description : The basic underlying principle of using a mist propagation system is that it: a. Keeps the propagation medium uniformly moist and supplies moisture to the base of the cuttings b. ... medium to promote root formation and development d. Increases humidity around the cutting and reduces transpiration

Last Answer : Increases humidity around the cutting and reduces transpiration

Description : In plants water is absorbed by the root hairs by a process called: (1) Transpiration (2) Respiration (3) Perspiration (4) Osmosis

Last Answer : Osmosis

Description : A low-voltage protection circuit is used in electric motor starting equipment to _____________. A. trip circuit contactors when the motor overspeeds due to low voltage B. trip circuit ... voltage without manually resetting D. prevent the motor from restarting automatically on restoration of voltage

Last Answer : Answer: D

Description : Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation? (A) Decrease in effect (B) Increase in thrust (C) Develops noise (D) Develops high pressure

Last Answer : (D) Develops high pressure