Please refer to Chapter 11 Transport in Plants MCQ Class 11 Biology with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Biology. Students should refer to MCQ Questions for Class 11 Biology with Answers to score more marks in Grade 11 Biology exams. Students should read the chapter Transport in Plants and then attempt the following objective questions.

MCQ Questions Class 11 Biology Chapter 11 Transport in Plants

The Transport in Plants MCQ Class 11 Biology provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and early morning is:
(a) Root pressure
(b) Imbibition
(c) Plasmolysis
(d) Transpiration

Question. Rate of transpiration depends upon
(a) Increase or decrease of atmospheric temperature
(b) Increase in light intensity upto certain limit.
(c) Difference in vapour pressure of intercellular spaces of mesophyll tissue and atmospheric air.
(d) All of these

Question. Entry of water from soil to xylem is through:
(a) Gradient of ion concentration
(b) Gradient of suction pressure
(c) Gradient of imbibition
(d) Gradient of turgor pressure.

Question. The main difference between active and passive transport across cell membrane is :
(a) passive transport is non-selective whereas active transport is selective
(b) passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes.
(c) passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel.
(d) active transport occurs more rapidly than passive

Question. Which one gives the most valid and recent explanation for stomatal movements?
(a) Transpiration
(b) Potassium influx and efflux
(c) Starch hydrolysis
(d) Guard cell photosynthesis

Question. Loss of water by cells without external sign of leaf dropping is called
(a) Nascent wilting
(b) Incipient wilting
(c) Temporary wilting
(d) Permanent wilting

Question. The movement of molecules of solids, liquids and gases from the region of their higher concentration or kinetic energy through semi- permeable membrane to the region of lower concentration or kinetic energy is termed as
(a) Imbibition
(b) Diffusion
(c) Osmosis
(d) All of these

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

Question. up denotes to
(a) Water potential
(b) Negative potential
(c) Pressure potential
(d) Solute potential

Question. Rupture and fractionalization of water column present in treachery elements does not occur during ascent of sap due to
(a) Cohesion and adhesion
(b) Lignified thick walls
(c) Weak gravitational pull
(d) Transpirational pull

Question. The form of sugar transported through the phloem is
(a) Sucrose
(b) Fructose
(c) Ribose
(d) Glucose

Question. In plants, capillarity is aided by the small diameter of
(a) Trachery elements
(b) Cortical cells
(c) Parenchyma cells
(d) Phloem tissue

Question. Assertion Dried seeds of Pea are kept in tin, water is poured over them up to upper level. A lid is put tight over it. Within an hour the lid is blown off Reason Due to rapid cell division in Pea seeds .
(a) If both the assertion and reason are true and reason explains the assertion.
(b) If both the assertion and reason are true but reason does not explain the assertion
(c) If assertion is true but reason is false
(d) If assertion is false but reason is true

Question. Exchange of substances between a cell and its environment is due to .
(a) Osmosis
(b) Active transport
(c) Diffusion
(d) All the above

Question. Who is called the father of plant physiology?
(a) K.V. Thimann
(b) Stephan Hales
(c) M.Calvin
(d) E. Rabinowitch

Question. A cell is plasmolysed after being kept in a hypertonic solution what will be present between cell wall and plasmalemma
(a) Isotonic solution
(b) Hypertonic solution
(c) Air solution
(d) Hypotonic solution

Question. Percentage of water left in the soil when plant wilts is known as
(a) Turgidity
(b) Wilting coefficient
(c) Field capacity
(d) Water retaining power of the soil

Question. The rate of absorption is stimulated by
(a) Auxins
(b) CO
(c) Acids
(d) Cyanides

Question. A soil is said to be physiologically dry when it has no
(a) Capillary water
(b) Hygroscopic water
(c) Combined water
(d) All of these

Question. Stomata in angiosperms open and close due to
(a) Their genetic constitution
(b) Effect of hormones
(c) Change of turgor pressure in guard cells
(d) Pressure of gases inside the leaves

Question. Osmotic pressure in a vacuolated plant cell is usually
(a) Less than DPD
(b) More than DPD
(c) Equal to TP
(d) Equal to WP

Question. Action spectrum of transpiration is
(a) Orange & red
(b) Blue & red
(c) Blue & far red
(d) Green & Ultraviolet

Question. Transport over longer distances proceeds through the vascular system
(a) Osmosis
(b) Translocation
(c) Transpiration
(d) Diffusio

Question. The rate of transpiration of a plant would gradually increase if
(a) Relative humidity decreases
(b) Relative humidity remains unchanged
(c) Relative humidity increases
(d) Water potential gradient remains unchanged

Question. The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is … .. [NEET 2020]
(a) Imbibition
(b) Plasmolysis
(c) Transpiration
(d) Root pressure

Question. Plants exchange water with environment through structures by two cells
(a) stomata
(b) Lenticles
(c) Hydathodes
(d) None of these

Question. Root hairs absorb water from soil with the help of
(a) Root pressure
(b) Osmotic pressure
(c) Suction pressure
(d) Turger pressure

Question. What is the effect of turgor pressure in Munch hypothesis?
(a) Increase of turgor pressure
(b) Decrease of turgor pressure
(c) No change in turgor pressure
(d) Independent to water potential gradient

Question. Active transport occurs
(a) Along concentration gradient & requires ATP.
(b) Along concentration gradient but not requires ATP
(c) Against concentration & requires ATP
(d) Against concentration but does not requires ATP

Question. In flowering plants, translocation of sugar occurs in the form of
(a) Sucrose
(b) Maltose
(c) Glucose
(d) Starch

Question. Positive pressure developed in tracheary elements of the root as a result of metabolic activities of the root of plant for pushing the water upwards through xvlem into the shoot system is termed
(a) Diffusion pressure
(b) Osmotic pressure
(c) Turgor pressure
(d) Root pressure.

Question. Which of the following facilitates opening of stomatal aperture :-
(a) Contraction of outer wall of guard cells
(b) Decrease in turgidity of guard cells
(c) Radial orientation of cellulose microfibrils in the cell wall of guard cells
(d) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

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

Question. Stomata are mainly concerned with
(a) Transpiration
(b) Gaseous exchange
(c) Both (a) and (b)
(d) none of these.

Question. …………. and …………. are the two main components that determine water potential.

Question. Phloem tissue is composed of ………….. which form long columns with holes in their end walls called sieve plates

Question. The …………. movement of water occurs exclusively through the intercellular spaces and the walls of the cells.

Question. …………. is very important to plants since it the only means for gaseous movement within the plant body.

Question. Imbibition is a special type of diffusion when water is absorbed by solids-colloids-causing them to enormously increase in volume.

Question. Surface Tension- attraction of water molecules to polar surfaces (such as the surface of tracheary elements).

Question. Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure.

Question. Water potential is denoted by the greek symbol psi or ψ and is expressed in pressure units such as pascals (Pa).

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