MERIT YARD

[Transport in Plants - VVI MCQs - MERIT YARD]

Question 1 / 40Which of the following process does not require metabolic energy?

A) Simple diffusion

B) Active transport

C) Na-K pump

D) Bulk flow

Question 2 / 40Water potential of pure water at standard temperature is:

A) 100

B) 10

C) Zero

D) -1

Question 3 / 40Movement of water through the cell wall and intercellular spaces is:

A) Symplast

B) Apoplast

C) Transmembrane path

D) Osmosis

Question 4 / 40The process by which water is lost in liquid form from the margins of leaves:

A) Transpiration

B) Guttation

C) Evaporation

D) Imbibition

Question 5 / 40Which theory is most widely accepted for water transport in tall trees?

A) Root pressure theory

B) Cohesion-Tension-Transpiration pull

C) Pulsation theory

D) Capillarity

Question 6 / 40Plasmolysis occurs when a cell is placed in:

A) Isotonic solution

B) Hypotonic solution

C) Hypertonic solution

D) Pure water

Question 7 / 40Phloem transport is generally:

A) Unidirectional

B) Bidirectional

C) Only downwards

D) Radial

Question 8 / 40The pressure exerted by the protoplast against the cell wall is:

A) Wall pressure

B) Turgor pressure

C) Osmotic pressure

D) Suction pressure

Question 10 / 40Seeds swell when placed in water due to:

A) Diffusion

B) Imbibition

C) Osmosis

D) Plasmolysis

Question 11 / 40Guttation occurs through specialized structures called:

A) Stomata

B) Lenticels

C) Hydathodes

D) Trichomes

Question 12 / 40Osmotic potential ($\Psi_s$) is always:

A) Positive

B) Negative

C) Zero

D) One

Question 13 / 40Transpiration is measured by:

A) Auxanometer

B) Potometer

C) Clinostat

D) Porometer

Question 14 / 40Water movement through the interconnected protoplasts via plasmodesmata is:

A) Symplast

B) Apoplast

C) Vacuolar path

D) Imbibition

Question 15 / 40Root pressure is responsible for:

A) Guttation

B) Transpiration

C) Ascent of sap in tall trees

D) Photosynthesis

Question 16 / 40Facilitated diffusion requires _________ but no energy.

A) Hormone

B) Carrier proteins

C) ATP

D) Vacuole

Question 17 / 40Transpiration pull can lift water column up to:

A) 10 metres

B) 130 metres

C) 50 metres

D) 200 metres

Question 18 / 40Opening of stomata is due to:

A) Turgidity of guard cells

B) Flaccidity of guard cells

C) Loss of water

D) Decrease in pH

Question 19 / 40Substance commonly used for 'Girdling Experiment':

A) Xylem

B) Phloem

C) Bark

D) Pith

Question 20 / 40The direction of water movement between two cells depends on:

A) Water potential gradient

B) Gravity

C) Cell size

D) Surface area

Question 21 / 40Munch's hypothesis is related to:

A) Transpiration

B) Translocation of solutes

C) Ascent of sap

D) Mineral absorption

Question 22 / 40Water moves from __________ water potential to __________ water potential.

A) High, Low

B) Low, High

C) Negative, Positive

D) Zero, Positive

Question 23 / 40Xylem transport is strictly:

A) Unidirectional

B) Bidirectional

C) Multidirectional

D) Lateral

Question 24 / 40When osmotic pressure equals turgor pressure, the DPD is:

A) Zero

B) Maximum

C) Negative

D) Double

Question 25 / 40Casparian strips prevent water flow in:

A) Epidermis

B) Pericycle

C) Endodermis

D) Hypodermis

Question 26 / 40Adhesion is the attraction of water molecules to:

A) Polar surfaces (tracheary elements)

B) Each other

C) Air

D) Gravity

Question 27 / 40Sucrose moves into sieve tubes by:

A) Passive transport

B) Active transport

C) Diffusion

D) Imbibition

Question 28 / 40Pure water has the __________ water potential.

A) Highest

B) Lowest

C) Average

D) Negative

Question 29 / 40Guard cells are kidney-shaped in:

A) Dicots

B) Monocots

C) Grasses

D) Gymnosperms

Question 30 / 40Guard cells are dumb-bell shaped in:

A) Mango

B) Grasses

C) Peepal

D) Sunflower

Question 31 / 40Force responsible for the ascent of sap is:

A) Transpiration pull

B) Root pressure

C) Imbibition

D) Guttation

Question 32 / 40Stomata open when guard cells are:

A) Turgid

B) Flaccid

C) Plasmolysed

D) Dead

Question 33 / 40Rate of transpiration increases with:

A) High humidity

B) High wind speed

C) Low temperature

D) Darkness

Question 34 / 40Guttation happens during:

A) Night and early morning

B) Afternoon

C) Mid-day

D) Summer only

Question 35 / 40The value of water potential is designated by the Greek symbol:

A) Psi ($\Psi$)

B) Alpha ($\alpha$)

C) Beta ($\beta$)

D) Delta ($\Delta$)

Question 36 / 40Phloem sap is mainly:

A) Water and Minerals

B) Water and Sucrose

C) Minerals and Hormones

D) Only Proteins

Question 37 / 40Porins are proteins that form huge pores in:

A) Outer membrane of Plastids

B) Inner membrane of Mitochondria

C) Cell wall

D) Vacuole

Question 38 / 40Transpiration is a _________ process.

A) Chemical

B) Physical

C) Active

D) Non-physiological

Question 39 / 40Water channel is made up of how many types of aquaporins?

A) 4

B) 8

C) 2

D) 10

Question 40 / 40The loss of water through stomata is called:

A) Guttation

B) Exudation

C) Transpiration

D) Bleeding