CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 7 - MCQExams.com

Loss of water in the form of water vapour from plants to atmosphere is called as
  • Photosynthesis
  • Respiration
  • Transpiration
  • Excretion
Which of the following features does all gas exchange have in common?
  • They are enclosed within ribs.
  • They are maintained at constant temperature.
  • The exchange surfaces are moist.
  • They are exposed to air.
The loss of the water from leaves of plants is called as
  • Translocation
  • Trasnspiration
  • Transfusion
  • None of the above
Loss of water from the tip of the leaf pores in a plant is known as 
  • Transpiration.
  • Guttation.
  • Evaporation.
  • Respiration.
The process in which cells lose water in a hypertonic solution is called as 
  • Endosmosis
  • Plasmolysis
  • Cyclosis
  • None of the above
The main function of phloem is translocation of:
  • Food
  • Water
  • Minerals
  • Air
Water obeys 
  • The law of pressure
  • The law of diffusion
  • Both A and B
  • None of the above
Water potential of pure water and its solution are
  • 0 and 1
  • 0 and 0
  • 0 and more than one
  • 0 and less than 1
Process by which both living and dead tissues absorb water ?
  • Diffusion
  • Osmosis
  • Imbibition
  • All of the above
When dried seeds are placed in water they absorb water and swell this because of
  • Inhibition
  • Adsorbtion of water
  • Both
  • Absorption of water
The pressure applied to stop the flow from low concentration solution to high concentration through a semipermeable membrane is
  • Vaccum pressure
  • Vapour pressure
  • Osmotic pressure
  • Atmospheric pressure
The process of loss of water through the leaves and stem is called 
  • Transpiration
  • Respiration
  • Photosynthesis
  • Photorespiration 
Pressure caused by water entering the root from soil is known as
  • Imbibition 
  • Root pressure
  • Turgor pressure
  • Wall pressure
Substances which can be moved through diffusion in plants are
  • Ions
  • Sugar
  • Urea
  • All of the above
Transpiration occurs through .......... and guttation occurs through .......... in the plants.
  • Hydathodes, stomata
  • Stomata, cuticle
  • Stomata, hydathodes
  • Hydathodes, lenticles
The phenomenon by which a substance absorbs a liquid and swells, but does not necessarily dissolve in the liquid is known as
  • Diffusion
  • Root pressure
  • Imbibition
  • Osmosis
Which of the following states the importance of diffusion?
  • Helps in exchange of gases during respiration.
  • Helps in exchange of gases during photosynthesis.
  • Responsible for transpiration.
  • All of the above
Root pressure is a _______
  • Pulling force
  • Pushing force
  • Both A and B
  • None of these
Root pressure can be measured by
  • Attaching a barometer to the cut end of the stem
  • Attaching a manometer to the cut end of the stem
  • Attaching a thermometer to the cut end of the stem
  • Attaching a potometer to the cut end of the stem
If the stem of the plant is cut just above the root then
  • Water will seep or exude out of the cut end for a considerable amount of time.
  • Water will seep or exude out of the cut end continuously
  • Both A and B
  • None of these
How much pressure would be required to raise water to the top of a $$416$$ ft. high tree ?
  • $$1$$ atm
  • $$13$$ atm
  • $$-77$$ bars
  • All of the above
Root pressure helps in

i Continuous flow of water in plants
ii Pulling force
iii Replacement of lost water
  • i, ii
  • ii, iii
  • i, iii
  • All of the above
Which of the following would exert maximum osmotic pressure ?
  • Decinormal aluminium sulphate
  • Decinormal barium chloride
  • Decinormal sodium chloride
  • A solution obtained by mixing equal volumes of (b) and (c) and filtering
................ is the change in the value of a quantity with change in another variable.
  • Variant
  • Valency
  • Gradient
  • Density
Who defined the term root pressure? 
  • Stephan Hales
  • Mendel
  • Griffith
  • Godiewski
Osmosis occurs in gases.
  • True
  • False
The transport system in plants is made up of
  • Xylem
  • Vascular tissues
  • Phloem
  • None of the above
Food substances travel up and down through ______
  • Xylem
  • Pholem
  • Both A and B
  • None of these
The diagram shows four different cells. Which cells provide a large surface area for absorption?

455364_6d61a312be0a42d0b79c32cfbbd1d9d4.png
  • 1 and 2
  • 1 and 3
  • 2 and 4
  • 3 and 4
Which of the following method involves the movement of molecules from the region of higher concentration to the lower concentration?
  • Diffusion
  • Osmosis
  • Chemiosmosis
  • Plasmolysis
A professor wanted to demonstrate a physiological process. He filled a glass bottle with previously moistened gram seeds. He capped the bottle tightly and kept it away in a corner, and resumed the lecture. After about 45 minutes there was a sudden explosion with shattering of the glass bottle into pieces of glass. Which of the following phenomenon did the professor wants to demonstrate?
  • Diffusion
  • Imbibition
  • Anaerobic respiration
  • Osmosis
The correct ascending order of the cell with respect to their water potential is
ABCD
$$\pi$$-0.8Mpa -1.0 Mpa-0.9MPa-0.3 MPa
P+0.4 Mpa+0.5Mpa+0.2Mpa0.2Mpa
  • A, B, C, D
  • C, B, A, D
  • C, A, B, D
  • C, D, B, A
The respiratory gas movement in a bacterium takes place by which of the following methods?
A student cut a 2cm$$^3$$ block out of a potato and weighed the block. She then placed the block in distilled water and waited for an hour. Which of the following conditions will occur when she reweighs the block?
  • The mass increases due to plasmolysis.
  • The mass increases because the potato is hypertonic to the water.
  • The mass decreases because the potato will loose its water
  • The mass decreases because of the higher water potential in the potato.
  • The mass remains the same because there are no living components in this system.
Guttation occurs through the
  • Roots.
  • Hydathode.
  • Trichome.
  • Stomata.
In higher plants, continuity of cytoplasm from one cell to its neighboring cells is established through the
  • Apoplast
  • Chloroplast
  • Leucoplast
  • Symplast
Which of the following enzymes helps in crossing plasma membrane?
  • Protease
  • Pepsin
  • Dehydrogenase
  • Permease
Imbibition occurs when 
  • Grapes are dipped in saturated solution.
  • Wood is placed in ether.
  • Rubber is dipped in ether.
  • Rubber is dipped in water.
1 gm molar solution is :
  • 1 gm mole of solute dissolved in 1000 ml of solvent.
  • 1 gm mole of solute dissolved in 1000 ml of solution.
  • 1 gm of solute dissolved in 1000 ml of solvent.
  • 1 gm of solute dissolved in 1000 ml of solution.
Study the following table showing the components of water potential of three mesophyll cells A, B and C.
Cell
Osmotic potential (Mpa)
Pressure potential (Mpa)
A
B
C
-0.6
-0.5
-0.9
0.2
0.3
0.4
If the above cells are in direct contact with each other, than the water moves at the lowest rate between the two mesophyll cells.
  • C$$\rightarrow $$B
  • B$$\rightarrow $$C
  • B$$\rightarrow $$A
  • A$$\rightarrow $$C
 (I) Linear growth Intercalary meristem  Leaf base of the grass plant
 (II) Aerenchyma Buoyancy Bryophyllum
 (III) Trichosclereids Isodiametric in shape Aerial roots of Swiss cheese plant
 (IV) Water stomata Guttation Root pressure
Study the combinations and identify the correct matches.
  • (II), (III)
  • (I), (II)
  • (I), (IV)
  • (I), (III)
A cell membrane controls what goes in and out of the cell. Because of the hydrophilic and hydrophobic regions of the phospholipid bilayer, small nonpolar molecules cross the membrane easily, while large and hydrophilic molecules cannot cross easily.
The term used to describe this differential movement of molecules across a membrane is
  • Passive transport
  • Selective permeability
  • Osmosis
  • Diffusion
Read the given passage and answer the following question.

Wet mounts of three living samples of Elodea cells are prepared for viewing under the light microscope. Each slide is mounted with a different solution and viewed after 5 minutes.
Sample A - Elodea + 5 drops of 10% NaCl
Sample B - Elodea + 5 drops of Isotonic saline
Sample C - Elodea + 5 drops of distilled water

Which of the following process is illustrated by the experiment?
  • Hydrolysis
  • Dehydration
  • Active transport
  • Polymerization
  • Osmosis
A cell membrane regulates which substances can enter and leave the cell based on their size and polarity . Which mode of cell transport is the movement of a substance from a high concentration to an area of lower concentration without the use of protein channels or energy?
  • Simple diffusion
  • Facilitated diffusion
  • Osmosis
  • Active transport
  • Isotonic
An experiment was conducted to determine the effect of concentration on the rate of diffusion. A student filled six dialysis bags with different concentrations of salt solutions and placed each of them in a separate beaker of distilled water.
Dialysis bags model the selective permeability of cell membranes and allow small molecules, ions and water to pass through according to the surrounding concentration gradient. A conductivity probe was used to measure the change in concentration of ions in the beaker over time.

Which curve on the graph below accurately predicts the rate of diffusion as a function of salinity?
526950_ed9ff97e962b418d8ea63b89a52f2e80.png
  • A
  • B
  • C
  • D
The process responsible for the movement of water from roots to all other parts of plants is
  • Evaporation of water from the leaves.
  • Capillary action.
  • Hydrophyllic compounds.
  • Active transport.
  • Both A and B.
A carrier protein transfers a solute across the phospholipid bilayer via facilitated diffusion which behaves much like an enzyme-substrate reaction.

A distinction between the process by which an enzyme converts substrate to product and facilitated transport is
  • Solutes are able to undergo transport without chemical modification.
  • Solutes are restricted to flow in one direction depending on the orientation of the carrier protein.
  • Solutes are directly transported without interacting with or influencing the conformational state of the carrier protein.
  • Solutes are transported whether or not there is a competitive or noncompetitive inhibitor present.
What would happen to a plant cell placed in a hypotonic solution?
  • Lyse
  • Swell but remain intact
  • Shrivel
  • Remain unchanged
  • Take up solutes
A cell membrane regulates which substances can enter and leave the cell based upon their size and polarity. Which mode of the cell transport is the movement of water down its concentration gradient?
  • Facilitated diffusion
  • Osmosis
  • Simple diffusion
  • Passive transport
  • Active transport
Facilitated diffusion involves the movement of
  • Small, charged and polar molecules with the help of ATP.
  • Small, neutral and nonpolar molecules with the help of ATP.
  • Small, neutral and nonpolar molecules without an ATP requirement.
  • Small, charged and polar molecules without an ATP requirement.
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