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Transport in Plants Class 11 MCQs Questions with Answers
Solving the Transport in Plants Multiple Choice Questions of Class 11 Biology Chapter 11 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Transport in Plants Class 11 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 11 Biology Class 11 and cross-check your answers during preparation.
I. Select the correct answer from the following Questions:
Question 1.
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
Answer
Answer: (b) Diffusion
Question 2.
The phenomenon of absorption of water or any other liquid by the soil particles of a colloidal substance without forming a solution is called
(a) Imbibition
(b) Diffusion
(c) Osmosis
(d) None of these
Answer
Answer: (a) Imbibition.
Question 3.
In a fully turgid cell turgor pressure (T.P.) is equal to
(a) Osmotic pressure
(b) Diffusion pressure deficit
(c) Wall pressure
(d) None of these.
Answer
Answer: (a) Osmotic pressure.
Question 4.
The contraction of the protoplast due to exosmosis when the cell is placed in hypertonic solution is called
(a) Deplasmolysis
(b) Plasmolysis
(c) Both (a) and (b)
(d) None of these.
Answer
Answer: (b) Plasmolysis.
Question 5.
If turgidity of a cell surrounded by water increases, the wall pressure will
(a) Decrease
(b) Increase
(c) Fluctuate
(d) Remain unchanged.
Answer
Answer: (b) Increase.
Question 6.
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.
Answer
Answer: (d) Root pressure.
Question 7.
Guttation in plants is regulated by
(a) Humidity
(b) Availability of water in soil
(c) Temperature
(d) AH of these.
Answer
Answer: (d) All of these.
Question 8.
The conducting tissue which takes part in the path of ascent of sap is
(a) xylem
(b) phloem
(c) Both (a) and (b)
(d) None of these.
Answer
Answer: (a) xylem.
Question 9.
Water potential in the leaf cells is positive during:
(a) Guttation
(b) Low transpiration
(c) Excessive transpiration
(d) Excessive absorption.
Answer
Answer: (d) Excessive absorption.
Question 10.
Stomata are mainly concerned with
(a) Transpiration
(b) Gaseous exchange
(c) Both (a) and (b)
(d) none of these.
Answer
Answer: (c) both (a) and (b).
Question 11.
Stomata open during day and close during night under inesophytic conditions in type.
(a) Leucerne
(b) Patato
(c) Cereal
(d) Barley
Answer
Answer: (a) Leuceme
Question 12.
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
Answer
Answer: (d) All of these.
Question 13.
The direction and rate of water movement from cell to cell is based on:
(a) Wall pressure
(b) Turgor pressure
(c) Incipient plasmolysis
(d) Diffusion pressure deficit.
Answer
Answer: (d) Diffusion pressure deficit.
Question 14.
Passive of water from one cell to another is controlled by:
(a) Wall pressure
(b) Diffusion pressure deficit
(c) Hydrostatic pressure
(d) Osmotic pressure.
Answer
Answer: (b) Diffusion pressure deficit.
Question 15.
Imbibition involves:
(a) Capillary
(b) Diffusion
(c) Osmosis
(d) Both (a) and (b)
Answer
Answer: (d) Both (a) and (b).
Question 16.
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.
Answer
Answer: (b) Gradient of suction pressure.
Question 17.
Plasmolysis occurs due to:
(a) Osmosis
(b) Endosmosis
(c) Exomosis
(d) Absorption
Answer
Answer: (c) Exomosis.
Question 18.
Which one of the following helps in holding the leaves position and soft stems to stay erect.
(a) Transpiration
(b) Turgidity of cells.
(c) Rigidity of the cell wall
(d) stomatal cells.
Answer
Answer: (b) Turgidity of cells.
Question 19.
Stomata open when the guard cells have:
(a) Less K+
(b) More K+
(c) More abscisic add
(d) AH of those.
Answer
Answer: (b) More Ki+
II. Fill in the blanks
Question 1.
Transport over longer distances proceeds through the vascular system and is called ………….
Answer
Answer: translocation
Question 2.
…………. is very important to plants since it the only means for gaseous movement within the plant body.
Answer
Answer: Diffusion
Question 3.
Water ehannels-made up of 8 different types of ………….
Answer
Answer: aquaporins
Question 4.
Water is essential for all ………… activities of the plant and plays a very important role in all living organisms.
Answer
Answer: physiological
Question 5.
…………. and …………. are the two main components that determine water potential.
Answer
Answer: Solute potential, pressure potential
Question 6.
Pressure potential is usually positive, though in plants negative potential or tension in the water column in the xylem plays a major role in water …………… up a stem.
Answer
Answer: transport
Question 7.
………. occurs spontaneously in response to a driving force.
Answer
Answer: Osmosis
Question 8.
If the external solution balances the osmotic pressure of the cytoplasm it is said to be …………
Answer
Answer: isotonic
Question 9.
Water and minerals and food are generally moved by a ……….. or ………… system.
Answer
Answer: mass, bulk flow
Question 10.
The …………. movement of water occurs exclusively through the intercellular spaces and the walls of the cells.
Answer
Answer: apoplastic
Question 11.
The ………… system is the system of interconnected protoplasts.
Answer
Answer: symplastic
Question 12.
…………. can only provide a modest push in the overall process of water transport.
Answer
Answer: Root pressure
Question 13.
Creates transpiration pull for ………….. and ………….. of plants.
Answer
Answer: absorption, transport
Question 14.
Ions are absorbed from the soil by both ………… and ………… transport.
Answer
Answer: passive, active
Question 15.
Phloem tissue is composed of ………….. which form long columns with holes in their end walls called sieve plates
Answer
Answer: sieve tube cells
III. Mark the statement true (T) or false (F)
Question 1.
Transport over longer distances proceeds through the vascular system (the xylem and the phloem) and is called transpiration.
Answer
Answer: False.
Question 2.
Diffusion rates are affected by the gradient of concentration, the permeability of the membrane separating them, temperature and pressure.
Answer
Answer: True.
Question 3.
Some channels are always open; others can be controlled. Some are large, allowing a variety of molecules to cross.
Answer
Answer: True.
Question 4.
When a molecule moves across a membrane independent of other molecules, the process is called uniport.
Answer
Answer: True.
Question 5.
A seed may appear dry but it still has water-otherwise it would not be alive and respiring.
Answer
Answer: True.
Question 6.
Water potential is denoted by the greek symbol psi or ψ and is expressed in pressure units such as pascals (Pa).
Answer
Answer: True.
Question 7.
Pressure can build up in a plant system when water enters a plant cell due to diffusion causing a pressure build up against the cell wall, it makes the cell turgid; this increases the pressure potential.
Answer
Answer: True.
Question 8.
The net direction and rate of osmosis depends on both the pressure gradient and concentration gradient.
Answer
Answer: True.
Question 9.
If the external solution balances the osmotic pressure of the cytoplasm it is said to be hypotonic.
Answer
Answer: False.
Question 10.
Water diffuses into the cell causing the cytoplasm to build up a pressure against the wall, that is called turgor pressure.
Answer
Answer: True.
Question 11.
Imbibition is a special type of diffusion when water is absorbed by solids-colloids-causing them to enormously increase in volume.
Answer
Answer: True.
Question 12.
The svmplast is the system of adjacent cell walls that is continuous throughout the plant, except at the apoplast strips of the endodermis in the roots.
Answer
Answer: False
Question 13.
The cortex is impervious to water because of a band of suberised matrix called the endodermis strip.
Answer
Answer: False.
Question 14.
Water is transient in plants. Less than 1% of the water reaching the leaves is used in photosynthesis and plant growth.
Answer
Answer: True.
Question 15.
Surface Tension- attraction of water molecules to polar surfaces (such as the surface of tracheary elements).
Answer
Answer: False.
IV. Match the items of column I with the items of column II
| Column I | Column II |
| (a) Pholem is responsible for | 1. is not dependent on a ‘living system’. |
| (b) Diffusion is a slow process and | 2. facilitated diffusion. |
| (c) In an antiport, they move in | 3. transport of food (primarily) sucrose from the source to the sink. |
| (d) Water potential is a concept | 4. opposite directions. |
| (e) Solute potential and pressure potential | 5. are the two main components that determine water potential. |
| (f) The net direction and rate of | 6. fundamental to understanding water movements. |
| (g) Membrane proteins provide sites at which such molecules cross the membrane. | 7. Osmosis depends on both the pressure gradient and concentration gradient. |
| (h) Cells swell in hypotonic solutions | 8. the cytoplasm to build up a pressure against the wall, that is called turgor pressure. |
| (i) Water diffuses into the cell causing | 9. casparian strips of the endodermis in the roots. |
| (j) The symplastic system is the | 10. and shrink in hypertonic ones. |
| (k) A mycorrhiza is symbiotic | 11. a modest push in the overall process of water transport. |
| (l) Root pressure can at best only provide | 12. system of interconnected protoplasts. |
| (m) In plants capillarity is aided by the direction of movement in the | 13. association of a fungus with a root system. |
| (n) Phloem can be upwards or | 14. i.e. bi-directional. |
| (o) The apoplast is the system of adjacent cell walls that is continuous throughout the plant, except at the | 15. the small diameter of the tracheary elements the tracheids and vessel elements |
Answer
Answer:
| Column I | Column II |
| (a) Pholem is responsible for | 3. transport of food (primarily) sucrose from the source to the sink. |
| (b) Diffusion is a slow process and | 1. is not dependent on a ‘living system’. |
| (c) In an antiport, they move in | 4. opposite directions. |
| (d) Water potential is a concept | 6. fundamental to understanding water movements. |
| (e) Solute potential and pressure potential | 5. are the two main components that determine water potential. |
| (f) The net direction and rate of | 7. Osmosis depends on both the pressure gradient and concentration gradient. |
| (g) Membrane proteins provide sites at which such molecules cross the membrane. | 2. facilitated diffusion. |
| (h) Cells swell in hypotonic solutions | 10. and shrink in hypertonic ones. |
| (i) Water diffuses into the cell causing | 8. the cytoplasm to build up a pressure against the wall, that is called turgor pressure. |
| (j) The symplastic system is the | 12. system of interconnected protoplasts. |
| (k) A mycorrhiza is symbiotic | 13. association of a fungus with a root system. |
| (l) Root pressure can at best only provide | 11. a modest push in the overall process of water transport. |
| (m) In plants capillarity is aided by the direction of movement in the | 15. the small diameter of the tracheary elements the tracheids and vessel elements |
| (n) Phloem can be upwards or | 14. i.e. bi-directional. |
| (o) The apoplast is the system of adjacent cell walls that is continuous throughout the plant, except at the | 9. casparian strips of the endodermis in the roots. |
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