Which of the following will not cause the stomata to close?

  • wilting

  • increase in carbon dioxide concentration

  • darkness

  • increase in pH

Pick the incorrect statement

  • Guard cells help balance the photosynthesis-transpiration compromise.

  • Water tension in a transpiring plant will exert a pull on water molecules lower down in the plant's vascular system.

  • Plants that live in deserts have adapted to constant water stress by using hydrophilic colloids to increase the water potential of their tissues.

  • C3 plants can fix double the carbon dioxide for half the water transpired.

What seems to be the most valid statement about root pressure?

  • It is the positive pressure responsible for transport of water most commonly.

  • It may provide a considerable push to the water column during transport.

  • It may help re establish the broken water columns during transpiration

  • Its effect is most observable during mid day

A structural attribute of guard cells that aid in its effective functioning is

  • Large cell size

  • Radial micellation in walls

  • Thick walls

  • All of the above

Not an aid to water absorption is

  • The high surface area of roots

  • High water potential of root hair cells

  • Thin cellulosic walls of root hair zone

  • Low concentration of solutes in the soil

The water is free to move between the cells except through the

  • xylem

  • epidermis

  • endodermis

  • pericycle

Continuity of protoplasm in sieve elements is maintained through

  • Cytoplasmic strands

  • P proteins

  • Vacuoles

  • Walls

Which is not an advantage of transpiration.

  • Maintains shape of cells by keeping them turgid

  • Cools down plant surfaces by evaporative cooling

  • Transports minerals.

  • None of the above.

One of the following is not a pre-requisite for transpiration?

  • high Vapour pressure deficit of atmosphere

  • Low atmospheric humidity

  • High soil water potential 

  • Sunny weather

A manifestation of root pressure is

  • Guttation

  • transpiration

  • Cohesion

  • Negative hydrostatic pressure

What is not a part of symplast?

  • Cell membrane

  • Cell wall

  • Tonoplast

  • Plasmodesmata

Mass flow seems to be the prominent mode of transport during

  • Translocation of organic solutes within phloem.

  • traslocation of water and minerals in xylem

  • Apolplastic movement of water in plants

  • All of the above

What is not a part of apoplast?

  • Intercellular spaces

  • Cell Walls

  • Sieve tubes

  • Vessels

Which is not an example of imbibition

  • Raisins soaked in water 

  • Wheat grains soaked in water

  • Gram seeds soaked in water

  • A piece of wood soaked in water.

When the cell is flaccid

  • Inflow and outflow of water is in equilibrium

  • Turgor pressure of the cell is 0

  • placed in isotonic solution

  • All of the above.

When a cell is plasmolysed what lies between the cell
wall and the cell membrane?

  • Water

  • Air

  • Nothing

  • Hypertonic solution

A value that is always negative in a cell is

  • Solute potential

  • Osmotic pressure

  • pressure potential

  • DPD

The main difference between active and passive transport across cell membrane is :

  • passive transport is non-selective whereas active transport is selective

  •  passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes.

  • passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel.

  • active transport occurs more rapidly than passive

Which of the following is not a feature of active transport of solutes in plants ?

  •  Occurs against concentration gradient

  •  Non-selective

  •  Occurs through membranes

  •  Requires ATP

What will be the direction of flow of water when a plant cell is placed in a Hypotonic solution?

  •  Water will flow in both directions.

  •  Water will flow out of the cell.

  •  Water will flow into the cell.

  •  No flow of water in any direction.

The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and early morning is:

  • Root pressure

  • Imbibition

  • Plasmolysis

  • Transpiration

Match List - I with List-II.

List-IList-II
(a) Cohesion
(b) Adhesion
(c) Surface tension
(d) Guttation

(i) More attraction in liquid phase
(ii)Mutual attraction among water molecules
(iii)Water loss in liquid phase
(iv) Attraction towards polar surfaces

Choose the correct answer from the options given below.

    (a) (b) (c) (d)

  • (iii) (i) (iv) (ii)

  • (ii) (i) (iv) (iii)

  • (ii) (iv) (i) (iii)

  • (iv) (iii) (ii) (i)

Active transport:
I. is the only means of uphill transport
II. requires ATP energy
  • Only I is true
  • Only II is true
  • Both I and II are true
  • Both I and II are false
Plasmolysis:
I. occurs when a plant cell [or tissue] is placed in a hypotonic solution.
II. water is first lost from the cytoplasm and then from the vacuole.
III. is usually reversible
  • Only I and II are correct
  • Only I and III are correct
  • Only II and III are correct
  • I, II and III are correct
Water has some important physical properties. Water molecules are attracted to each other in the liquid phase more than to water in the gas phase. This is called as:
  • Cohesion
  • Adhesion
  • Adnation
  • Surface tension
What is not true regarding diffusion in context of biology?
 
  • Molecules move in a random fashion with a net result that substance move from regions of higher concentration to regions of lower concentration.
  • No ATP energy expenditure takes place.
  • It is a very rapid process dependent on a living system.
  • It is the only means for gaseous transport in plant cells.
The innermost layer of the cortex in the roots that restricts the apoplastic transport of water inside is called as:
 
  • Hypodermis
  • Endodermis
  • Pericycle
  • Stele
What would be incorrect for phloem in angiosperms?
 
  • Phloem fibres, at maturity, lose their protoplasm and become dead.
  • The function of sieve tubes is controlled by the nucleus of companion cell.
  • The direction of movement in the phloem can be bi-directional.
  • Phloem sap is mainly water and starch.      
Apoplastic movement of water in plants:
  • involves crossing the cell membrane multiple times
  • is through mass flow
  • accounts for a very small fraction of water flow in roots
  • is relatively much slower than the symplastic flow
Identify the correct statement:
  • Unlike facilitated transport, simple diffusion requires special membrane proteins
  • Both simple diffusion and facilitated transport are highly selective
  • Facilitated transport is an uphill transport and requires ATP energy
  • Both facilitated transport and active transport are liable to saturate
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