CBSE Class 11 Biology VBQs Transport In Plants

Questions :

1. Why during the rainy season the doors and windows are difficult to close and open. Give the phenomenon behind this, give its definition.

Ans1. The phenomenon is "Imbibition". In which a special type of diffusion occurs where the water is absorbed by the solids and increase their volume.

2. During making of pickles in home high salt concentration is applied. Why? Name the phenomenon.

Ans2. High salt concentration is applied to extract the extra water from the vegetables and inhibit the growth of microorganisms. The phenomenon is known as exosmosis.

Ques. Which of the following is not a feature of active transport of solutes in plants ?
(a) Occurs against concentration gradient
(b) Non-selective
(c) Occurs through membranes
(d) Requires ATP 

Answer: B

Ques. Which of the following criteria does not pertain to facilitated transport?
(a) Transport saturation
(b) Uphill transport
(c) Requirement of special membrane proteins
(d) High selectivity

Answer: B

Ques. The movement of ions against the concentration gradient will be
(a) active transport (b) osmosis
(c) diffusion (d) all of the above.

Answer: A

Ques. What will be the direction of flow of water when a plant cell is placed in a hypotonic solution ?
(a) Water will flow in both directions.
(b) Water will flow out of the cell.
(c) Water will flow into the cell.
(d) No flow of water in any direction.

Answer: C

Ques. The water potential of pure water is
(a) less than zero
(b) more than zero but less than one
(c) more than one
(d) zero. 

Answer: D

Ques. Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be
(a) no movement of water
(b) equilibrium between the two
(c) movement of water from cell A to B
(d) movement of water from cell B to A. 

Answer: C

Ques. The water potential and osmotic potential of pure water are
(a) 100 and 200 (b) zero and 100
(c) 100 and zero (d) zero and zero.

Answer: D

Ques. When a cell is fully turgid, which of the following will be zero?
(a) Turgor pressure (b) Water potential
(c) Wall pressure (d) Osmotic pressure

Answer: B

Ques. With an increase in the turgidity of a cell, the wall pressure will
(a) fluctuate (b) remain unchanged
(c) increase (d) decrease. 

Answer: C

Ques. Water movement between cells is due to
(a) T.P.
(b) W.P.
(c) D.P.D.
(d) incipient plasmolysis. 

Answer: C

Ques. A bottle filled with previously moistened mustard seeds and water was screw capped tightly and kept in a corner. It blew up suddenly after about half an hour. The phenomenon involved is
(a) diffusion (b) imbibition
(c) osmosis (d) DPD. 

Answer: B

Ques. Water potential is equal to
(a) Ψs + O.P (b) Ψs = T.P
(c) Ψp + Ψw (d) Ψs + Ψp.  

Answer: D

Ques. The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is
(a) transpiration (b) root pressure
(c) imbibition (d) plasmolysis.

Answer: B

QuesTransport in Plants
(a) water, mineral salts, some organic nitrogen and hormones
(b) water only
(c) water and mineral salts only
(d) water, mineral salts and some organic nitrogen only. 

Answer: A

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

Answer: B

Ques. In soil, water available for plants is
(a) gravitational water
(b) chemically bound water
(c) capillary water
(d) hygroscopic water. 

Answer: C

Ques. The movement of water, from one cell of cortex to adjacent one in roots, is due to
(a) accumulation of inorganic salts in the cells
(b) accumulation of organic compounds in the cells
(c) water potential gradient
(d) chemical potential gradient. 

Answer: C

Ques. Guttation is mainly due to
(a) root pressure (b) osmosis
(c) transpiration (d) imbibition.

Answer: A

Ques. In soil, the water available for root absorption is
(a) gravitational water (b) capillary water
(c) hygroscopic water (d) combined water

Answer: B