Q. No.Girdling experiment suggests that
(1) Xylem is for water and mineral transport
(2) Phloem is for translocation of food
(3) Transport in phloem is multi directional as well
(4) The portion below the ring becomes swollen due to water
(1) Xylem is for water and mineral transport
(2) Phloem is for translocation of food
(3) Transport in phloem is multi directional as well
(4) The portion below the ring becomes swollen due to water
First sugar moves to
(At the time of loading of phloem)
(1) Companion cells
(2) Sieve tube cells
(3) Xylem vessels
(4) Phloem fiber
Facilitated transport differs from active transport as the former
1. Transports saturates.
2. Response to protein inhibitors.
3. Requires special membrane proteins.
4. Shows downhill transport.
Statement-1: Xylem transport can be unidirectional and bidirectional.
Statement-2: Both phloem loading and unloading is active process.
Options
1. Both statements are correct.
2. Both statements are incorrect.
3. 1 is correct, 2 is incorrect.
4. 1 is incorrect, 2 is correct.
Loss of water in liquid phase from the margin of leaves in many herbaceous plants is/occurs
1. Guttation
2. Transpiration
3. At noon
4. Due to cohesion-tension model of water movement.
The source and sink may be reversed
(1) Depending on the season
(2) Depending on the plant's needs
(3) Depending on the phloem type
(4) Both A and B
Which of the following is incorrect statement?
(1) An analysis of xylem exudate suggests that some of the nitrogen travels as inorganic ions and much of it is carried in the organic form as amino acids
(2) Small amount of P and S is also carried as inorganic compounds in xylem exudate
(3) There is exchange of material between xylem and phloem
(4) Xylem transports inorganic nutrients while phloem transports organic materials, this observation was proved wrong by the analysis of xylem exudate
Which of the following statements is not correct?
(1) Some ions also move in epidermal cells passively
(2) The active uptake of ions is partly responsible for the water potential gradient in the roots.
(3) Uptake of water by the roots is through osmosis
(4) Transport proteins of pericycle are control points where a plant adjusts the quantity and types of solute which will cross the cell membrane
Most of the minerals are absorbed through active transport because
(1) Minerals are charged particles
(2) Minerals are insoluble in lipid bilayer
(3) The amount of mineral is less in soil
(4) All of these
C4 plants are …….as efficient as C3 plants in term of making sugar and lose only ….. of the water in comparison.
(1) Half, double
(2) Twice, half
(3) One fourth, one third
(4) Twice, one third
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