The evolution of C4 plants is probably one of the strategies to

(1) Maximize oxygen availability

(2) Maximize Carbon dioxide availability

(3) Minimize water loss

(4) Both B and C

(1) Half, double

(2) Twice, half

(3) One fourth, one third

(4) Twice, one third

(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

(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

(1) Endodermis

(2) Pericycle

(3) Epidermis

(4) Cortical cell

(1) Growing regions of the plant

(2) Enlarged cells

(3) Soil

(4) Root hair

(1) Storage organs

(2) Developing flowers, fruits and seeds

(3) Young leaves

(4) Senescent part

(1) P,K

(2) S,N

(3) N

(4) All of these

(1) K

(2) N

(3) Ca

(4) S

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 the xylem and phloem.

4. Xylem transports inorganic nutrients while phloem transports organic materials, this observation was proved wrong by the analysis of xylem exudate.