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

Subtopic:  Photosynthesis Transpiration Compromise & Mineral Translocation |
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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

Subtopic:  Photosynthesis Transpiration Compromise & Mineral Translocation |
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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

Subtopic:  Water Absorption |
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What is the chief sink of mineral elements in plants?

(1) Growing regions of the plant

(2) Enlarged cells

(3) Soil

(4) Root hair

Subtopic:  Photosynthesis Transpiration Compromise & Mineral Translocation |
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The most readily mobilised elements from older dying leaves are

(1) P,K

(2) S,N

(3) N

(4) All of these

Subtopic:  Photosynthesis Transpiration Compromise & Mineral Translocation |
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Which of the following is a part of structure and is not remobilised?

(1) K

(2) N

(3) Ca

(4) S

Subtopic:  Photosynthesis Transpiration Compromise & Mineral Translocation |
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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

Subtopic:  Photosynthesis Transpiration Compromise & Mineral Translocation |
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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

Subtopic:  Ascent of Sap |
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Phloem sap is mainly

(1) Water and minerals

(2) Water and sucrose

(3) Hormones and amino acid

(4) Hormones and water

Subtopic:  Ascent of Sap |
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Which of the following is an accepted mechanism for translocation of sugars from source to sink?

(1) Cohesion Flow hypothesis

(2) Pressure Flow hypothesis

(3) Mass fusion hypothesis

(4) Tension flow hypothesis

Subtopic:  Phloem Translocation |
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