Q. No.Tensile strength is
(1) Mutual attraction between water molecules
(2) Attraction of water molecules to polar surfaces
(3) More attraction in water molecules in liquid phase than in gaseous phase
(4) An ability to resist a pulling force.
(1) Mutual attraction between water molecules
(2) Attraction of water molecules to polar surfaces
(3) More attraction in water molecules in liquid phase than in gaseous phase
(4) An ability to resist a pulling force.
Cohesion is
(1) Mutual attraction between water molecules
(2) Attraction of water molecules to polar surfaces
(3) More attraction in water molecules in liquid phase than in gaseous phase
(4) An ability to resist a pulling force.
Capillarity is not aided by
(1) Cohesion
(2) Adhesion
(3) Tensile strength
(4) Small diameters of the tracheary elements- the tracheids and vessels
The forces which are generated in xylem by transpiration pull can cause lifting of water up to
(1) 110 metres
(2) 13 metres
(3) 130 metres
(4) 19 metres
Evaporation from the leaf at first sets up a pressure gradient between the
(1) Outside air and cytoplasm of cells of leaf
(2) Outside air and air spaces of the leaf
(3) Outside air and xylem cells of the leaf
(4) Outside air and palisade cells of leaf
Which of the following is not a purpose of Transpiration?
1. Absorption of minerals and water from the soil and transport in the plants
2. Supplies water for photosynthesis
3. Evaporative heating
4. Maintains the shape and structure of the plants by keeping cells turgid
Transpiration can cool the leaf surface up to
(1) 10 to 15 degrees
(2) Up to 70 degrees
(3) Up to 2 degrees
(4) Up to 50 degrees
The humidity of rainforests is largely due to
(1) Guttation
(2) Transpiration
(3) Photosynthesis
(4) Respiration
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
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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