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This set of Biology Multiple Choice Questions & Answers (MCQs) focuses on Transport in Plants Set 2
Q1 | Transpiration is unavoidable evil because of
- Structure of leaf and harmful effect
- Beneficial and harmful effect.
- Maintenance of turgidity for growth
- Gaseous exchange for photosynthesis and respiration
Q2 | Plants with scotoactive stomata perform
- C4 photosynthesi
- CAM photosynthesis
- C3 photosynthesis
- An oxygenic photosynthesis
Q3 | For keeping stomata open, besides K+ ions the guard cells require a constant supply of
- ABA
- ATP
- Organic acid
- Protons
Q4 | Transpiration is a process related to
- Osmosi
- Diffusion
- Activated transport
- Facilitated diffusion
Q5 | Rate of transpiration is inversely related to
- Humidity
- Light
- Temperature
- Water
Q6 | Scotoactive movement of stomata is that
- Stomata open at night
- Stomata open during day
- Stomata close at night
- Stomata open both during day and night
Q7 | The most effective light for stomatal opening is_____________
- Yellow
- Green
- Red
- Blue
Q8 | During high wind velocity, the stomata
- open more widely
- Close down
- Remian unaffected
- Remain unaffected but lose more water due to mass action
Q9 | Cobalt chloride is blue in dry state. In contact with moisture, it turns in to
- Yellow
- Pink
- Red
- Green
Q10 | The maximum absorption of water by roots occurs in the (region) zone of
- Root cap
- Cell division
- Cell elongation
- Root hairs
Q11 | The movement of water is along
- Turgor gradien
- DPD gradient
- Diffusion gradient
- Osmotic gradient
Q12 | As absorbed water passes towards vascular cylinder, it must enter the cytoplasm of
- Pericycle cell
- Endodermal cells
- Cortical cells
- Xylem parenchyma
Q13 | Water tightly held to soil particles is called (EAMCET 1996)
- Bound water
- Capillary water
- Hygroscopic water
- Runaway water
Q14 | The phenomenon which forces water upward into tracheal elements of xylem in the root region is
- Transpiration
- Root pressure
- Turgor pressure
- Imbibation pressure
Q15 | Force for passive water absorption develops in
- Xylem
- Aerial parts
- Root
- Root hairs
Q16 | The phenomenon related to active water absorption is
- Transpiration
- Root pressure
- Osmotic pressure
- Translocation
Q17 | Root pressure can be demonstrated by means of
- wilting
- Guttation
- Transpiration
- Exudation
Q18 | Root pressure theory of ascent of sap is unacceptable because
- Water can ascend without root or root pressure
- Root pressure cannot explain ascent of sap beyond 10 metres.
- Root pressure is more during early morning than afternoon.
- Root pressur does not occur in spring.
Q19 | Transpiration cohesion theory explains that the upwards pull of water is transmitted from top to bottom by cohesion of molecules caused by
- Hydrophilic cell wall
- Hydrogen bonds
- Oxygen bonds
- Surface tension
Q20 | Root pressure is unable to explain the ascent of sap because it is not found in
- Bryophyte
- All plants in all reasons
- Trees
- Spring
Q21 | Ascent of sap is
- Upward movement of water in the plant
- Downward movement of organic nutrients
- Upward and downward movement of water in the plant
- Redistribution of inorganic substances in the plant
Q22 | In xylem, the ascent of sap takes place in
- Tracheids with associated xylem parenchyma
- Xylem parenchyma
- Walls of tracheary elements
- Lumen of tracheary elements
Q23 | Swelling of wooden frames during rains is caused by
- Endo osmosi
- Imbibation
- Capillarity
- Osmosis
Q24 | Dry seeds when placed in waeter swell up due to
- Imbibition
- Absorption
- Diffusion
- Adsorption
Q25 | A cell is plasmolysed after being kept in hypertonic solution. What will be present between cell wall and plasmalemma ?
- Isotonic solution
- Hypertonic solution
- Air
- Hypotonic solution