17.Cuticle retards water loss through
1.Passage cells
2. Parenchyma cells
3.Epidermal cells
4.Mesophyll cells
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19.A large quantity of transpirational water loss occurs through
1.Stomata
2.Cuticular
3.Lenticular
4.Hydathodes
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20.The water vapour accumulates in the intercellular spaces creating a concentration gradient between
1.Atmospheric air and intercellular spaces of leaves
2.Atmospheric air and extracellular spaces of leaves
3.Atmospheric air and intercellular spaces of roots
4.Atmospheric air and intercellular spaces of stems
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Accumulation K ions are enhances in the presence of
1. temperature
2.Light
3. Water
4.Oxygen
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An ideal condition for transpiration in leaves depends on
1.Thin walls of mesophyll cells
2.Large number stomata
3.Large intercellular spaces
4.All the three
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An inverted h shaped three limbed tube is used
1.To measure the rate of transpiration
2.To demonstrate transpiration pull
3.To demonstrate liberation CO? during respiration
4.To demonstrate that O? is evolved during photo synthesis
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Differences in water potentials of the guard cells are caused by accumulation or loss of
1.Ca?? ions
2. K? ions
3.Cl? ions
4.Mg?? ions
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Due to differences in water potentials of the guard cells darkness promotes the loss of
1. K? ions
2. Ca?? ions
3. Cl? ions
4.Mg?? ions
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Escape of water vapour from leaves takes place through
1.Lenticels
2.Stomata
3.Cuticle
4. Epidermal cells
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Excess thermal energy is disposed by the plants
1.Respiration
2.Transpiration
3.Photosynthesis
4.Guttation
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Guttation liquid is
1. Pure water
2. Pure solvent
3. Not pure water
4. Not pure solvent
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In woody plants the bark tissue contain
1.Guard cells
2.Stomata
3.Lenticels
4.Epidermal cells
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Leaf surface is coded by the process of
1.Guttation
2.Respiration
3.Photosynthesis
4.Transpiration
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Loss of water in a liquid form along the margins of leaves is known as
1.Guttation
2. Transpiration
3.Photosynthesis
4. Respiration
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Loss of water in the guard cells makes them
1.Turgid
2.Flaccid
3.Cupid
4.Rigid
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Minute pores surrounded by two guard cells found on epidermis are called
1. Guard cells
2.Stomata
3.Lenticels
4.Epidermal cells
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Photosynthetic carbon assimilation in guard cells is related to
1.Cuticular movement
2.Stomatal movement
3.Lenticular movement
4.Guttation
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Relative density of mercury is
1.3.6 gms
2. 13.6 gms
3. 90 gms
4. 96.4 gms
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Stomata open and close due to changes in the guard cells by
1.Osmotic pressure
2. Root pressure
3. Turgor pressure
4. Capillary pressure
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The amount of absorbed water lost by plants in the form of vapour is
1.10%
2.50%
3.80%
4.90%
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The apparatus used to measure the rate off transpiration isGanong s light screen
1.Ganong s respiroscope
2.Ganong s photometer
3.Ganong s light screen
4.Thistle funnel
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The entry of water from adjacent cells to guard cells is caused by the differences in water potential of their Opt 1 : Protoplasts
1.Chloroplasts
2.Plastids
3.Carotenoids
4.rotoplasts
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The entry of water from adjacent cells to guard cells or vice versa is caused by the differences in
1.Osmosis
2.Diffusion
3.Water potential
4.Imbibition
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The entry of water makes guard cells as
1.Turgid
2.Flaccid
3.Rigid
4.Cupid
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The escape of water vapour from leaves through stomata by diffusion is caused by
1.Active transport
2.Concentration gradient
3.Osmosis
4.Guttation
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The humidity in atmosphere affects
1.respiration
2.transpiration
3.growth
4.photosynthesis
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The ideal material for the disposal of solar energy from the plants is
1. Water
2. K? ions
3.Organic compounds
4. Pectic substances
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The internal temperature of the plant cells become uniform and constant by
1.Photosynthesis
2.Respiration
3. Transpiration
4.Guttation
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The stoma is open when the guard cells are
1.Flaccid
2.Rigid
3.Turgid
4.Cupid
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The type of transpiration which is insignificant as compared to stomatal transpiration
1.Cuticular
2.Lenticular
3.Guttation
4.Hydathodes
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This is not a type of transpiration
1.Stomatal
2.Cuticular
3.Lenticular
4.Guttation
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Transpiration helps in absorption and translocation of mineral salts by means of the
1.Push and pull force
2.Pull and capillary force
3.Push and suction force
4.Pull and suction force
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Transpiration through lenticels is called
1.Stomatal
2.Lenticular
3.Cuticular
4. Guttation
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Water is translocated through xylem tissue to the
1.Mesophyll cells of leaves
2.Epidermal cells of leaves
3.Passage cells of roots
4.Parenchymal cells of stems
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Water potential of the guard cells during day time is
1.High
2.Very high
3. Low
4. Very low
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Water potential of the guard cells during night time isLow
1.Low
2.very low
3. High
4.vary high
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Water vapour is escaped from leaves through stomata by
1.Osmosis
2. Guttation
3. Diffusion
4. Capillary force
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When guard cells are flaccid the stoma is
1.Closed
2.Opened
3.Broadenced
4.Narrowed
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