Transpiration (AIPVT)
Questions about transpiration in plants, including types of transpiration (foliar, lenticular, cauline), stomatal structure and function, factors affecting transpiration rate, stomatal opening/closing mechanisms, anti-transpirants, and measurement techniques.
Questions
Alfaalfa type of stomata are present in
- onions
- radish
- pumpkin
- moong
Cauline transpiration takes place from the
- leaves
- stem
- calyx
- buds
Most of the transpiration which takes place in plants is called
- cuticular transpiration
- lenticular transpiration
- foliar transpiration
- cauline transpiration
Which of the following factors increases the rate of transpiration?
- Darkness
- Low temperature
- Humid air
- Dry air
In which of the following plants are stomata open throughout day and night, except for a few hours in the evening?
- Bean and pea
- Cabbage and pumpkin
- Cereals
- Onion and mustard
What happens when sugar gets converted to starch in leaves?
- Stomata are partially opened.
- Stomata are closed.
- Stomata are fully opened.
- Stomata remain unchanged.
Which of the following enzymes is responsible for closing of stomata?
- Phosphoglucomutase
- Phosphorylase
- Hexokinase
- Phosphatase
Which of the following statements are untrue?
- Transpiration is regulated by guard cells.
- Transpiration stops when air is fully saturated.
- Transpiration is dependent upon absorption of water from the soil.
- Transpiration takes place from aerial parts of the plant.
Lenticular transpiration takes place through
- flowers
- tendrils
- fruits
- green stems
What is the action spectrum of transpiration?
- Orange-Red
- Blue and Red
- Blue and green
- Green - UV light
In guttation, water exits from the plant through
- lenticels
- hydathodes
- stomata
- pits
Transpiration is reduced when
- atmospheric pressure is lowered
- soil contains higher concentration of salts
- abundant light is present
- atmosphere is less humid
The inner wall of guard cell is
- thicker than the outer wall
- thinner than the outer wall
- of same thickness as the outer wall
- Absent
Stomata opens wide when
- atmosphere outside the stomata is less saturated
- secretion of salt molecules by the adjacent guard cells takes place
- water molecules enter the guard cells
- there is sudden fall of temperature
Who proposed the proton transport method for opening and closing of stomata?
- Health and Zelitsh
- Levitt
- Von Mohl
- Lloyd
Stomata opens in night and closes during day in
- Pine
- Water lily
- Aloe vera
- Clover
Which of the following hormones is/are produced by plants during water stress that brings stomatal closure?
- Auxins
- Abscisic acid
- Ferulic acid
- Resins
'Transpiration is a necessary evil' was promulgated by
- Von Mohl
- Curtis
- Steward
- Hanes
Cobalt chloride experiment is used
- to demonstrate the process of transpiration
- to determine the rate of transpiration
- to show that the rate of transpiration from the lower surface of leaf is higher than the upper surface
- to demonstrate the phenomenon of osmosis
According to Von Mohl,
- starch to sugar inter-conversion regulates stomatal opening or closing
- osmotic pressure regulates the stomatal opening and closing
- opening and closing of stomata takes place by an active transport of K+ ions into the guard cells
- transpiration pull regulates stomatal opening or closing
Which of the following is a metabolite anti-transpirant?
- Low viscosity waxes
- Silicon emulsion
- Abscisic acid
- Fertilizers in soil
What is/are epithem?
- Epithem are the kidney shaped cells regulating the opening and closing of stomatal aperture.
- Epithem are the epidermal cells surrounding the guard cells.
- Epithem are the loose tissues present below hydathodes.
- Epithem is the watery sap secreted from injured or cut plant.
Which of the following phenomenon takes place only at night?
- Transpiration
- Guttation
- Evaporation
- Bleeding
Which phenomenon governs the transpiration in plants?
- Gravity
- Electrical charges on leaves
- Capillary action
- All of the above
Plant bleeding refers to
- secretion of red liquid from cuts in plant
- secretion of watery sap from injured plant
- exudation of water in the form of droplets from the margin of leaves
- excessive loss of water from the plants leading to water deficit
Which enzyme catalyzes the conversion of starch to sugar leading to opening of stomata?
- Hexokinase
- Phosphatase
- Phosphoglucomutase
- Phosphorylase
Which instrument measures both relative humidity and transpiration?
- Porometer
- Potometer
- Psychrometer
- Tensiometer
An increase in root/shoot ratio results in
- increase in rate of transpiration.
- decrease in rate of transpiration
- increase in rate of absorption
- increase the rate of photosynthesis