Questions
Common type of transpiration is ____________.
- stomatal
- culticular
- lenticular
- foliar
Maximum transpiration takes place from _____________________.
- stem
- leaves
- roots
- flowers and fruits
Transpiration pull will be maximum under which of the following conditions?
- Open stomata, high humid atmosphere and well irrigated soil
- Open stomata, high humidity in atmosphere and dry soil
- Open stomata, dry atmosphere and moist soil
- Closed stomata, dry atmosphere and dry soil
The rate of transpiration during a stormy and cloudy day is _________.
- very high
- high
- low
- nil
Stomata controls the exchange of ________.
- water vapours only
- water vapours and CO2
- CO2 only
- N2 and CO2
The loss of water in the form of water vapours from the exposed aerial parts of the plant is known as _____________.
- evaporation
- guttation
- transpiration
- bleeding
Which of the following is the most likely cause for wider opening of stomata?
- When the atmosphere is less saturated.
- When suction of salt molecules by adjacent guard cells takes place.
- When water molecules enter the guard cells.
- When the night temperature falls.
Water lost in transpiration is _____.
- pure water
- rich in dissolved salts
- rich in dissolved minerals
- rich in solutes
Which of the following is a correct statement?
- Transpiration is partly physical and partly physiological process.
- Transpiration is influenced by only environmental conditions.
- Transpiration depends upon absorption of water and does not use energy.
- Transpiration is a rapid biological process.
Which of the following epistomatous leaves would dry up last?
- Leaves with both surfaces ungreased
- Leaves with both surfaces greased
- Leaves with upper surface greased
- Leaves with lower surface greased
Stomata in submerged plants are _______.
- present but not functional
- absent
- present only in very few numbers
- present on both sides
The rate of transpiration decreases with increase in ___________.
- wind
- width of stomatal pores
- temperature
- humidity
The most effective light for stomatal opening is _________.
- green
- yellow
- blue
- red
Presence of stomata on the undersurface of dorsiventral leaf will ________.
- reduce the rate of transpiration
- properly regulate the transpiration
- protect the leaf from dust
- increase the rate of transpiration
Transpiration is mainly a process of ___________.
- osmotic potential
- imbibition
- diffusion
- respiration