Questions
Which of the following is NOT the site for transpiration?
- Stomata
- Surface stems
- Roots
- Lenticels
Which of the following is the process through which water from the aerial parts of the plant is lost?
- Respiration
- Photosynthesis
- Transpiration
- Guttation
Which of the following is the major site for transpiration?
- Stomata
- Surface of branches
- Lenticels
- Cuticle of stem
Which of the following is the major site for transpiration in a dicot plant?
- Stem lenticels
- Stem cuticle
- Upper surface of leaf
- Under surface of leaf
Which of the following, when increases, does not increase the rate of transpiration?
- Intensity of sunlight
- Temperature
- Humidity
- Velocity of wind
Which of the following regulates the opening and closing of lenticels?
- Turgidity and flaccidity of guard cells
- Turgidity and flaccidity of epidermal cells
- Amount of water in the surrounding cells
- It is unregulated and remains open.
Where are lenticels located in plants?
- Undersurface of leaf
- Root hair
- Flowers
- Older stem
Which of the following is the increasing order for rate of transpiration?
- Cuticular transpiration - Lenticular transpiration - Stomatal transpiration
- Lenticular transpiration - Cuticular transpiration - Stomatal transpiration
- Stomatal transpiration - Lenticular transpiration - Cuticular transpiration
- Stomatal transpiration - Cuticular transpiration - Lenticular transpiration
Which of the following statements is NOT true?
- Transpiration is reduced on a cloudy day.
- Transpiration is not affected by sunlight.
- Stomatal transpiration does not occur at night.
- Rate of transpiration is higher during the day.
Which of the following statements is NOT true?
- If velocity of wind is high, more transpiration occurs.
- If outside temperature is low, more transpiration occurs.
- Warm air holds more water allowing more transpiration.
- Cold air holds less water allowing less transpiration.
Which of the following results in wilting of leaves of some plants during mid-day?
- Absorption of water exceeding rate of transpiration
- Rate of transpiration exceeding absorption of water
- Rate of photosynthesis exceeding rate of transpiration
- Rate of transpiration exceeding rate of photosynthesis
Which of the following processes results in movement of water vapours from the surface of cell to the outside atmosphere?
- Imbibition
- Diffusion
- Exosmosis
- Active transport
Which of the following statements is NOT true?
- Cuticle is secreted by epidermis.
- Desert plants tend to have thicker cuticle.
- Thickness of cuticle is directly proportional to rate of transpiration.
- Thickness of cuticle varies from plant to plant.
Which of the following factors does NOT affect the rate of transpiration?
- CO2 content of air
- Water content of air
- Oxygen content of air
- Atmospheric pressure
Which of the following adaptations could be found in plants growing in dry climate?
(i) Sunken stomata
(ii) More stomata
(iii) Fewer stomata
(iv) Wide stomata
- Both (i) and (ii)
- Both (ii) and (iv)
- Both (i) and (iii)
- Both (i) and (iv)