Transpiration in Plants

The video explains transpiration, a process where plants lose water as vapor. It covers the types of transpiration, its link to photosynthesis, and factors affecting it. An experiment using cobalt chloride paper demonstrates stomatal transpiration, showing that the lower surface of dicot leaves transpires faster than the upper surface.

What is the primary form in which water is lost from plants during transpiration?

• Dew

• Ice

• Water vapor

• Liquid water

Which type of transpiration is most commonly associated with the loss of water through stomata?

• Cuticular transpiration

• Lenticular transpiration

• Bark transpiration

• Stomatal transpiration

Why is transpiration considered a 'necessary evil' in plants?

• It causes plants to grow too quickly.

• It leads to excessive water loss but is essential for photosynthesis.

• It prevents plants from absorbing sunlight.

• It stops the movement of nutrients.

Which external factor does NOT affect the rate of transpiration?

• Light intensity

• Atmospheric temperature

• Wind

• Soil type

What is the role of stomata in the process of transpiration?

• They release oxygen into the atmosphere.

• They allow water vapor to escape from the leaf.

• They absorb nutrients from the soil.

• They prevent water loss from the leaf.

What is the purpose of using cobalt chloride paper in the experiment?

• To detect the presence of water vapor

• To measure the temperature of the leaf

• To absorb sunlight

• To provide nutrients to the leaf

What color change indicates the presence of water vapor in the experiment?

• Blue to green

• Blue to pink

• Pink to yellow

• Pink to blue

In the experiment, which surface of a dicot leaf shows a faster rate of transpiration?

• Neither surface

• Upper surface

• Both surfaces equally

• Lower surface

What conclusion can be drawn about transpiration rates in dicot leaves?

• Transpiration does not occur in dicot leaves.

• Transpiration is faster on the upper surface.

• Transpiration is faster on the lower surface.

• Transpiration rates are equal on both surfaces.

How does the rate of transpiration vary among different plant species?

• It is the same for all species.

• It is faster in dicots only.

• It varies across species and between dicots and monocots.

• It is faster in monocots only.