SSC
BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
It cools leaves and helps move water up the plant.
|
|
|
It makes the plant wilt
|
|
|
It helps the plant to respire
|
|
|
None of the above
|
Detailed explanation-1: -Transpiration serves to evaporatively cool plants, as the evaporating water carries away heat energy due to its large latent heat of vaporization of 2260 kJ per liter. More leaves (or spines, or other photosynthesizing organs) means a bigger surface area and more stomata for gaseous exchange.
Detailed explanation-2: -Evaporation from the mesophyll cells produces a negative water potential gradient that causes water to move upwards from the roots through the xylem. Inside the leaf at the cellular level, water on the surface of mesophyll cells saturates the cellulose microfibrils of the primary cell wall.
Detailed explanation-3: -Transpiration occurs when plants take up liquid water from the soil and release water vapor into the air from their leaves.