Question

Give suitable explanation

a) More transpiration occurs from lower surface of a dorsiventral leaf

b) Endodermis takes part in preventing water loss from the stele.​

Answer 1

Answer:

A.More transpiration occurs in lower surface of dorsiventral leaf because the number of stomata present in the ventral side of the leaf is more than the number of stomata present in the dorsal side of leaf.

B. The inner most part of the cortex in root and dicot stem is endodermis. it is single layered. Cells are barrel shaped and thick walled. On the radial walls and tangential walls, ligno suberised thickenings are present. These are called Casparian thickenings. Some of the endodermal cells lack casparian bands. These are called passage cells. These cells are present opposite to the protoxylem cells. Endodermis acts as check point, and prevents the outflow of water and minerals from the stele into cortex, and also acts as a barrier in the inflow of water and minreral from cortex and stele.

Answer 2

Answer A) More transpiration occurs from the lower surface of a dorsiventral leaf. There are more stomatal openings on the lower surface of a dorsiventral leaf and therefore, more transpiration occurs from the lower surface.


Answer B) The inner most part of the cortex in root and dicot stem is endodermis. it is single layered. Cells are barrel shaped and thick walled. On the radial walls and tangential walls, ligno suberised thickenings are present. These are called Casparian thickenings. Some of the endodermal cells lack casparian bands. These are called passage cells. These cells are present opposite to the protoxylem cells. Endodermis acts as check point, and prevents the outflow of water and minerals from the stele into cortex, and also acts as a barrier in the inflow of water and minreral from cortex and stele.
So, the correct option is 'preventing water loss from stele'


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