Explain why in the morning plant leaves are moisten​

It occurs when there is active absorption of water by roots and transpiration is low i.e. moist and humid conditions. Therefore, guttation generally occurs in the early morning because transpiration is less at that time but water is actively absorbed by the roots.

That is because as the temperature drops during night

the water vapour gets converted to water droplets which moisten leaves

but there is no

i guess you forgot putting it.

answer; both surfaces of the membrane are nonpermeable