00:02
So here we have been told that the movement of water through vascular plant is important for their survival.
00:09
Now, the first question is asking us to explain the mechanism of water movement through the vascular plants.
00:23
And this explanation should include a discussion of how the anatomy of vascular plants and the property of water contribute to this process.
00:35
So we know that unlike animals, plant lack a metabolically active pump like the heart to move fluid in their vascular system.
00:46
Now instead, water movement is passive or we can say passively driven by pressure and also by chemical gradient.
01:08
The bulk of water which is absorbed and transported through plant is moved by negative.
01:14
Pressure which is generated with the help of evaporation of water from their leaves and this process is known as transpiration.
01:29
Also, we hold this mechanism of transporting water and using the help of gradients or the evaporation method, all of them are known as cohesion, tension, mechanism and this system is able to function because water is cohesive in nature and it sticks to itself through forces which is generated by the hydrogen bonding this hydrogen bond allow the water columns in the plant to sustain substantial tension and the tension part of the ct mechanism is generated by the the help of transpiration.
02:38
Also evaporation which occurs inside the leaves, these occur predominantly from the damp cell ball surface which is surrounded by a network of air spaces.
02:49
Now we can say that when salute movement that is restricted because of the semi -perneable membrane then there is this water movement across the semi -permeable membrane also because we know that water is that substance which can move across any membrane and this movement occurs via a process which is called as osmosis and this osmosis plays a central role in the movement of water between cells and that of various compartments which are present in the plant.
03:47
In the absence of transpiration, osmotic forces dominate the movement of water into the root.
03:54
This manifests as root pressure and gutation.
04:06
This is also another forces which act during the mechanism of water movement across the whole plant.
04:15
And this is commonly seen in lawn grasses where water droplets formed at leaf margins in the morning after conditions of low evaporation.
04:25
Also, root pressure results when tally accumulate to a greater concentration in the root xylem than compared to the other root tissues.
04:36
The resultant chemical potential gradient dried water influx across the root and into the xylum.
04:43
And no root pressure exist in rapidly transpiring plants.
04:49
So this was the whole mechanism we could say for the movement of water in vascular plants...