Observations

These are the things I have also observed in the growth of the seeds:

The Stems are thin and weak

The stems of all the plants are very thin and tall. In fact, they are so thin that the plant could not stand upright by itself very well. It leans to one side of the bag. I think this happen because I used water to grow the plants and not soil. So the plants do not have extra nutrients that they can get from the soil to make it stronger, and also the roots does not have anything to hold on to, to help the plant stand firm.

A plant with big seed seems to be stronger

Of all the seeds, the Maha Bodhi seed and the Kidney Beans grew into plants with the strongest stems. They are also the slowest to grow their first leaves, but once that happen, they grow very quickly and heathily.

I read the internet and some scientist says that the reason bigger seeds tend to grow into stronger plants is because they have more stored food in their cotyledons (or seed leaves). They also tend to have stronger and better formed embryos.

Roots will always grow downwards to the water, and Shoots upwards to the Sun

In the beginning, when the roots of all the seeds appeared, they were pointing upwards. However, after 1 to 2 days, the roots are observed to turn themselves downwards, towards where the water is. This is what killed my Black-eye beans. While the roots was trying to turn down towards the water, it could not find a space between the staplers and the roots got crushed. :-(

By the time the shoots start to grow, the roots are facing the right direction - downwards. So the shoots have no problem growing upwards towards the Sun.

It is very hard for a plant to grow into a healthy mature plant if it is grown in only water

All the stems of the plants are skinny and long. They are not strong and tend to lean towards one side. The Maha Bodhi plant twines itself around my window grill to lift itself upright.

For the Green Bean plant, it is worst. After growing very quickly in the beginning, it stopped growing totally after a few days! The seedleaves dried up as its food has been used up by the plant, even before True Leaves appeared. My mother says that for the Green Bean Plant to survive, we should replant it into a pot with soil. The slow release fertiliser is not enough to keep the plant healthy and alive for long.