Question

A
B
Activity
Take two trays A and B of same
size. Make six holes in the end
of these trays and then fill
them with the same amount
of soil. Leave the soil in tray A
bare while grow grass in tray B.
When the grass in tray B has
grown few centimetres high,
place both the trays in such a
way that they are on a slope.
Pour one mug of water from the
same height into trays. Collect
the muddy water that trickles
down the holes of both trays
in two
separate containers
and compare how much soil
is washed out of each tray?​

Answer 1

Answer:

ஊழூழைழைபைழதைபமைஐழைமைழைழைழௌழூழைழை ஐஐழைப மைழி ஐழி

Answer 2

More soil will be washed away from tray A than tray B because:

• Tray A was left bare without any grass growing in it. Tray B had soil left to grow in it.
• Roots of all plants hold our soil in place and prevent soil erosion. They retain all the minerals and nutrients in the soil.
• Tray B had grass and its roots held the soil together. Tray A had no plant to hold the soil in place.
• When the trays were placed on the slope and water was poured in them, tray A would have had more soil in the water than tray B. This is due to the roots of the grass.
• In tray B, the grass held the soil together while not in tray A. So, more soil would be washed out from A than B.

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