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Dispersion forces are weak attractive forces are important only over extremely short distances because they vary as

Name one device that can be used by short statured person to see over the head of a crowd.

Assertion : Water hyacinth is an invasive aquatic plant which speads all over the water in a short period of time. Reason : Water hyacinth can reproduce vegetatively.

Assertion: Water hyacinth spread all over the water body in a short period of time and it is very difficult to get rid of them. Reason: Water hyacinth propagate vegetatively at a phenomenal rate.