Page 209 - Primary Six Notes

Sweet potato root tuber is a swollen adventitious roots which

develop from a node of creeping sweet potato

stem.

The adventitious ii roots become swollen because it

stores n food mainly starch

in 9 ■*

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Osmosis

This is the movement of water molecules from a region of low

water concentration to a region of high water concentration

through semi permeable membrane.

Importance of osmosis

Osmosis helps plants to absorb water and mineral salts from

the soil.

Osmosis enables water to move from the soil to the roots up to
the leaves with the help of capillary attraction.

Capillary attraction is the force that enables water molecules

to rise from a region of lower concentration to a region of

higher concentration.