(i) Epidermis protects the inner plant cells from external injury and adversity.
(ii) The skin stops water loss. Cutin, silica and wax reduce the rate of skin absorption.
(iii) Poison glands protect against animal attacks.
(iv) Stomata present in leaves allow exchange of gaseous substances.
(v) Rhizomes absorb water and mineral salts.
(vi) Skin containing chloroplasts produces food.
(vii) Skin cells divide and heal wounds.
(viii) Bulliform cells store water.
(ix) It stores water and waste matter.
(x) The waxy layer of the skin resists fungal attack.