explain the modification of stem of strawberry ,mint,pista,pineapple etc

The modification of stem in strawberry is stolon which is also known as runner. These are horizontally oriented stem that grow along the soil surface giving rise to roots and aerial branches.

The modification of stem in pistia is offset. It develops from the leaf axil that grows horizontally up to some extent. It bears a tuft of erect aerial leaves and adventitious roots towards the lower side.

The modification of stem in mint is sucker. It has leafy shoots, lateral branch arising close to the ground level, traveling underground for some distance, turning up at its end and producing a new plant.

The modification of stem in pineapples is offshoot. These are lateral branches on stems of monocots.