A potted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism.
(a) Name the part X of plant.
(b) Name the part Y of plant.
(c) Which part of the plant, X or Y, will exhibit positive hydrotropism?
(d) Which part of the plant, X or Y, can have tendrils on it?
(a) Roots show positive geotropism and grow in the direction of gravity. In soil, they grow towards dark hence, show negative phototropism.
(b) Stem or shoot shows positive phototropism and grows towards the light. They grow in opposite direction of gravity hence, show negative geotropism.
(c) The plant roots (Part X) always move towards water hence shows positive hydrotropism.
(d) Tendrils grow towards a stimulus (touch) and show directional movement and represent thigmotropism. Stem (Part Y) can have tendrils on it.