Question

Movement of Indian telegraph plant is

• A. Turgor movement
• B. Geotropism
• C. Phototropism
• D. Cyclosis

Answer 1

The correct option is A Turgor movement

Turgor growth movements are types of movements brought about by changes in turgor pressure of the cells, causing the movement. These may be divided into two types-
(i) Autonomous or spontaneous and
(ii) Paratonic or induced.
Autonomous turgor movements do not require any stimulus and are observed in the Indian telegraphic plant - Desmodium gyrans.

Here the compound leaf shows three leaflets, one terminal large leaflet and two very small lateral, opposite leaflets. The two lateral leaflets show rhythmic movements during the day. These move up, then move back, and then move down finally back to the original position. This type of movement is due to variation or change in the turgor pressure at the base of the stalk of each leaflet.