Question

The closure of lid of pitcher in pitcher plant is

• A. A paratonic movement
• B. A tropic movement
• C. A turgor movement
• D. An autonomous movement

Answer 1

The correct option is A A paratonic movement

The leaf lamina and apex of pitcher plant form pitcher and lid respectively. The coloured lid and nectar attract the insects which are then drowned into acidic fluid of pitcher present at it bottom. Sitting of insects stimulates the closing of lid of pitcher which makes it an induced/paratonic movement. The vital movements of plant parts which are induced by any external factor (light, temperature, water etc) are known as induced or paratonic movements as opposed to the autonomic/spontaneous movements. Thus, option A is correct.