Question

Closure of lid in Pitcher Plant is a
A) Tropic movement
B) Turgor movement
C) Paratonic movement
D) Autonomic movement

Answer 1

Hint:The scientific name of the pitcher plant is Nepenthes.Pitcher plant is an insectivorous plant.These plants have modified leaves called as pitfall traps.

Complete answer:
>Tropic movement :Tropic movement is the growth movement of plant in response to the stimulus present in the environment.It is specific to the direction of the stimulus.When the movement of plant take place towards the direction of the stimulus, then it is called as the positive tropism.And when the movement of plant take place away from the stimulus, then it is called as the negative tropism.
>Turgor movement : Turgor movement is the reversible change in the position of a plant part due to the change in the turgor pressure of various cells.It is due to the difference in the turgidity of the cells in the lower half and upper half of the petiole of leaf.
>Paratonic movement : Paratonic movement is the movement of a whole plant or the parts of the plant due to the influence of an external stimulus such as gravity, chemicals, heat or electricity.
>Autonomic movement : Autonomic movement is a kind of involuntary movement.This type of movement is independent of any kind of external stimuli.The closure of the pitcher plant is a type of autonomic movement. When the insects get attracted towards the pitcher plant and come close to these plants in order to get nectar, the lid of these plants get closed. In this way they trapped the insect into the pitcher which has some kind of sticky substance. As we have seen the closure of the lid is not influenced by any external stimuli like heat, wind, temperature, etc., So it is a type of autonomic movement.

Hence, option D is the correct answer.

Note:Insectivorous plants are the plants that colonise the area where there is lack of nitrogen in its soil. That’s why they digest insects and get nutrients from the organic matter of these insectivorous plants. They occupy the area where competition is minimal.