Question

Immediate response to stimulus is shown by which of the following plants?
A) Mimosa plant
B) Tulsi plant
C) Neem plant
D) Rose plant

Answer 1

Hint: As specialized cells in root caps detect and react to gravity, plant roots often grow downwards. This is an instance of tropism.

Complete Answer:
In their environment, plants sense and react to stimuli. Typically, they are anchored to the earth. Alternatively, a plant's primary means of reaction is to alter how it grows. In order to regulate their reactions, plants often do not have a nervous system. Instead, hormones, which are molecular messenger molecules, usually regulate their reactions.

Now, let us find the solution from the options-
- The touch-me-not plant is called Mimosa pudica. As a reaction to touch or a related stimulus, it wilts. As a consequence of the outward flow of water, the leaves wilt. A sensation, such as a touch, allows chemicals to be released in some regions of the stem, allowing water to transfer from cell vacuoles to intercellular space, which contributes to cell shrinkage.
- In reaction to contact with a firm touch, the motion of the plant component is termed thigmotropism. An instance of thigmotropism is the twining motions attributable to help found in twiners and tendrils. Thus option B is not the correct option.
- The rate of growth is slower on the side of the stem that is being touched than on the side opposing the contact. The resulting pattern of creation is to bind and occasionally coil around the entity that touches the plant. Thus option C is not the correct option.
- Roses originate from the northern hemisphere and are mainly grown in temperate zones. Thus, option D is not the correct option.

Thus, the correct answer is option (A) Mimosa plant.

Note: It has also been found that the plant growth hormone auxin is involved in Thigmotropism activity in plants, but its function is not well known. Instead of the asymmetric distribution of auxin impacting other tropisms, with a symmetric distribution of auxin, a unidirectional Thigmotropism reaction may occur.