Question

Plants with weak stems like in a cucumber and bitter gourd show
A) Phototropism
B) Thigmotropism
C) Geotropism
D) Chemotropism

Answer 1

Hint: Normally, tropisms are associated with plants. Where an animal is capable of specific physical action (motility), behaviourists are more likely to regard action or activity as a taxis (directional response) or kinesis (non-directional response) in response to a particular stimulus.

Complete Answer:
When it is activated by an environmental cause, a tropism is a growth reaction that a plant undergoes. Stimulations that may cause tropisms in a plant are environmental influences, including sunlight, chemical nutrients, gravity, and water. As hormones within the stem, leaf systems and root in a plant assist in the elongation and development phase of the plant towards the stimuli, the plant develops in the direction of the stimulus.

Now, let us find the solution from the options-
- The stem is very small and slender of the plants such as cucumber and bitter gourd.
-The property of thigmotropism is seen by the stem. This is a process in which the stretching or curling of the stem is a wave.
-The stem and the tendrils of the plant are curled if stimulation is experienced in the type of touch. This provides the plant with encouragement for climbing against the surfaces.

Thus, the correct answer is option (B) Thigmotropism.

Note: The so-called "host tropism," "tissue tropism," or "cell tropism" is often caused by viruses and other pathogens; in which case tropism refers to the manner in which multiple pathogens have adapted to preferentially attack particular host organisms, particular tissue, or unique cell types inside such organisms.