Question

What is negative phototropism?

Answer 1

Phototropism is most common in plants, but it may also be seen in other species like fungi. When phototropism occurs, a molecule called auxin interacts in the plant's cells that are furthest from the light. The plant's cells on the side facing the light get stretched as a result of this.

Complete answer:
The development of an organism in response to a light stimulation is known as phototropism.
The pattern of growing against light is known as negative phototropism.
Negative phototropism is described as a plant's or other organism's orientation away from the light.
The reaction of plant basal axial parts against blue light is typically a result of negative phototropism. It can be observed in plant roots. They have a downhill growth pattern and do not exhibit positive phototropism.
When auxin signalling is decreased to a bare minimum, negative phototropism can develop.

Additional information:
Auxins are a group of hormones produced by plants. IAA, also known as Indole acetic acid, is an example of a particular auxin. Apical meristems, which are found at the tips of developing stems and roots, produce them, and they can spread to other sections of the stems or roots.

Note:
Plant reactions to light are, of course, dependent on the plant's capacity to detect light. Photoreceptors, which are made up of a protein coupled to a light-absorbing pigment termed a chromophore, are used by plants to detect light. When light is absorbed by the chromophore, it changes the structure of the protein, changing its activity and initiating a signaling pathway. A response to the light cue is produced by the signaling system, such as a change in gene expression, growth, or hormone secretion.