BIOMOLECULES AND ENZYMES

Detailed explanation-1: -What is Phototropism? “Photo” means light, and “tropism” means turning. Phototropism is the phenomenon by which the plant bends in the direction of light. Light is required by the plants to stimulate energy production by the process of photosynthesis.

Detailed explanation-2: -Phototropism, or the differential cell elongation exhibited by a plant organ in response to directional blue light, provides the plant with a means to optimize photosynthetic light capture in the aerial portion and water and nutrient acquisition in the roots.

Detailed explanation-3: -Phototropism is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light contain a hormone called auxin that reacts when phototropism occurs. This causes the plant to have elongated cells on the furthest side from the light.

Detailed explanation-4: -The activated phytochrome A changes the activity of genes located in the cell nucleus that govern plant growth and development. Resulting changes in gene expression produce the plant’s developmental responses to light, such as growth, flowering and straining towards the light.

Detailed explanation-5: -The movement of plant due to touch is known as a thigmotropic movement. Thigmotropism is a directional growth movement which occurs as a mechanosensory response to a touch stimulus.