Plants perform chemical coordination with the help of hormones. These are chemical compunds released in plants that diffuse to various location. There is a hormone that is synthesised at the tip of shoots. Its concentration stimulates the growth. When light comes from one side of the plant this hormone diffuses to the shady side of the shoot. This stimulates the cells to grow longer.
a. Name the hormone which is responsible for this condition.
b. The movement of the shoot towards light is known as...
c. Name the plant hormone that is not assocciated with the growth of a plant?
d. Write one differnece between the dropping movements in touch-me-not plant and bending of a shoot tip in a seedling
a. Name the hormone which is responsible for this condition.
b. The movement of the shoot towards light is known as...
c. Name the plant hormone that is not assocciated with the growth of a plant?
d. Write one differnece between the dropping movements in touch-me-not plant and bending of a shoot tip in a seedling
Answers & Comments
a. The hormone responsible for this condition is auxin. Auxins are synthesized at the tip of shoots and stimulate growth.
b. The movement of the shoot towards light is known as phototropism.
c. Abscisic acid (ABA) is a plant hormone that is not primarily associated with the growth of a plant. Instead, it is involved in various stress responses and helps regulate processes like seed dormancy and stomatal closure.
d. One difference between the dropping movements in the touch-me-not plant (Mimosa pudica) and the bending of a shoot tip in a seedling is the nature of the response. The dropping movements in the touch-me-not plant are an example of thigmonastic movements, which occur in response to touch or mechanical stimuli. In contrast, the bending of a shoot tip in a seedling is an example of phototropic movement, which occurs in response to the direction of light. Thigmonastic movements are driven by touch, while phototropic movements are driven by light.
Answer:
a) Auxin
b) The movement of plant shoots towards the light is
phototropism(photo = light; tropism = movement).
c) Abscisic acid
d) The dropping movements in the touch-me-not plant is thigmonastic movements, which occurs in response to touch. Whereas, the bending of a shoot tip in a seedling is phototropic movement, which occurs in response to the direction of light.