Plants regulate growth through hormones like abscisic acid, which inhibits growth. The effects of abscisic acid include wilting of leaves.

Multicellular organisms utilize chemical communication because it overcomes the limitations of electrical impulses, allowing for widespread and continuous signaling to coordinate various cellular activities in the body.

Cells take time to reset their mechanisms after generating an electrical impulse, preventing them from continually creating and transmitting impulses.

Electrical impulses are limited to cells connected by nervous tissue, restricting their reach to specific pathways in the animal body.

Firstly, electrical impulses only reach cells connected by nervous tissue. Secondly, cells need time to reset their mechanisms after generating and transmitting an impulse, hindering continuous transmission.

Electrical impulses are rapid and efficient means of communication in multicellular organisms due to their quick transmission, allowing for fast responses to stimuli.

Fast responses to stimuli require quick information transfer. The medium of transmission must move rapidly to facilitate swift communication within the organism.

Growth in animal bodies occurs in controlled directions, unlike haphazard growth. For example, our arms and fingers grow in specific patterns.

Controlled movements in multicellular organisms require precise information transfer. This ensures coordinated growth and responses to stimuli.

The sensitive plant displays quick movement in response to touch, while sunflowers exhibit slower movement in response to day or night.