Final answer:
Plant-based alkaloids are toxic compounds synthesized by plants to protect against pests and predators. They mainly target the nervous system, causing damage and deterring animals from feeding on the plants.
Step-by-step explanation:
Plant-based alkaloids are largely related to damaging the nervous system.
These alkaloids are toxic compounds synthesized by plants as chemical defenses against pests and predators, including animals and insects.
The noxious smells and unpleasant taste of alkaloids deter animals from feeding on the plants, helping to protect them from harm.