Q41. Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

3. Defence action

Solution:
Alkaloides, flavonoides, rubber, essential oils, antibiotics, coloured pigments, scents, gums, spices. These
are called secondary metabolites.
Many of them are useful to ‘human welfare’ (e.g., rubber, drugs, spices, scents and pigments). Some
secondary metabolites have ecological importance.

Q41.  Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their