Respiration in Plants Question 40
40. During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undegraded?
(a) Cellulose
(b) Lipids
(c) Lignin
(d) Hemi-cellulose
Show Answer
Answer : c
Hints & Solutions
(c) Lignin is a complex polymer of phenylpropane units, which are cross-linked to each other with a variety of different chemical bonds. Lignin and its related metabolism play important roles in the growth and development of plants. As a complex phenolic polymer, lignin enhances plant cell wall rigidity, hydrophobic properties and promotes minerals transport through the vascular bundles in plant.
