Explain the following: (a)Clinging root, (b) Contractile root

(a)Clinging root : These are non-absorptive adventitious roots which are found in climbers.The clinging roots penetrate the cracks or fissures of the support. They hold the support firmly by forming claws. E.g., Pothos (Money plant) Betel, Black pepper etc.
(b)Contractile root: The roots can shrink 60- 70% of the original length. This bring an underground organ to its proper depth is soil. E.g., Crocus, Foessia.