Question

A root is adventitious when it is
A.Swollen
B.Growing in marshy places
C.Formed from plumule
D.Modified for storage

Answer 1

Hint: Root is the part of the plant that is underground . The main functions of the root system are absorption of water and minerals from the soil , providing proper Anchorage to the plant parts , storing of plant food reserve material and also the synthesis of plant growth regulators which are required for proper growth of plant and their development .

Complete answer:
1. In the majority of dicotyledonous plants the direct elongation of the radical leads to the formation of the primary root which grows inside the soil .
2. It bears lateral roots of several orders that are referred to as secondary , tertiary etc. roots The primary roots of its branches constitute the tap root system as seen in mustard plants .
3. Primary root is replaced by a large number of roots that originate from the base of the stem in monocotyledonous plants and that constitutes the fibrous root system as seen in wheat plants .
4. Adventitious roots are the roots that arise from parts of the plant other than the radical of the plant. It can form a plumule for example .
Roots get swollen to store food; it can be taproot or adventitious root . It is a type of modification in roots .

Hence the correct answer is OPTION(C)

Note: In some plants roots other than the conduction of water and minerals can change their shape in structure to perform other functions also. For example in banyan trees the hanging roots are called prop roots .