Question

Reproductive taproot occur in
A. Dalbergia
B. Peepal
C. Acacia
D. Banyan

Answer 1

Hint: When a seed begins the germination process, the embryo gives rise to plumule and radicle. The entire shoot system develops from the plumule and root system from the radicle. Most roots go deep into the ground, hold firmly to the soil, and help keep the parts of the plant above the ground upright. Roots also take part in the transport of water and nutrients from the soil to all parts of the plant.

Complete answer:
-Roots can be classified into- true roots and adventitious roots. True roots are roots that develop from the radicle like taproots. Adventitious roots grow from any part of the plant (say stem). It, however, does not grow from the roots. Plants with adventitious roots initially did have a radicle but their radicle degenerated in the early stages of plant development.
-Taproots can modify themselves to perform some special functions. This includes modification for storage of food, respiration, nitrogen fixation, and reproduction.
-Dalbergia has a taproot system that has been modified to carry out reproduction. The irregular roots of this tree have small buds present on them. These buds are called radicle buds. The buds give rise to tiny roots that develop into a new plant.
-The root system of the peepal tree is one of the most common examples of the taproot system. Acacia also has a taproot system, the roots go very deep into the ground because these trees need to survive in arid conditions.
-Banyan trees have special aerial roots also called prop roots. These roots arise from the thick branches of the tree and they keep growing till they reach the ground. The prop roots provide support to the tree. These roots are adventitious.

Hence, the correct answer is option (A).

Note: Taproots are found in dicot plants. The primary root develops directly from the radicle. Once the primary roots are formed, secondary and tertiary roots develop. This makes up the entire true root system. Adventitious roots are sometimes called fibrous roots. This is because they arise from the stem as very fine fibres. This fibrous root system is found in monocot plants.