Scientists have succeeded in recovering healthy plants from a diseased one.
(a) Name the part of the plant used as explant by the scientists.
(b) Describe the procedure the scientists followed to recover the healthy palnts.
(c ) Name this technology used for crop improvement

Explanation

Meristem (apical, axillary).
The explant or virus-free meristem is grown in nutrient medium under aseptic conditions.
The tissue proliferates to form undifferentiated mass/callus. This callus formed is transferred to a medium containing growth hormones like auxins and cytokinins.
Tissue culture or-micropropagation.