Question

Select correct statements.
(a) Fibroblast growth factors (FGFs) control cell proliferation in the development of limbs in chick.
(b) In ascidians, blood cells can give rise to a fully functional organism.
(c) In Hydra, regeneration occurs mainly by the repatterning or remodeling of existing tissues and the re-establishment of boundaries.
(d) Nematodes show very high regenerative ability.

• A. a, b and c
• B. a and b
• C. b and d
• D. a and c

Answer 1

The correct option is A a, b and c

FGFs are involved in the regulation of many developmental processes including patterning, morphogenesis, differentiation, cell proliferation or migration. In ascidians, whole-body regeneration from blood cells results from divisions of undifferentiated haemoblasts, the totipotent stem cells that freely circulate in the blood system. In Hydra, regeneration occurs mainly by the remodelling of existing tissues and the re-establishment of boundaries, thus involving very little new growth. Regenerating ability is very low in nematodes in which only closure of superficial wound is possible by high degree of cell differentiation upto fixed limit of number of cells.

Thus, the correct answer is option A.