Tag: biology

The spontaneous removal or casting off of a body part, especially when the organism is injured or under attack is autotomy or self ampulation. It is recorded in loss legs in crabs, loss of tails in lizards, loss of viscera in Holothurian echinoderms.

So, the correct option is ‘All the above’.

The reconstruction of an entire animal from a small fragment by reorganizing the existing cells, is called Morphallaxis. The regenerated animal is far smaller than the original one after the completion of the process. It grows to attain the normal size. It is reported in Porifers, Coelenterates, flatworms, Nemarteans, and some ascidians.

So, the correct option is ‘Porifers, Coelenterates, flatworms, Nemarteans, and some ascidians’.

A. Morphallaxis - The reconstruction of an entire animal from a small fragment by reorganizing the existing cells, is called Morphallaxis.

B.Epimorphosis - The regeneration of tissues or organs through the dedifferentiation of existing, differentiated adult tissues

C.Epigenesis - The theory, now generally held, that an embryo develops progressively from an undifferentiated egg cell.

D. Auxetic growth – Growth takes place by the influence of auxins.

So, the correct option is ‘Auxetic growth’.

Formation of new cells or tissues in the body organs is called Regeneration. It is first discovered in hydra by Abraham Trembley.

So, the correct option is ‘Hydra’.

The Nanda Devi Biosphere Reserve, established in 1982, is a national park situated around the peak of Nanda Devi in the state of Uttaranchal.

The IUCN Red List, 2004, documents the extinction of 784 species including 338 vertebrates. 359 invertebrates and 87 plants in the last 500 years.

Red data book is a catalogue of taxa facing risk of extinction. it is maintained by IUCN.  

IUCN stands for International Union for Conservation of Nature and Natural Resources. It is the authority on threatened species, and it treats threatened species as a group of three categories, depending on the degree relative to which they are threatened. Those categories are Vulnerable species; Endangered species and Critically endangered species. As per the Red list of 2000, there are 11,096 threatened species.