Question

Planaria possess high capacity of:

• A. Regeneration
• B. Alternation of generation
• C. Bioluminescence
• D. Metamorphosis

Answer 1

The Correct Option is A

Planaria are fascinating organisms belonging to the phylum Platyhelminthes, known for their remarkable ability of regeneration. Let's understand the concept of each option to justify why 'Regeneration' is the correct answer.

1. Regeneration:

   Regeneration is the process by which organisms replace or restore lost or damaged tissues, organs, or entire body parts. Planaria are well-known for their extraordinary regenerative capabilities. If a planarian is cut into several pieces, each piece has the potential to regenerate into a complete organism. This is primarily due to the presence of pluripotent stem cells, also known as neoblasts, which can differentiate into various cell types needed for regeneration.

   Therefore, the correct answer is Regeneration.

2. Alternation of generation:

   This is a reproductive cycle found in plants and some algae, where there is an alternation between two generations: the haploid gametophyte and the diploid sporophyte. Planaria do not exhibit this biological phenomenon. Hence, this option is incorrect.

3. Bioluminescence:

   Bioluminescence is the production and emission of light by living organisms. It is commonly observed in some marine creatures like jellyfish and certain species of fungi and insects like fireflies. Planaria do not possess bioluminescent abilities. Hence, this option is incorrect.

4. Metamorphosis:

   Metamorphosis is a biological process by which an animal physically develops after birth or hatching, involving a conspicuous and relatively abrupt change in the animal's body structure. This process is commonly seen in insects, amphibians, and some marine animals. Planaria do not undergo metamorphosis. Hence, this option is incorrect.

In conclusion, the defining characteristic of planaria is their incredible regenerative ability. Therefore, the option 'Regeneration' is the correct answer.