Aquatic and Marine Biology

This is a composition analogy: a centaur is half human and half horse, while a mermaid is half woman and half fish.

Squalis alburnoides is a hybrid fish species that exhibits a unique form of reproduction where the paternal genome is often exclusively expressed or retained in certain lineages.

Tuna and Cod are significant commercial species in the Mediterranean and Southern European waters, often targeted by large-scale fishing fleets.

Dinoflagellates are marine protists known for their rapid spinning movement. Certain species, such as those causing red tides, produce potent toxins that can kill marine life, including fish.

Mangrove is an ecosystem that connects sea and land.  Mangrove trees are adapted to survive salt water. Mangroove roots are a habitat of fish. The roots provide structure and habitat for organisms such as fish to grow upon and hide behind. Oysters, mussels, sponges, snails, small fish are examples of fish that lives around mangrove roots.

Typha, commonly known as cattail, is an emergent hydrophyte that is rooted in the mud and partially submerged in water.

• Benthic animals(benthos), refer to organisms who live at the lowest level(floor) of a water body(ocean or a lake or sea), sometimes even permanently attached to the bottom. For example, polychaete worms, bivalves, echinoderms, sea anemones, corals, sponges, sea squirts, turbellarians and larger crustaceans such as crabs, lobsters, etc.
• Hence Animals which live on the floor of the sea are called benthic is a true statement.
• So, the correct answer is 'True'.

The body of the fish is supported by endoskeleton made up of bones. Fish possess a streamlined body which helps them to swim in water. Fish swim with the help of their fins. Streamlined body helps in orientation of the fish movement in a particular path.

Sharks is a plural subject, so the simple present verb 'live' is the correct form for a general fact.

Starfish are known for their ability to regenerate amputated limbs and are characterized by flexible arms attached to a central disc. The central disc is essential for complete regeneration, however arms that are partially damaged/lost are regenerated by the organism

Formation of new parts of the body, which are lost due to injury or accidents is called Restorative regeneration. Regeneration  of broken arms is called Restorative regeneration. It occurs in Echinoderms.

A. Fish - can regenerate almost any part of their central nervous system.

B.Amphibia – can regenerate their limbs.

C.Birds – regenerate their hair cells, feathers.

D.Sea cucumber - can regenerate entire alimentary canal.

So, the correct option is ‘ Sea cucumber’.

Many animals can regenerate, that is, regrow or grow new parts of their bodies to replace those that have been damaged. Echinoderms can regenerate missing limbs, arms, spines and even intestines (for example sea cucumbers). Some brittle stars and sea stars can reproduce asexually by breaking a ray or arm or by deliberately splitting the body in half. Each half then becomes a whole new animal. Planarians are flatworms when cut into pieces, each piece can grow into a new worm. Sea cucumbers have bodies that can grow to be three feet long and shows the phenomena of regeneration. Spiders can regrow missing legs or parts of legs. Sponges can be divided. The cells of the sponge will regrow and combine exactly as before. Starfish that lose arms can grow new ones, sometimes an entire animal can grow from a single lost arm. Birds (Aves) on the other hand, do not have this ability

Scientists have studied both octopuses and cuttlefish for their remarkable ability to change skin color and texture for camouflage, leading to biomimetic developments.