Kingdom Animalia

'Water-vascular' system is found in sea-cucumber.

The water vascular system is referred to as a hydraulic system typically used by echinoderms for locomotion, food and waste transportation, as well as respiration. Echinoderms are marine invertebrates that include sea urchins, starfish, brittle stars, and sea cucumbers. The water vascular system is a division of the coelom, which is the most distinctive feature of echinoderms. It is a system of canals and appendages of the body wall. It is also termed an ambulacral system, which functions as a means of locomotion. It comprises a madreporite or sieve plate, stone canal, water ring or ring canal, radial canals, and podia or tube feet.

Therefore, the correct answer is option B.

The correct option is (A): Proboscis and palpi are long and more or less of equal length

The answer is correct because:

• Proboscis is a modified mouthpart that female mosquitoes use to pierce the skin and suck blood from hosts.
• Palpi are sensory organs located near the mouthparts that help the mosquito detect things like odors and moisture.
• In female Anopheles mosquitoes, the proboscis and palpi are both long and almost the same in length.
• This is one way to distinguish them from male Anopheles mosquitoes, which have much shorter palpi.

Thus, the right answer to this question is that the proboscis and palpi are long and more or less of equal length.