Question

Statocysts are found in
A. Ascaris
B. Palaemon
C. Taenia
D. Catla

Answer 1

Hint: Statocysts are also known as balancing organs and are found in many phyla of the animal kingdom. Mostly in invertebrates. The organisms belonging to the largest and second-largest phylum of the animal kingdom possess statocysts. It is seen in an arthropod which is often consumed as food in many regions.

Complete answer:
Statocysts are found in organisms belonging to the phylum Arthropoda and Mollusca. These are also known as lithocysts and are related to equilibrium and balance. Palaemon or Prawn belongs to the phylum Arthropoda and therefore has statocysts.

Additional Information:
 General features of phylum arthropods are as follows:
-The body has three parts namely head, cephalothorax or trunk, and abdomen.
-The possessed appendages.
The body wall consists of a thick chitinous exoskeleton made up of cuticle, epidermis, and muscles which are arranged in the form of bundles.
-Hemocoel type of body cavity is seen.
-The complete digestive tract is found in arthropods and it contains the three parts, stomodaeum, mesenteron, and proctodeum.
-Respiratory organs include gills, book gills, trachea, or book lungs.
-The heart has many chambers and pulsatiles.
-Excretory organs include green glands or antennary glands or maxillary glands, Malpighian tubules, and coxal glands. Excretory products are ammonia in aquatic form and uric acid in terrestrial form.
-They have compound eyes with numerous ommatidia and they are capable of mosaic vision.
-The nervous system is composed of a circumcenter ring and a double, solid, ganglionated mid ventral nerve cord.
-These organisms communicate via pheromones.

So, the correct answer is, ” Statocysts are found in Palaemon.”

Note: Arthropods are the most successful invaders of the terrestrial environment and amount all the invertebrates because of the presence of cuticles, appendages, and wings. The respiratory system in arthropods is most efficient as the oxygen is directly delivered to the cells through the trachea and tracheoles. Many arthropods show the unique feature of parental care.