Question

Haemocoel is found in
(a)Hydra and Aurelia
(b)Taenia and Ascaris
(c)Cockroach and Pila
(d)Herdmania and Balanoglossus

Answer 1

Hint: Haemocoel is the body cavity present in arthropods (an invertebrate animal having an exoskeleton, a segmented body, and paired jointed appendages) and mollusks (a second-largest phylum of invertebrate animals after the Arthropoda).

Complete answer:
Hemocoel contains circulatory fluid which is found in Cockroach and Pila. The circulatory fluid assists in the transfer of nutrients, hormones, and excretion of wastes and are known as hemolymph. The hemocoel acts as a hydrostatic skeleton and is an enlarged blastocoel, which greatly reduces the coelom. Cockroaches belong to Arthropoda and Pila is a Mollusca animal.

Additional Information:

 -Cockroaches are omnivores (eat plants and meat). They have been recorded to take a bite of fingernails, eyelashes, feet, and hands of humans and also feed on dead insects and soiled clothing. The bites may cause irritation and swelling, and some have suffered from minor wound infections.
- The name Cockroaches comes from the Spanish word Cucaracha. The scientific name derives from the Latin Blatta (an insect that shuns the light).
- Most species of cockroach are small, about 2 centimeters but several species are bigger. The world's heaviest cockroach is Macropanesthia rhinoceros, the Australian giant burrowing cockroach can reach 9 centimeters in length and weigh more than 30 grams.
-The body of a cockroach is divided into a thorax of three segments and a ten-segmented abdomen. The external surface is covered by the exoskeleton and protects the inner organs. The wings are attached to the second and third thoracic segments and the first pair of wings are tough and protective, lying as a shield on top of the hind wings, which are used in flight.
-Cockroaches live in a wide range of environments, especially in the tropics and subtropics. Cockroaches can withstand extremely low temperatures of −122 °C (−188 °F) by manufacturing antifreeze made out of glycerol, allowing them to live in the Arctic.
-The males practice courtship rituals like posturing and stridulation. Cockroaches mate facing away from each other. A few species can reproduce without the need for males.
- Pila- a genus of freshwater snails with an operculum (a structure that closes or covers an aperture).
So, the correct answer is option ‘Cockroach and Pila’.

Note: Coelom is a fluid-filled cavity between the body wall and gut wall, lined by mesoderm, and is located between the intestinal canal and the body wall. It is found in annelids, mollusks, and arthropods.