Question

Haemocoel is found in
(a) Hydra
(b) Cockroach
(c) Earthworm
(d) Snake

Answer 1

Hint: Haemocoel is a body cavity containing circulatory fluid present in arthropods, sponges, and mollusks. Haemocoel's circulatory fluid is known as hemolymph, which helps in the processing of nutrients, hormones and also helps in waste excretion.

Complete answer:
The cockroach is a member of the Arthropoda phylum. Haemocoel is a cavity commonly found in cockroaches and other arthropods. The haemocoel is the primary invertebrate body cavity, commonly in insects.
The blood is pumped by a heart into the cavities of the body, where the blood fills the tissues. In most vertebrates, the oxygen is supplied by capillaries in a closed circulatory system to various organs of the body.
Insects do not exhibit blood vessel structures like those in mammals. Instead, insects have a cavity filled with insect blood (known as haemolymph) , and the insect's organs are preserved in that cavity. This means that the organs do not have a clear source of blood, but are stored in the blood and obtain nutrients as the blood around the organs 'washes.'

So, the correct answer is, ‘Haemocoel’.

Note:
The haemocoel is subdivided by a transverse pericardial membrane into two cavities. The dorsal cavity is called the pericardial cavity (sinus) , and the ventral cavity as the perivisceral cavity. A blood-containing body cavity has the same embryonic roots as the blood-vascular system ( i.e. not a coelom). It replaces the coelom functionally as the primary body cavity and the hydrostatic skeleton but does not contain gametes.