Question

Open circulatory system is present in (i)______ and (ii)______.

• A. (i)-Platyhelminthes, (ii)-Molluscs
• B. (i)-Arthropods, (ii)-Echinoderms
• C. (i)-Annelids, (ii)-Arthropods
• D. (i)-Arthropods, (ii)-Molluscs

Answer 1

The correct option is D (i)-Arthropods, (ii)-Molluscs

Arthropods and Molluscs havean open circulatory system,where blood fills the body cavity called the haemocoel and the blood comes in direct contact with the organs/tissues. The blood is referred to as the haemolymph.

So, the correct answer is "(i)- Arthropods ii)- Molluscs."