Question

Open circulatory system is present in $(i)$ and $(ii)$. Fill the correct option for $(i)$ and $(ii)$.

• A. $(i)$-platyhelminthes $(ii)$-molluscs
• B. $(i)$-arthropods $(ii)$-echinoderms
• C. $(i)$-annelids $(ii)$-arthropods
• D. $(i)$-arthropods $(ii)$-molluscs

Answer 1

Answer: (D)

$(i)$-arthropods $(ii)$-molluscs

Answer 2

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."