Question

Which of the given statements are true with respect to the circulatory system in cockroaches?
i. It is an open system with the haemolymph directly bathing the organs.
ii. Heart consists of 13 chambers.
iii. The haemolymph consists of respiratory pigments.
iv. Spiracles are connected directly to the body cells.

• A. i and ii
• B. ii and iii
• C. iii and iv
• D. ii and iv

Answer 1

The correct option is A i and ii

The circulatory system in cockroaches is open type. The circulating
fluid is called the haemolymph that is pumped into the body cavity or
haemocoel. The haemolymph is devoid of respiratory pigments. The heart is
13 chambered and pumps blood with the help of alary muscles. The
exchange of gases occurs through openings called spiracles, the spiracles
are connected to tubes called tracheae. The tracheae branch into
tracheoles that are in contact with the cells. So, the correct answer is i and ii