The circulatory system in insects and other arthropods is best described as
A{'text': 'Open type with haemolymph bathing tissues', 'label': 'A'}
B{'text': 'Closed type with vessels of varying diameter', 'label': 'B'}
C{'text': 'Absent altogether', 'label': 'C'}
D{'text': 'Only a heart with no vessels', 'label': 'D'}
Answer & Solution
Correct answer: A. {'text': 'Open type with haemolymph bathing tissues', 'label': 'A'}
1. NCERT differentiates open vs closed circulatory systems.
2. In an open system, blood is pumped out of the heart and directly bathes the tissues.
3. Insects and most arthropods have an open circulatory system with haemolymph.
4. Annelids have a closed system; sponges lack a true circulatory system.
_Source: NCERT Class 11 Biology, Ch 4 "Animal Kingdom", §4.1.1_
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