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NEET UG BIOLOGY MCQ: STRUCTURAL ORGANISATION IN ANIMALS
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Read the given statements about blood vascular system of cockroach
I. Circulatory system of cockroach is of closed type
II. It contains no blood vessels except aorta heart
III. Heart is 6 chambered
IV. The haemolymph is composed of colourless plasma and haemocytes
Which of the statements given above is/are incorrect
I. Circulatory system of cockroach is of closed type
II. It contains no blood vessels except aorta heart
III. Heart is 6 chambered
IV. The haemolymph is composed of colourless plasma and haemocytes
Which of the statements given above is/are incorrect
View answer and explanation
Correct option: C
I and III
Option B (I, II and III) is correct because statements I and III are incorrect regarding the circulatory system and heart of a cockroach.
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i) Cardiac fibres are branched with one or more nuclei.
ii) Smooth muscles are unbranched and cylindrical.
iii) Striated muscles can be branched or unbranched.
iv) Involuntary muscles are non-striated. The ciliated columnar epithelial cells in humans are known to occur in The outermost wall of spermatophore of cockroach is composed of the secretions of