MCQ
Oxygenated blood occurs in:
- APulmonary artery.
- BRight atrium.
- CRight ventricle.
- ✓Pulmonary vein.
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Reason : Oxygen started accumulating in the atmosphere after the non-cyclic pathway of photosynthesis evolved.
$(i)$ Head is formed by the fusion of $6$ -segments.
$(ii)$ Mouth parts are biting and chewing type.
$(iii)$ Crop is the part of mid gut.
$R $: Such joints are also called Synovial joints and have almost frictionless movement due to synovial fluid.