MCQ
Impulse originating from sinu-atrial node are transmitted to the
- ✓Atrio-ventricular node
- BBundle of His
- CPacemaker
- DPurkinje system
$S-A$ node $ \to $ $A-V$ node $ \to $ Bundle of His $ \to $ Purkinje system.
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$II.$ Phloem in the angiosperm is composed of sieve tube elements, companion cells, phloem parenchyma and phloem fibres
Identify which of the following statement is correct and select the correct option
$(i)$ They are named because of their special function of linking and supporting other tissues/organs of the body.
$(ii)$ They include cartilage, bone, adipose and blood.
$(iii)$ They provide strength, elasticity and flexibility to the tissue.
$(iv)$ They also secrete modified polysaccharides, which accumulate between cells and fibres and act as matrix.