MCQ
Phylloclade is found in
- AChrysanthemum
- BAsparagus
- CRuscus
- ✓Opuntia
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$I$. Located at lateral wall of the right atrium
$II$. Heart of heart
$III$. It initiates the rhythmic contractile activity of the heart
$IV$. It is called pace keeper of the heart
$V$. It is called pace maker of the heart
The option with correct statements is/are
($i$) It consists of a network of trachea, that open through $12$ pairs of small holes called spiracles present on the lateral side of the body.
($ii$) Thin branching tubes carry oxygen from the air to all the parts.
($iii$) The opening of the spiracles is regulated by sphincters.
($iv$) Exchange of gases take place at the tracheoles by diffusion.