MCQ
The axillary buds arise:
- AEndogenously from the pericycle.
- BExogenously from the tissues of the shoot apex.
- CEndogenously from the cambium tissues.
- DExogenously from the innermost layers of cortex.
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($i$) 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.