MCQ
The toad possesses
- ABifid tongue, slippery skin and mucous glands
- BSalivary glands, mucous glands and parotid glands
- ✓Parotid glands, warty skin and semicircular snout
- DSlippery skin, yellow pigment and abundant mucous glands
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- effective biocontrol agents ofseveral plant pathogens
- A biological control being developed for use in the treatment of plant disease select correct option on the basis of above sentences
($i$) 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.
Reason : This happens because of the presence of $hCG$ in the blood of females.