The toxicants which kill the pests on coming in direct contact are known as

Heterosis (hybrid vigor) is desirable in vegetatively propagated plants because...

$A$: Encephalomalacia,a disease of poultry,is caused by the protozoan $Eimeria$.
$R$: Encephalomalacia causes bloody diarrhoea in poultry.

Quarantine regulation is meant for

Which of the following are exotic breeds in poultry farming?

In an experiment,freshly hatched larvae of an insect (Khapra beetle) were reared on a basal diet (complete diet without cholesterol) with increasing amounts of cholesterol. Results obtained are shown in the given graph.
The graph indicates: