The liquid wax is obtained from:

Match the following columns correctly:

Column-$I$	Column-$II$
$(A)$ Outcrossing	$(i)$ Agar-agar gel
$(B)$ Interspecific hybridization	$(ii)$ Mule
$(C)$ Callus culture	$(iii)$ Rotary shaker
$(D)$ Suspension culture	$(iv)$ Santa Gertrudis

Which vegetables were absent in India before the arrival of the Europeans?

Which of the following is a viral disease of poultry birds?

Consider the following four measures $(I-IV)$ that could be taken to successfully grow chickpea in an area where bacterial blight is common.
$I.$ Spray with Bordeaux mixture.
$II.$ Control of the insect vector of the disease pathogen.
$III.$ Use of disease-free seeds only.
$IV.$ Use of varieties resistant to the disease.
Which of the above measures can control the disease?

Millions of chickens were killed in West Bengal,Assam,Orissa,and Maharashtra recently. What was the reason?