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251.

The potential produced in the dendrite of the sense organ by depolarization is called:

A.	Resting potential	B.	Receptor potential
C.	Generator potential	D.	Action potential

252.

The process of post-ecdysial hardening and darkening of the cuticle is regulated by:

A.	Ecdysone	B.	Juvenile hormone
C.	PTTH	D.	Bursicon

253.

The prothoracicotropic hormone is secreted by:

A.	Prothoracic glands	B.	Neurosecretory cells
C.	Corpora allata	D.	Corpora cardiaca

254.

The quantity of endosulfa 35% EC required for treating an area, which needs 1000 litres of pray fluid at 0.05% (a.i.) strength is:

A.	35 x 0.05/1000 liters	B.	2.5 x 1000/1000 liters
C.	1000 x 0.05/35 litres	D.	35x100/0.05 litres

255.

The quantity of food grains in kg consumed by a single rat in a year is:

A.	5	B.	10
C.	15	D.	20

256.

The queen in the honey colony feeds on:

A.	Royal jelly	B.	Nectar
C.	Queen substance	D.	Honey

257.

The queen termite produces _____ eggs per second:

A.	40	B.	50
C.	60	D.	70

258.

The ration of zinc phosphide in poison bait for rats is:

A.	1%	B.	2%
C.	3%	D.	4%

259.

The re-absorption of water in insect takes place in:

A.	Malpighian tubules	B.	Hepatic caecea
C.	Rectal papillae	D.	Ventriculus

260.

The recommended dose of NPV for the control of Heliothis and Spodoptera under field conditions is:

A.	125 to 250 LE	B.	250 to 500 LE
C.	500 to 700 LE	D.	750 to 1000 LE