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261.

The reproductive system of insect is derived from:

A.	Ectoderm	B.	Endoderm
C.	Ectoderm and mesoderm	D.	Ectoderm and endocderm

262.

The safest method of disposing off the leftover pesticide is disposal by:

A.	Pouring in the drain	B.	Pouring in a pond
C.	Pouring in a moving stream	D.	Burying in the soil

263.

The size (in micrometers in diameter) of droplets produced by high volume sprayers should most appropriately be:

A.	200 to 500	B.	100 to 150
C.	81 to 100	D.	30 to 40

264.

The sperms after copulation in insects are stored in the female in:

A.	Vagina	B.	Spermatheca
C.	Accessory glands	D.	Seminal vesicle

265.

The spray is classified as aerosol when average droplet size (volume median diameter) is:

A.	50	B.	50-100
C.	100-200	D.	200-400

266.

The stability of ecosystem is maintained by:

A.	Homeostasis	B.	Diversity of species
C.	Food web	D.	Trophic levels

267.

Which of the following statement is not correct?

A.	All pests are pathogens	B.	All pathogens are pests
C.	Some parasites are beneficial to plants	D.	Some flowering plants are agricultural pests

268.

The striking diffeerence in male and female cockroach is in:

A.	Shape of the wings	B.	Number of antennal segments
C.	Presence or absence of anal style	D.	Structure of the compound eyes

269.

The synergist of malathion is:

A.	Piperonyl butoxide	B.	Sesamolin
C.	N-isoibutylundecyleneamide	D.	Sesamax

270.

The terminal abdominal segments 6 to 9 are telescoped within the segment 5 when not in use. This condition is found in:

A.	Butterfly	B.	House fly
C.	Dragon fly	D.	White fly