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461.

Parthenogenesis in mustard aphid (Lypaphis erysimi) is combined with:

A.	Psedogenesis	B.	Polyploidy
C.	Viviparity	D.	Hermaphroditism

462.

Patterns of evolution is:

A.	Mendelian variation	B.	Interspecific hybridization
C.	Polyploidy	D.	All of the above

463.

Peat soil are generally characterised as:

A.	Black, heavy and acidic soil	B.	Red, light and acidic soil
C.	Black, light and alkaline soil	D.	Black, heavy and neutral soil

464.

Pectinophora gossibiella is known as:

A.	Spotted bollworm	B.	American bollworm
C.	Pink bollworm	D.	Fruit borer

465.

Which of the following is ethylene absorbent?

A.	KMnO4	B.	KNO3
C.	K2SO4	D.	KCI

466.

Which of the following is controlled by gibberellic acid?

A.	Fruit fall	B.	Ripening of fruits
C.	Vegetative growth	D.	Prevention of the loss of flowers

467.

Periodic occurrence over a large area, more population affected, the disease is:

A.	Endemic	B.	Local
C.	Epophytotic	D.	Gummosis

468.

pH value of freshly drawn milk is:

A.	6.2 to 6.4	B.	6.5 to 6.7
C.	6.7 to 7	D.	7.0 to 7.5

469.

Phalaris minor is an important weed of:

A.	Rice crop	B.	Maize crop
C.	Wheat crop	D.	Sugarcane crop

470.

Photochemical excitation in chloroplasts is directly responsible for:

A.	Photo-oxidation	B.	Photo-reduction
C.	Photophosphorylation	D.	All of the above