In Africa, orobanche is the serious pest of:
A) Sorghum
B) Sugarcane
C) Chick pea
D) All of the above
In Turkey, the serious pest of sugarbeet is:
A) Orobanche
B) Striga
C) Cuscuta
D) None of the above
In Turkey, cuscuta is the serious parasitic weed of:
A) Cotton
B) Sorghum
C) Sugarbeet
D) Sugarcane
Two heterozygous testers are used in:
A) Simple recurrent selection
B) Recurrent selection for gca
C) Recurrent selection for sca
D) Reciprocal recurrent selection
In plant breeding, undesirable linkages can be broken by:
A) Recurrent selection
B) Disruptive mating
C) Diallel selective mating
D) All of the above
Disruptive selection is a form of:
A) Pureline selection
B) Mass selection
C) Recurrent selection
D) Clonal selection
In plant breeding populations, disruptive selection is effective in:
A) Breaking undesirable linkages
B) Generating diversity
C) Improving adaptation
D) All of the above
In crop plants, clonal selection is used in:
A) Non-flowering species
B) Low seed setting species
C) Apomictic species
D) All of the above
Synthetic variety is a mixture of:
A) All possible crosses among inbreds of good gca
B) Several pure lines
C) Several open pollinated genotypes
D) Several inbred lines
Initially a synthetic variety consists of several:
A) Heterozygotes
B) Homozygotes
C) Homo and heterozygous tester
D) Purelines
In the later generations, a synthetic variety consists of several:
A) Homo and heterozygotes
B) Homozygotes
C) Heterozygotes
D) Inbred lines
The yield of a synthetic variety is always higher than:
A) Open pollinated variety
B) Single cross hybrid
C) Three way cross hybrid
D) Double cross hybrid
A synthetic variety requires reconstitution after:
A) Three years
B) Five years
C) Seven years
D) Ten years

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