21. Among the following, which is the efficient breeding method used for breaking undesirable linkages?
A) Pedigree method
B) Disruptive selection
C) Pureline selection
D) SSD method
Explanation: Disruptive selection helps break undesirable linkages by selecting extreme genotypes.
22. Yield prediction and reconstitution is possible in case of
A) Hybrid variety
B) Composite variety
C) Synthetic variety
D) Pureline variety
Explanation: Synthetic varieties allow yield prediction and can be reconstituted from parental lines.
23. Synthetic and composite varieties are mostly relevant to
A) Self-pollinated
B) Cross-pollinated
C) Both self- and cross-pollinated
D) None of these
Explanation: These varieties are suited for cross-pollinated crops.
24. Base material used to produce synthetic varieties are
A) Open pollinated variety
B) Inbred
C) Clones
D) All of these
Explanation: Synthetic varieties can be formed from inbreds, open-pollinated varieties, or clones.
25. A variety which is produced by crossing between a number of lines in all possible combinations which combine well with each other is known as
A) Composite variety
B) Germplasm complexes
C) Synthetic variety
D) All of these
Explanation: Synthetic varieties are developed by crossing lines in all combinations that combine well.

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