With no explanation Answer with true or False 13.The sole objective of plant breeding is to increase crop yield per unit

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With no explanation Answer with true or False
13.The sole objective of plant breeding is to increase crop
yield
per unit area
14.Plant breeders cannot develop varieties with limited
natural
genetic variability
15. In monohybrid cross ,the genotype ratio is always equal
to
phenotypic ratio assuming complete dominance.
16.A test cross is the same as a backcross
17.A monohybrid is homozygous at all gene loci except one
18.A dihybrid is obtained by crossing two monohybrids
19.The center of diversity of coffee Abyssinia
20.The center of domestication of cassava is central America