Choose the incorrect statement.

• A

  Many of the extrinsic factors such as temperature and light, control plant growth and development via PGR.

• B

  Seed coat barrier in some seeds can be broken by mechanical abrasions using knives, sandpaper, etc. or vigorous shaking.

• C

  Roles of PGRs could be complimentary or antagonistic as well as could be individualistic or synergistic. 

• D

  Biennials are bicarpic plants that normally flower and die in the second season.