Assertion : Gibberellin is useful in early seed production in conifers.

Reason : Ethephon is responsible for early ripening in tomato and apple.

Apical dominance is caused by

Assertion : The quiescent centre acts as a reservoir of relatively resistant cells, which constitute a permanent source of active initials.

Reason : The cells of the inactive region of quiescent centre become active, when the previous active initials get damaged.

Assertion Photomodulation of flower is phytochrome regulated process.

Reason Active form of phytochrome (Pfr) directly induces floral induction in shoot buds.