A form of serotiny, called pyriscence.
Serotiny is a phenomenon among seed-bearing plants, wherein the release of the seed is triggered by a specific set of environmental conditions. The most common form of serotiny is pyriscence, that is, when the release of seeds is contingent upon the presence of heat, or fire.
Above, a Jack Pine cone opens when heated. This is due to the resin, which had sealed the cone shut, melting.
Gif: biodiverseed, from this video
(h/t to @kookabugger)

A form of serotiny, called pyriscence.

Serotiny is a phenomenon among seed-bearing plants, wherein the release of the seed is triggered by a specific set of environmental conditions. The most common form of serotiny is pyriscence, that is, when the release of seeds is contingent upon the presence of heat, or fire.

Above, a Jack Pine cone opens when heated. This is due to the resin, which had sealed the cone shut, melting.

Gif: biodiverseed, from this video

(h/t to @kookabugger)