Plant seedlings emerging from the ground use the cotyledon’s engineered preparation for life. You may not be familiar with cotyledons, but you have undoubtedly seen them on newly emerged seedlings.
To get the idea, think about some other engineered devices that serve an essential preparatory function. When skydivers jump from a plane, they use carefully engineered equipment. The first thing they deploy to prepare for landing is a pilot chute. The pilot chute can’t land them safely on the ground. Its purpose is to deploy the main parachute. Perhaps more familiar to most people is the limited-use spare tire for automobiles. Those “donuts,” as many people call them, are not designed for high-speed driving or for driving long distances. They are engineered to get you to the nearest service station where the punctured tire can be repaired or replaced. The pilot chute and the limited-use spare tire are examples of engineered preparation.
Just as the pilot chute is packed into the jumper’s gear and the donut is packed into the vehicle, there is something packed into the seed called a cotyledon. Scientists classify flowering plants (angiosperms) as monocots or dicots depending whether they have one or two cotyledons folded into the seed. As soon as the seed has sent a taproot into the soil, it pulls in moisture and uses the hydrostatic pressure to push up a green shoot bearing the cotyledons. As those “donuts” break through the surface, they inflate to provide temporary, emergency photosynthesis. The seedling begins to drink up the water and nutrients from the taproot and use energy from sunlight to kickstart the photosynthesis process.
As the cotyledon’s engineered preparation for life gets the new plant started, real leaves begin to form. In a sense, the cotyledons have taken the plant to the first service station or deployed the main chute. Now it is ready to go from a seedling to a full-grown plant or tree. The seedling still has many challenges ahead, just as the parachutist or motorist does. But just as having the pilot chute or the donut packed and ready for deployment aids the jumper or the driver, the cotyledon supports the plant. Would anyone suggest the pilot chute or donut are merely accidents? We know those devices would not be possible without engineering design. In truth, cotyledons require far more complex engineering that only the master Designer can do.
— Roland Earnst © 2019