In Pine, The Embryo Develops Within The Seed
Pines are a type of coniferous tree with distinctive long needles and an iconic cone-shaped seed pods. Pines are part of a group of plants known as gymnosperms, which are seed-producing plants that do not produce flowers. The seeds of pines are enclosed in a protective fruit that encloses and protects the seed.
The embryo in the pine seed develops within the fruit, also known as the ovule. When a pine seed is fertilized, the fertilized egg cell, or zygote, develops into an embryo. This embryo is initially in a dormant state, but as the pine tree matures, it begins to grow and expand, becoming a full-fledged tree.
Pines are heterosporous plants, meaning they produce two different types of spore. One type of spore is a male microspore, the other is a female megaspore. The female megaspore is the one that contains the embryo. The embryo grows within the female gametophyte, which itself is within the ovule. The female gametophyte forms around the embryo, and when it is fully developed, the ovule is released as a seed.
As the seeds mature, the protective fruit around the seed begins to disintegrate, releasing the seeds which can then be dispersed by wind and other means. The embryo within the seed is well protected by the fruit, allowing it to develop until it is ready to be dispersed. Once it has been dispersed, the seed germinates, and the embryo begins to grow and develop further.
In pine trees, the embryo develops within the fruit or the seed, as opposed to the flower, as is more typical in flowering plants. This is one of the many interesting features that make pines truly unique plants.