Rape is a pod. When the fruit is ripe and cracked, it will produce ejection force to eject the seeds. This is called autobiography. The so-called autobiography is spread by plants themselves and does not depend on other media.

The propagation distance of self-propagating seeds is limited, but some self-propagating seeds fall to the ground after ejection, and there will be secondary propagation. Birds, ants and mammals are all possible secondary communicators.

This spread occurs at the end of May and September every year, because China is divided into two main producing areas: winter rape (planted at the end of September and harvested at the end of May) and spring rape (planted at the end of April and harvested at the end of September).

Extended data

Other plants spread their seeds:

1, Dandelion: Dandelion seeds are spread by the wind, which includes willows and reeds, and their seeds are spread by the wind.

2. Xanthium sibiricum: The seed spread of Xanthium sibiricum is somewhat special. It is a kind of seed, which is spread and regenerated by animals.

3. Chestnuts: Chestnuts are spread through the tumbling and jumping of fruits.

4. Peas: The seeds of peas are also spread by ejection. The difference with rape is that the seed size is different, so the ejection distance is also different.

5. Coconut: The seeds of coconut are spread by water. Plants that spread seeds by water include lotus flowers.

Rape flower is developed from two carpels and pistils. Two abdominal sutures are formed on the carpels on both sides of the fruit. During the development process, a diaphragm will be formed between ventral sutures to divide the fruit into two compartments. This diaphragm is not developed from the placenta, so it is called a false diaphragm. When the fruit is ripe, the peel will crack and fall off along the ventral suture, while the seeds will stay on the fruit stalk with false diaphragm, pop up when the time is ripe, and then spread.

Rapeseed not only spreads, but also sleeps. Although rape seeds are mature after formation, they often cannot germinate immediately even under suitable environmental conditions, and can only germinate after a relatively static stage. This characteristic of seeds is called dormancy. Dormant seeds are in a state of very slow metabolism and near static.

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