On fruits and seeds in many plants before they are fully ripe develop various safety devices from being eaten by animals or from the action of unfavo

Protection of seeds and fruits during ripening [maturation]

On fruits and seeds in many plants before they are fully ripe develop various safety devices from being eaten by animals or from the action of unfavorable external conditions. On fruits and seeds are formed various outgrowths — spikes, spines, bristles, needles. The same outgrowths often develop on the bracts or on apical leaves surrounding the inflorescence. For example, in Datura, or in Buckeye (horse chestnut) develops thorny pericarp. Taken from http://worldofschool.org

Often in the process of ripening fruits and seeds contain compounds that give them a sharp, astringent, bitter taste, or contain toxics. By the time of maturation, on the contrary, they become attractive to taste (plum, cherry, walnut, grapes and so on). Protection against moisture is the ability of many plants to the hygroscopic movements of the pericarp. For example, in Caryophyllaceae in wet weather and during rain, the broken box (teeth) on the top again closes the gap; in dry weather, the teeth are bent and the seeds are planted out.

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