Angezish chist?

 Har organizm ba muhiti beruna robitai nogusastani dorad: az on gizo megirad, ba tasiri omilhoi musoidu nomusoidi muhit va digar organizmho duchor meshavad. Dar rafti evolyutsiya dar organizmhoi zinda qobiliyati ba hama guna tasiroti muhiti beruna intikhoban javob gardondan paydo meshavad.

In khususiyatro angezish menomand. Hamai tagyirothoe, ki organizmro ihota kardaand, nisbat ba on angezanda ba shumor meravand. Organizm tasiri angezandaro his karda angezish meyobad.

Mavjudoti serhujayra angezahoro tavassuti silsilai asab ehsos menamoyand va in amal refleks nomida meshavad.

Dar organizmhoe, ki silsilai asab nadorand, masalan, soddatarinho yo rastaniho refleks mavjud nest. Aksulamali chunin organizmho ba tasiroti angezanda dar tagyiryobii sokhti harakat yo afzoish zohir meshavad. In guna hodisaro taksis yo tropizm menomand va ba on nomi angezanda hamroh karda meshavad. Masalan, fototaksis – harakat jonibi rushnoi: khemotaksis – joyivazkunii organizm nisbat ba tasiri moddai khimiyavi. Har navi taksis, vobasta ba on ki kadom angezanda organizmro jalb yo dur mekunad, musbat yo manfi meshavad.

Tropizm tarzi muayyani afzoishro ifoda karda, faqatkhosi rastaniho meboshad. Masalan, geliotropizm (az yunoni, gelios – oftob) sabzishi qismi ruizaminii rastani (poya, barg) ba jonibi oftob, geotropizm (az yunoni, geo – zamin) sabzishi qismi zerizaminii rastani (resha) jonibi markazi zamin ast.

Ba rastaniho hodisai nastiya niz khos meboshad. CHunonchi, harakati yagon uzvi rastani, masalan, poya va bargi oftobparast, dar davomi ruz vobasta ba vazi oftob, boz va pushida shudani gulbargi guli shomu sahar, lola va gayraho.