III. Bob. O’simliklarning tarqalishi.....................................................31

3.1 O’simliklarning o’sish va rivojlanishiga tuproq muhitining ta’siri va o’simliklarning moslanishlari................................................................................31

3.2 Tuproqning tuz rejimiga o‘simliklarning reaksiyasi.....................................33

IV. Bob. Hayvonlarning tarqalishi............................................ .................39

4.1 Tuproq hayvonlari muxit omillari bilan bog’liq bo’lgan holda guruhlari..................................................................................................................39

4.2 Mikroorganizmlarning tarqalishi va ahamiyati............................................43

4.3 Tuprokda organik kompleks xosil bo’lishi va uning parchalanishida mikroorganizmlarning axamiyati..................................................................49