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![📢SSC की परीक्षा📋 - UNI-CRACK ACADEMY {UNI-CRACK Academy DAILY STATIc GK ONE LINER DIRECTOR Info@Uni-crackcom Abhinay Tiwari +91 9214015622 WWWuni-crack com Saturday, 07 February 2026 Plant Hormones Naturally work together with auxins Plant hormones are chemical substances found in plants that are Main functions: produced in very small quantities and Promote cell division Delay senescence (aging) of leaves regulate growth, development, and Help in RNA and protein synthesis | physiological activities Used to increase plant height Auxins Discovery: Darwin (1880) Abscisic Acid (ABA) It is a growth-regulating hormone Site of synthesis: Upper parts of Discovery: 1961-65 plants (apical region) It is a growth-inhibiting hormone ice : | Main functions: Main functions: Produces apical dominance] Maintains plants in a dormant state Inhibits the growth of lateral buds Helps in Ieaf fall Aca(Inhibits seed germination Prevents leaf fall Helps in root formation] A[so know ೩s the stress hormone drop Prevents fruit Ethylene It is the only gaseous plant hormone Gibberellins Discovery: Kurosawa (1926) Confirmed as a hormone by Burg (1962) Main functions: Increases the length of the stem Main functions: Helps in fruit ripening Helps in fruit formation Breaks seed dormancy and promotes Increases the number of female germination] flowers Increases the activity of cambium Induces fall of leaves flowers and Useful for obtaining largezsized fruits Florigen fruits and flowers It induces flowering] Source: Obtained from fungi Cytokinins Synthesized in leaves and transported Discovery: Miller (1955) to other parts of the plant ० WNL0 A UNI-CRACK Academy UNI-CRACK Academy 00 Maharana Pratap Nagar, Jhansi ( ^ App Store UNI-CRACK ACADEMY {UNI-CRACK Academy DAILY STATIc GK ONE LINER DIRECTOR Info@Uni-crackcom Abhinay Tiwari +91 9214015622 WWWuni-crack com Saturday, 07 February 2026 Plant Hormones Naturally work together with auxins Plant hormones are chemical substances found in plants that are Main functions: produced in very small quantities and Promote cell division Delay senescence (aging) of leaves regulate growth, development, and Help in RNA and protein synthesis | physiological activities Used to increase plant height Auxins Discovery: Darwin (1880) Abscisic Acid (ABA) It is a growth-regulating hormone Site of synthesis: Upper parts of Discovery: 1961-65 plants (apical region) It is a growth-inhibiting hormone ice : | Main functions: Main functions: Produces apical dominance] Maintains plants in a dormant state Inhibits the growth of lateral buds Helps in Ieaf fall Aca(Inhibits seed germination Prevents leaf fall Helps in root formation] A[so know ೩s the stress hormone drop Prevents fruit Ethylene It is the only gaseous plant hormone Gibberellins Discovery: Kurosawa (1926) Confirmed as a hormone by Burg (1962) Main functions: Increases the length of the stem Main functions: Helps in fruit ripening Helps in fruit formation Breaks seed dormancy and promotes Increases the number of female germination] flowers Increases the activity of cambium Induces fall of leaves flowers and Useful for obtaining largezsized fruits Florigen fruits and flowers It induces flowering] Source: Obtained from fungi Cytokinins Synthesized in leaves and transported Discovery: Miller (1955) to other parts of the plant ० WNL0 A UNI-CRACK Academy UNI-CRACK Academy 00 Maharana Pratap Nagar, Jhansi ( ^ App Store - ShareChat](https://cdn4.sharechat.com/bd5223f_s1w/compressed_gm_40_img_600454_1170b38b_1770449599052_sc.jpg?tenant=sc&referrer=pwa-sharechat-service&f=052_sc.jpg "📢SSC की परीक्षा📋 - UNI-CRACK ACADEMY {UNI-CRACK Academy DAILY STATIc GK ONE LINER DIRECTOR Info@Uni-crackcom Abhinay Tiwari +91 9214015622 WWWuni-crack com Saturday, 07 February 2026 Plant Hormones Naturally work together with auxins Plant hormones are chemical substances found in plants that are Main functions: produced in very small quantities and Promote cell division Delay senescence (aging) of leaves regulate growth, development, and Help in RNA and protein synthesis | physiological activities Used to increase plant height Auxins Discovery: Darwin (1880) Abscisic Acid (ABA) It is a growth-regulating hormone Site of synthesis: Upper parts of Discovery: 1961-65 plants (apical region) It is a growth-inhibiting hormone ice : | Main functions: Main functions: Produces apical dominance] Maintains plants in a dormant state Inhibits the growth of lateral buds Helps in Ieaf fall Aca(Inhibits seed germination Prevents leaf fall Helps in root formation] A[so know ೩s the stress hormone drop Prevents fruit Ethylene It is the only gaseous plant hormone Gibberellins Discovery: Kurosawa (1926) Confirmed as a hormone by Burg (1962) Main functions: Increases the length of the stem Main functions: Helps in fruit ripening Helps in fruit formation Breaks seed dormancy and promotes Increases the number of female germination] flowers Increases the activity of cambium Induces fall of leaves flowers and Useful for obtaining largezsized fruits Florigen fruits and flowers It induces flowering] Source: Obtained from fungi Cytokinins Synthesized in leaves and transported Discovery: Miller (1955) to other parts of the plant ० WNL0 A UNI-CRACK Academy UNI-CRACK Academy 00 Maharana Pratap Nagar, Jhansi ( ^ App Store UNI-CRACK ACADEMY {UNI-CRACK Academy DAILY STATIc GK ONE LINER DIRECTOR Info@Uni-crackcom Abhinay Tiwari +91 9214015622 WWWuni-crack com Saturday, 07 February 2026 Plant Hormones Naturally work together with auxins Plant hormones are chemical substances found in plants that are Main functions: produced in very small quantities and Promote cell division Delay senescence (aging) of leaves regulate growth, development, and Help in RNA and protein synthesis | physiological activities Used to increase plant height Auxins Discovery: Darwin (1880) Abscisic Acid (ABA) It is a growth-regulating hormone Site of synthesis: Upper parts of Discovery: 1961-65 plants (apical region) It is a growth-inhibiting hormone ice : | Main functions: Main functions: Produces apical dominance] Maintains plants in a dormant state Inhibits the growth of lateral buds Helps in Ieaf fall Aca(Inhibits seed germination Prevents leaf fall Helps in root formation] A[so know ೩s the stress hormone drop Prevents fruit Ethylene It is the only gaseous plant hormone Gibberellins Discovery: Kurosawa (1926) Confirmed as a hormone by Burg (1962) Main functions: Increases the length of the stem Main functions: Helps in fruit ripening Helps in fruit formation Breaks seed dormancy and promotes Increases the number of female germination] flowers Increases the activity of cambium Induces fall of leaves flowers and Useful for obtaining largezsized fruits Florigen fruits and flowers It induces flowering] Source: Obtained from fungi Cytokinins Synthesized in leaves and transported Discovery: Miller (1955) to other parts of the plant ० WNL0 A UNI-CRACK Academy UNI-CRACK Academy 00 Maharana Pratap Nagar, Jhansi ( ^ App Store - ShareChat")