CBSE Class 11-science - Plant Growth Regulators, Photoperiodism, Vernalisation Videos

• which plant harmon found in gas form
  
• Which plant hormone promotes opening of stomata?  
• mycorrhiza promote plant growth by  a. absorbing inorganic ions from soil               b. helping plant in using atmospheric nitrogen  c.protect plant from infection                            d. serving as PGR 
• why coralloid roots are negatively geotropic 
• leaf fall occurs when  a. auxin decreases                           b. gibberellin decreases c. auxin increases                            d. ABA decreases
• Name the plant and its part from which auxin was isolated by F. W. Went.
• Name the fungus which causes the bakanae disease in rice seedlings.
• Name the three substances which were discovered and later collectively named abscisic acid (ABA).
• Name the PGR which hastens the ripening of oranges.
• From where was auxin first isolated?

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