A plant hormone was first discovered in Japan when rice plant were sufferring from Bakanae disease caused by Gibberella fujikoroi. Based on this information answer the following questions.
(i) Identify the hormone involved in this process.
(ii) Which property of this hormone causes the disease?
(iii) Give two functions of this hormone.

Consider the following three statements and select the correct option starting which ones are tube (T) and which ones are false (F). (i) Hybridisation is crossing of two or more types pf plants for bringing their traits together in progeny. (ii) Semi-dwarf rice varieties were derived from IR-8 and Taichung Native -1. (iii) Hybrid breeding have led to the development of several high yeilding resistant to water stress.

Read the following statements and select the option which identifies the incorrect ones. (i) Potato spindle tuber disease and Chrysanthermum stunt disease are caused by viroids. (ii) T_(4) bacteriophage exhibits lytic cycle. (iii) Retroviruses have two copies of ssRNA. (iv) Interferous which prevent viral multiplication are glycolipid particles.

Identify the correct statements from the below about "Ethylene". (I) Denny found that ethylene stimulates the ripening of lemons. (II) R - Gane found that ripe banans contain abundant ethylene. (III) Cocken et al., identified ethylene as a natural plant hormone. (IV) Yabuta and sumiki isolated ethylene in crystalline form.