The  graph  below  shows  the  growth  rates  of  populations  of  bacteria  that  have  evolved  for  many  generations  at different culture temperatures (25°C, 30°C, and 35°C). Each population grows over only a limited range of temperatures (its thermal niche), which are bounded by its critical thermal limits. Within this range, growth rate increases with temperature up to a maximal value and then declines rapidly with increasing temperature. Growth rates are known to be the major determinant of fitness for these bacteria.

Which population has the highest fitness at 25°C ? 

#Question id: 11596

#Unit 6. System Physiology – Plant

Which enzyme catalyzes  all the reactions involving the successive oxidation steps of carbon 20 between GA53 and GA20, including the removal of C-20 as CO2?

#Question id: 11597

#Unit 6. System Physiology – Plant

GA 2-oxidase catalyzing the addition of a hydroxyl group to C-2 by inactivates

#Question id: 11598

#Unit 6. System Physiology – Plant

How the GA3 is differ from GA1______

#Question id: 11599

#Unit 6. System Physiology – Plant

Where the highest levels of gibberellins are found?

#Question id: 11600

#Unit 6. System Physiology – Plant

The first plant gibberellin to be identified was___

#Question id: 11601

#Unit 6. System Physiology – Plant

Gibberellin is an important plant hormone that regulates several aspects of plant growth and development. Some statements are given below in relation to  signalling pathways:

a) The binding of gibberellin (GA) to its receptor leads to the degradation of the DELLA repressor by the 26S proteasome

b) Gibberellin binds to the GID1 receptor and induces a conformational change in the N-terminal domain of the receptor, allowing the receptor to interact with the TVHYNP and DELLA domains of the DELLA repressor

c) The formation of the GID1-repressor complex promotes the interaction between the repressor and the E3 ubiquitin ligase SCF^TIR1 complex, leading to the ubiquitination and degradation

d) The gibberellin receptor GIBBERELLIN INSENSITIVE DWARF 1 (GID1) also itself function as an F-box protein

Which one of the following is the incorrect statements about GA  signalling pathway;