Even though a very few cells in a `C_(4)` plant carry out the biosynthetic – Calvin pathway, yet they are highly productive. Can you discuss why?

By looking at a plant externally can you tell whether a plant is C_(3) or C_(4) ? Why and how?

Olefins can be halogenated in the allylic position by number of reagents of which N-bromo succinimide (NBS) is the most common. When this reagent is used the reaction is known as WohlZiegler bromination. Other N-bromoamides have also been used. To a much lesser extent allylic chlorination has been carried out with N-chloro-succinimide. N-Chloro-N-cyclohexyl benzene sulphonamide or t-hypochlorite when the allylic radical intermediate is unsymmetrical allylic rearrangement takes place so that the mixture of both possible products is obtained. CH_3 - CH_2 -CH = CH_2underset(hv)overset(NBS)(to) CH_3 - CH = CH - CH_2 - Br + CH_3 - undersetoverset(|)(Br)(C ) - CH = CH_2 NBS is also a highly regioselective brominating agent at other positions, including positions a to a carbonyl group.

Olefins can be halogenated in the allylic position by number of reagents of which N-bromo succinimide (NBS) is the most common. When this reagent is used the reaction is known as WohlZiegler bromination. Other N-bromoamides have also been used. To a much lesser extent allylic chlorination has been carried out with N-chloro-succinimide. N-Chloro-N-cyclohexyl benzene sulphonamide or t-hypochlorite when the allylic radical intermediate is unsymmetrical allylic rearrangement takes place so that the mixture of both possible products is obtained. CH_3 - CH_2 -CH = CH_2underset(hv)overset(NBS)(to) CH_3 - CH = CH - CH_2 - Br + CH_3 - undersetoverset(|)(Br)(C ) - CH = CH_2 NBS is also a highly regioselective brominating agent at other positions, including positions a to a carbonyl group.

Olefins can be halogenated in the allylic position by number of reagents of which N-bromo succinimide (NBS) is the most common. When this reagent is used the reaction is known as WohlZiegler bromination. Other N-bromoamides have also been used. To a much lesser extent allylic chlorination has been carried out with N-chloro-succinimide. N-Chloro-N-cyclohexyl benzene sulphonamide or t-hypochlorite when the allylic radical intermediate is unsymmetrical allylic rearrangement takes place so that the mixture of both possible products is obtained. CH_3 - CH_2 -CH = CH_2underset(hv)overset(NBS)(to) CH_3 - CH = CH - CH_2 - Br + CH_3 - undersetoverset(|)(Br)(C ) - CH = CH_2 NBS is also a highly regioselective brominating agent at other positions, including positions a to a carbonyl group. Which of the following is allylic chlorinating agent ?

RUB is CO is an enzyme that acts as both as a carboxylase and oxygenase. Why do you think RUB is CO carries out more carboxylation in C_(4) plants ?