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Gibbane ring skeleton in structure and p...

Gibbane ring skeleton in structure and production of hydrolytic enzymes in barley endosperm is a characteristic of

A

Cytokinin

B

Auxins

C

Gibberellins

D

Ethylene

Text Solution

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The correct Answer is:
C
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Make corrections wherever you find mistake in spellings/words in the following parapraphs/sentences. (A) During the period of senescence, a gradual addition occurs in the structure and functioning of an organ or organism which is characterised by the accumulation of active metabolic materials and increase in dry weight. (B) When the movement of curvature is produced by diffused stimuli and affects the whole plant uniformly, it is of tropic type. If the curvature is produced by directional mutimuli and does not affect the whole plant, it is of nastic type. (C) Shoot elongation in some dwarf varieties and barley endosperm test are used as bioassays for auxins and Avena curvature test is used as bioassay for ethylene.

Assertion : Gibberellic acid increases the yield of malt from barley grain. Reason :Gibberellins stimulate the synthesis of amylase, protease and other hydrolytic enzyme for mobilisation of reserve food.

Phenols are converted into their salts by aqueous NaOH but not by aqueous bicarbonates. The salts are converted into the free phenols by aqueous mineral acids, carboxylic acid or carbonic acids. Most phenols have K_(a) value of about 10^(-10) , and are tremondously more acidic than alcohols. The difference in acidity are due to difference in stablities of reactants and products. Phenol and phenoxide ions contain benzene ring and therefore must be hybrid of Kekuley structures Being basic, oxygen can share more than a pair of electron with the ring. Since energy must be supplied to separate opposite charge, the structure of phenols should contain more energy. The net effect of reasonance is therefore to stablise the phenoxide ion to a greater extent than the phenol and thus to shift the equilibrium towards ionization and make K_(a) larger than for an alcohol. Correct order of acidity is

CENGAGE BIOLOGY-PLANT GROWTH AND DEVELOPMENT -Archives
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  3. Which one of the following pairs is not correctly matched?

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  4. The wavelength of light absorbed by Pr form of phytochrome is

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  5. The hormone which was discovered through ' foolish seedling ' disease ...

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  6. Senescence as an active devlopmental cellular process in the growth an...

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  7. Impotance of day length ( photoperiodism ) in flowering of plants was ...

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  8. One of the synthetic auxin is

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  9. Which one of the following acids is a derivative of carotenoids?

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  10. Phototropic curvature is result of uneven distribution of

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  11. Impotance of day length ( photoperiodism ) in flowering of plants was ...

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  12. Coiling of graden pea tendrils around any support is an example of

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  13. One of the commonly used plant growth hormone in tea plantation is

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  14. Root development is promoted by

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  15. Through their effect on plant growth regiulators, what do the temperat...

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  17. Vernalization stimulates flowering in

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  18. During seed germination, its stored food is mobilised by

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  19. Which one of the following is not used for ex situ plant conservation

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  20. Non-albuminous seed is produced in

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  21. Which one o f the following plant hormone (phytomone ) Is know as a st...

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