Multiple Choice QuestionsKeeping in view the 'fluid mosaic model' for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop moment)?
Both lipids and proteins can flip-flop
While lipids and proteins can flip -flop
While proteins can flip-flop, lipids cannot
While proteins can flip-flop, lipids cannot
The C-4 plants are photosynthetically more efficient than C-3 plants because
the CO2 compensation point is more
CO2 generated during photorespiration is trapped and recycled through PEP carboxylase
the CO2 efflux is not prevented
the CO2 efflux is not prevented
What is the vital capacity of our lungs?
Inspiratory reserve volume plus tidal volume
Total lung capacity minus expiratory reserve volume
Inspiratory reserve volume plus expiratory reserve volume
Inspiratory reserve volume plus expiratory reserve volume
In which one of the following, the male and female gametophytes don't have free -living independent existence ?
Pteris
Funaria
Polytrichum
Polytrichum
Senescence as an active development cellular process in the growth and functioning of a flowering plant is indicated in
vessel and tracheid differentiation
leaf abscission
annual plants
annual plants
B.
leaf abscission
Senescence can be defined as the sum of deteriorative processes, which naturally terminate the functional life of an organism. Senescence is not confined only to the whole plant, it may be limited to a particular plant organ such as leaf and flower or cells such as phloem and xylem. Abscission is the natural shedding of leaves, foliage branches, fruits, floral parts etc. According to Leopold (1967) abscission is a Senescence phenomenon. Senescence as an active development cellular process in growth and functioning of a flowering plant is indicted in leaf abscission.
Whole plant senescence also known as overall senescence occur in annulas (eg, rice, wheat, gramme, mustard) biennials (eg, henbane or perennials.)
Nitrogen-fixation in root nodules of Alnus is brought about by
Bradyrhizobium
Clostridium
Frankia
Frankia
What will happen if the secretion of parietal cells of gastric glands is blocked with an inhibitor?
Gastric juice will be deficient in chymosin
Gastric juice will be deficient in pepsinogen
In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin
In the absence of HCl secretion, inactive pepsinogen is not converted into the active enzyme pepsin
Trichoderma harzianum has proved a useful microorganism for
bioremediation of contaminated soils
reclamation of wastelands
gene transfer in higher plants
gene transfer in higher plants
Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?
Neutrophils
Basophils
Eosinophils
Eosinophils
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