Keeping 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

2.

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

Vascular tissue in flowering plants develop from

• phellogen

• plerome

• periblem

• periblem

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