Analyse the activities in the evolution of life and modify the flow chart by arranging them in the correct order.

Aluminium is prepared industrially by Hall- Heroult process. Various steps in the concentration of ore are given below. Write them in the correct order. i)The precipitate formed is separated, washed and strongly heated to get alumina. ii) Crushed bauxite is leached with hot sodium hydroxide solution. iii) Impurities are removed from the sodium aluminate solution by filtration. iv) Solution is diluted after adding a little aluminium hydroxide, to precipitate aluminium hydroxide .

Given below are the steps in the working of a flouroscent lamp. Arrange them in the proper order. Ultraviolet rays are produced , Visible light is emitted , Fastly moving electrons collide with the unionized molecules of mercury, Due to electric current thorium oxide coated heating element becomes red hot .

Analyse the table and arrange the matter is an appropriate order.

Kingdom - Camivora phylum - Mammalia Class - Felidae Order - Chordata Family - Tigris Genus - Animalia Sps - Panthera Correct the mistakes of the flow chart to get the hierarchial arrangement of tiger in the ascending order.

A student arranged the halide ions in the increasing order of polarisabillity as: F lt I lt Cl lt Br. Is this the correct order? If not write it in correct order

The quantum numbers listed below are of four different electrons in an atom . Arrange them in the increasing order of energy

Given below are the stages in the generation of optic nerve impulse or action potential on the retina and the role of opsin and retinal in the mechanism of vision. Arrange them in a sequential order. a) Action potential (impulses) are transmitted by the optic nerves to the visual cortex area of the brain. b) Light induces dissociation of retinal from opsin. c) Generates action potential in the ganglion cells through bipolar cells. d) Structural changes in the opsin which induce membrane permeability changes. e) Potential differences are generated in the photoreceptor cells. f) Neural impulses are analyzed by visual cortex area of the brain.