A ball of snow when rolled over snow increases in mass, volume and size. Is this comparable to growth as seen in living organisms ? Why?

Give the technical terms used for the following: In unicellular organisms growth involves increase in volume and number of organelles, cell division serves as a means of reproduction in these organisms and leads to increase in population.

Living beings have a definite shape and size. The growth of an living organism is an internal and biological process controlled by protoplasm. All organisms are made up of cells. How coordination and healing occurs in living beings?

Estimate the average mass density of a sodium atom assuming its size to be about 2.5 overset@A . (Use the known values of Avogadro’s number and the atomic mass of sodium). Compare it with the density of sodium in its crystalline phase : 970 kg m^-3 . Are the two densities of the same order of magnitude ? If so, why ?

An air chamber of volume V has a neck area of cross section a into which a ball of mass mjust fits and can move up and down without any friction (Fig.14.27). Show that when the ball is pressed down a little and released , it executes SHM. Obtain an expression for the time period of oscillations assuming pressure-volume variations of air to be isothermal [see Fig. 14.27

In an experiment to estimate the size of a molecule of oleic acid 1mL of oleic acid is dissolved in 19 mL of alcohol. Then 1 mL of this solution is diluted to 20 mL by adding alcohol. Now 1 drop of this diluted solution is placed on water in a shallow trough. The solution spreads over the surface of water forming one molecule thick layer. Now, lycopodium powder is sprinkled evenly over the film and its diameter is measured. Knowing the volume of the drop and area of the film we can calculate the thickness of the film which will give us the size of oleic acid molecule. Read the passage carefully and answer the following questions : why do we dissolve oleic acid in alcohol ?

These questions consist of two statements each,printed as Assertion and Reason.While asnwering these questions you are required to choose any one of the following four responses. Assertion:Volume of blood ejected from the ventricles in one heart beat is called cardiac output. Reason:Cardiac output increases with the increase in body size of organism.

Compute the bulk modulus of water from the following data: Initial volume = 100.0 litre, Pressure increase = 100.0 atm (1 atm = 1.013 xx 10^5 Pa). Final volume = 100.5 litre. Compare the bulk modulus of water with that of air (at constant temperature). Explain in simple terms why the ratio is so large.