Define ascent of sap and prove with and experiment that xylem is the only element through which water moves up.

Ascent of sap takes place through phloem .

True or false .If false give the correct answer. The stremlined body shape of fish help it to move through the water easily.

Water which is absorbed by roots is transported to aerial parts of the plant through

Explain how Corpuscular theory predicts the speed of light in a medium, say, water, to be greater than the speed of light in vacuum. Is the prediction confirmed by experimental determination of the speed of light in water? If not, which alternative picture of light is consistent with experiment?

A beam consisting of protons and electrons moving at the same speed goes through athin region in which there is a magnetic field perpendicular to the beam. Protons and the electrons

a. Name the experiment which establishes the wave nature of moving electrons. b. In that experiment, electrons are accelerated through a potential of 54 V and is made to fall normally on the nickel crystal of interatomic separation 0.91 A. Draw the polar graph showing the variation of intensity of the scattered electrons electrons and latitude angle at this potential. c. Calculate the d-Broglie wavelength of the electron.

A Test tube containing water, Ferricyanide and isolated chloroplasts was illuminated. A gas start evolving on the basis of their experiment. Answer the following questions. From which raw material is the gas evolved?

Two dice are thrown and the sum of the number which come up on the dice is noted. Let us consider the following events associated with the experiment A: 'the sum is even'. B: 'the sum is a multiple of 3'. C: 'the sum is less than 4'. D: 'the sum is greater than 11'. Which pairs of these events are mutually exclusive?