Men addicted to tobacco lead to oxygen deficiency in their body. What cauld be the possible reason ?

How does smoking tobacco causes oxygen deficiency in the body?

Collect pictures of people affected by tobacco chewing and tobacco smoking. Identify which part of the body is affected and the health hazards it can lead to.

Assertion: Gastrectomy can lead to iron-deficiency or anaemia. Reason: HCl of gastric juice converts Fe^(3+) into Fe^(2+) which makes iron absorbabale.

If the error in measurement of mass of a body be 3% and in the measurement of miss of a body be 3% and in the measurement of velocity he 2%. What will be maximum possible error in calculation of kinetic energy?

Assertion: Elchhornia crassipes increases the oxygen content of water bodies. Reason: Anoxic condition in water boidies leads to Eutrophication.

Two large conducting spheres carrying charges Q_1, and Q_2, are brought close to each other. Is the magnitude of electrostatic force between theme exactly given by (Q_1Q_2)/(4pi epsi_(0) r^(2)) , where r is the distance between their centres? b. If Coulomb's law involved 1/r^(3) dependence ("instead of "1/r^2), would Gauss law be still true? c. A small test charge is released at rest at a point in an electrostatic field configuration. Will it travel along the field line passing through that point? d. What is the work done by the field of a nucleus in a complete circular orbit of the electron? What if the orbit is elliptical? e. We know that electric field is discontinuous across the surface of a charged conductor. Is electric potential also discontinuous there? f. What meaning would you give to the capacitance of a single conductor? g. Guess a possible reason why water has a much greater dielectric constant (=80) than say, mica (= 6).