Read the following statements with reference to the villi of small intestine.(i) They have very thin walls.(ii) They have a network of thin and small blood vessels close to the surface.(iii) They have small pores through which food can easily pass.(iv) They are finger-like projections. Identify those statements which enable the villi to absorb digested food. * (i), (ii) and (iv)
(ii), (iii) and (iv)
(iii) and (iv)
(i) and (iv)

(i),(ii) and (iv)

Explanation:

Villi are finger-like outgrowths of the human intestine.

The main role of villi is to amplify surface area for rapid absorption of digested food. They have very tiny walls; the role of these walls is to pass digested nutrients through diffusion. These are directly connected to the blood vessels. Thus, the circulating blood can carry these nutrients away.

The correct answer is the first option.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

d

explanation: