The solution used for white washing of the wall is quick lime(CaO).And when this quick lime is mixed with water it gets converted into slaked lime [Ca(OH)2]
and on exposure to the air it finally gets converted into Calcium carbonate[CaCO₃] due to which walls shine...

1.CaO + H₂O -----> Ca(OH)₂
2.Ca(OH)₂ + CO₂ -----> CaCO₃

The process of photosynthesis takes place in the green leaves of a plant. The carbon dioxide gas required for making food is taken by the plant leaves from the air which enters the leaves through tiny pores called stomata. Water required for making food is taken from the soil which is transported to the leaves from the soil through the roots and the stem. The sunlight provides energy required to carry out the chemical reactions involved in the preparation of food. The green pigment called chlorophyll absorbs sunlight energy.

Nuclear energy is generated by nuclear fission process.

When slow moving neutron are made to strike the atom of a heavy element ²⁵³₉₂U, a reaction takes place and this reaction is known as nuclear fission.

Advantages of nuclear energy:

1.  It produces large amount of useful energy from a very small amount of a nuclear fuel.
2. Once the nuclear fuel is loaded into the reactor, the nuclear power plant can go on producing electricity for two to three years at stretch. There is no need of feeding the fuel again and again.
3. It does not produces any harmful gases like CO2 ,CO etc.

Disadvantages of nuclear energy:

1. The waste product of nuclear is very tough to store.
2. Very high cost if installation is required.

Bile is a fluid that is made and released by the liver and stored in the gallbladder. Bile helps with digestion. It breaks down or emulsify fats into fatty acids, which can be taken into the body by the digestive tract. Bile contains mostly cholesterol, bile acids (also called bile salts), and bilirubin (a breakdown product of red blood cells). It also contains water, body salts (such as potassium and sodium), copper and other metals. Thus, option B is correct. Bile does not function in digest fat by enzymatic action, eliminate waste product or regulate process of digestion.

The Khilafat Movement was launched by Muhammad Ali and Shaukat Ali. Gandhiji saw this as an opportunity to bring Muslims under the umbrella of a unified national movement. At the Calcutta Session of the Congress in September 1920, he convinced other leaders to start a Non-Cooperation Movement in support of Khilafat Movement.
The Khilafat Movement (1919-1924), was a pan-Islamic, political protest campaign launched by Muslims in British India to influence the British Government and to protect the Ottoman empire during the aftermath of First World War. The First World War had ended with the defeat of Ottoman Turkey.
There was a fear that the power of the spiritual head of the Islamic world (Khalifa) would be curtailed. To defend his power, a Khilafat Committee was formed in Bombay in 1919. The Khilafat leaders put pressure . upon the British Government to give better treatment to Turkey.

Checks and balances: a system that allows each branch of a government to amend acts of another branch so as to prevent any one branche from exerting too much power