Questions

 Thomas Jefferson (April 13, 1743 – July 4, 1826) was the third President of the United States (1801-1809) and the principal author of the Declaration of Independence (1776).

Mixed heart means the heart in which the oxygenated and the deoxygenated blood is mixed. Reptiles and amphibians have mixed heart.

The Swadeshi movement is the first movement launched against the British in India started in the year 1905. It is part of the Indian independence movement and the developing Indian nationalism was an economic strategy aimed at removing the British Empire from power and improving economic conditions in India by following the principles of swadeshi and which had some success.

An English word with five letters in which if you remove the last four letters, still pronounced the same is QUEUE.

The given letters equation states that 

18 H on a GC means 18 Holes on a Golf Course. 

Blueberries are the saddest fruits.

Reason ::

In English some colors are associated with feelings. Blue is associated with sadness. When you "feel blue" it means that you are feeling sad.

Hence, as blueberries has blue in its name it indicates that that is the saddest fruit in logic.