Who named positive and negative charges?

Q. What are rational numbers? Give examples of five positive and five negative rational numbers. Is there any rational number which is neither positive nor negative? Name it.

Q. Who named the negatively charged particles present in cathode rays as electrons ?

Q.

Who proposed charge and how we can say charge is positive or negative or neutral and what theorem are used ? Why and give reason?

Q. An electrode A is connected to the positive terminal of battery and electrode B to the negative terminal. Give the names of the electrodes A and B.

Q. (a) Define geotropism. Give one example of geotropism.
(b) What is meant by 'positive geotropism' and 'negative geotropism? Give one example of each type. Draw a labelled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.
(c) Name one plant part which exhibits positive thigmotropism.