Question

B. Answer in one - two sentence:
(8) Which zone of a flame does a goldsmith use for melting gold and silver?
(9) Which gas is necessary for the combustion of a substance?
(10) What is ignition temperature?
(11) What is Red Data Book?
(12) What is a cork used by Robert Hooke?
(13) How is sound produced?
(14) How is zygote formed? ​

Answer 1

Answer:

1)the middle zone

2) oxygen

3) the temperature at which substance start burning

4) the amount of blood collected in a particular area

5) the outer covering of bark having mostly dead cells

6) vibrations of the medium

7) fertilisation of male and female gamete