Question

Q-6 Do as directed. (10)

(1) Explain – Threshing

(2) Which part of the flame does goldsmith use to make jewellery ? Why ?

(3) Why is phosphorus kept in water?

(4) How is sex determined of a foetus?

(5) Write a short note : Cell nucleus.​

Answer 1

Answer:

1) Threshing-The process of removing chaf from crops.

2) Goldsmith uses outermost layer of candle to make jewellery because it is the hottest part of the flame.

3)It is stored in water to prevent exposure from air because it spontaneously ignite at the temperature of 30°.

4)It is determined by the type of chromosome it holds if it have XY chromosome then boy and XX chromosome then girl child.

5)Cell nucleus is an organelle bounded by a double membrane, which undergoes drastic reorganization during major cellular events such as cell division .