Fibre to Fabric — Science STD 7 — Question

A rotating disc has a pencil that serves as a rotator. The disc is covered with violet, indigo, blue, green, yellow, orange and red coloured papers. When the disc is rotated, it appears white instead of the individual colours. Why?

Give an example of oscillatory motion.

Sheep are herbivores, so which type of feed (or food) is provided by shepherds?

Sunlight, chlorophyll, carbon dioxide, water and minerals are raw materials essential for photosynthesis. Do you know where they are available? Fill in the blanks with the appropriate raw materials.
Available during day: .

What are quartz clocks?

What is pollination?

Briefly mention what makes things visible to us.

What is the use of maximum and minimum thermometer?

Note the changes in shape, size or state : Making popcorn from corn

A food stall owner was preparing dough for making bhaturas. He added a pinch of yeast and sugar to the dough and left it in a warm place. After few hours, the dough had risen. There was a sour smell too. Why did the dough smell sour?