E Doris James, Vandana Tirath, Anton Siromani and, Kiran Banerji Solutions for Chapter: Test Paper 1, Exercise 1: (Lessons 1-5)

Give one advantage and one disadvantage of using alcohol in a thermometer.

What would happen if a person did not produce saliva? How would digestion be affected?

Define conduction. What are the conditions needed for the transfer of heat by conduction?

What are three environmental factors essential for photosynthesis?

The graph shows the changes in the concentration of carbon dioxide measured over two years at a city in Alaska, north of the Arctic Circle. Why does the concentration fall in summer (June-August) and rise again in winter every year?

When iodine is added to a warmed test tube containing cornflour, water, and saliva, the colour of the mixture will _____.

Mr Sen wants to ensure that the workers at his sericulture facility are not affected by diseases as a result of their work. Name two things that he could provide them with to keep them safe and healthy.

A metal block A that has been heated to ${40}^{\circ } \mathrm{C}$ is made to touch metal block B that is at a temperature of ${25}^{\circ } \mathrm{C}$. Which of these statements is not true?