Fibre to Fabric — Science STD 7 — Question

Explain why there would be the chances of increase in carbon dioxide with the decrease in number of forests?

Consider the following statements
(i) Both acids and bases change colour of all indicators.
(ii) If an indicator gives a colour change with an acid, it does not give a change with a base.
(iii) If an indicator changes colour with a base, it does not change colour with an acid.
(iv) Change of colour with an acid and a base depends on the type of the indicator.
Which of the above statements is/are correct?
(a) Only (iv)
(b) (i) and (iv)
(c) (ii) (iii) and (iv)
(d) All of the above

Explain how water seeps through the surface of the Earth and gets stored as groundwater.

How can we prevent rusting?

A student frequently complains about discomfort and skin issues but shows reluctance to discuss personal habits or changes he/she is experiencing. How can unaddressed hygiene affect adolescent health? What strategies can help students manage physical changes more responsibly?

While using a toilet, Mohini noticed that used sanitary pads were scattered near the bin. She got upset and shared her feelings with her friends. They discussed the importance of menstrual hygiene and healthy sanitary habits. What menstrual hygiene and sanitary habits would you suggest to your friends?

Explain the role of chlorophyll in the process of photosynthesis.

How does baking soda help in relieving ant sting?

Describe the process of neutralisation with the help of an example.