Wastewater Story — Science STD 7 — Question

What does sonorous mean?

A leguminous plant can restore the soil’s concentration of mineral nutrients. Can you give examples of some such plants?

Trisha has seen huge garbage dumps outside the school campus which are not being regularly disposed off by municipality of the area. She discussed the problem with her biology teacher and decided to organise a rally to spread awareness among local people. Next day she delivered this information in the assembly and convinced the school mates to join her. She also explained them about the importance of sanitation at public places which she had recently studied in biology.
(i) In your views, who is responsible to maintain sanitation at public places?
(ii) What would happen, if all the wastes produced at public places are not disposed off regularly?

Have you ever seen an electrician using a screwdriver? What type of material is used for making its handle?

What is the purpose of filtering waste water?

The mercury does not fall or rise in a clinical thermometer when taken out of the mouth. Explain why?

Formation of new but similar individuals from parents is characteristic feature of which process?

Which layer of soil is rich in fauna?

Suppose you are given a tube of the shape shown in the Fig. and two plane mirrors smaller than the diameter of the tube. Can this tube be used to make a periscope? If yes, mark where you will fix the plane mirrors.

Write the name of the animal from which wool for pashmina shawls is obtained.