Forests : Our Lifeline — Science STD 7 — Question

Table : Testing the nature of samples with turmeric paper

Name of the Sample	The colour of the turmeric paper after putting a drop of sample
Lemon juice	Yellow
Soap solution	Red
Amla juice	Yellow
Baking, soda solution	Red
Sugar solution	Yellow

Name two useful products formed after wastewater treatment.

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?

What is the fuse rating in the lighting and fans circuit of a small house?

Give the formulae for percolation rate.

Usually veins carry deoxygenated blood except in one case. Specify.

What is the function of bile?

Do all objects radiate heat?

What are villi? What is their location and function?

Do all the seven days have same maximum and minimum temperatures, humidity and rainfall?