Sources of Energy — Science STD 10 — Question

Potatoes grow well on Anhad’s farm which has soil with a pH of 5.5. Anhad decides to add lot of lime to soil so that he can grow broccoli in the same farm:

1. Do potatoes grow better in acidic or alkaline soil?
2. Does broccoli grow better in acidic or alkaline soil?

State the importance of chromosomal difference between sperms and eggs of humans.

Explain why:
Ionic compounds have generally high melting points.

How is a voltmeter connected in the circuit to measure the potential difference between two points?

Explain the formation of scum when hard water is treated with soap.

Untreated sewage being disposed of in waste bodies to lead to water pollution. Suggest the practices that can be included for better disposal of sewage waste.

Draw a ray diagram to show the refraction of light through a glass prism. Mark on it,

1. The incident ray,
2. The emergent ray,
3. The angle of deviation.

What are the raw materials required for making soap in a laboratory (or at home)?

What are respiratory substrates? Give one example.

If a milky of cloudy membrane grow over the eye lens, then which defect is the person suffering from?