life processes — Science STD 10 — Question

What are the functions performed by the testis in human beings?

Explain translocation of sugar in the spring season in plants.

What is the focal length of plain goggles?

Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

Which ions are responsible for acidic and basic properties of the solution?

Absolute refractive index of carbon disulphide is 1.63. Then, explain this statement in context to speed of light.

Name the solution which is used for dissolving gold.

List two methods of producing magnetic fields.

Where should an object be placed in order to use a convex lens as a magnifying glass?

What is the essentiality of nitrogen element?