Heredity and Evolution — Science STD 10 — Question

What happens when a ray of ordinary light is passed through a triangular glass prism?

When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what the following are examples of:
The cells in your nasal passages which perceive the smell.

What is the significance of emulsification of fats?

How is the spinal cord protected in the human body?

Can you consider cell division as a type of reproduction in unicellular organisms? Give reason.

Name a device that helps to measure the potential difference across a conductor.

Name any two defects of vision which can be corrected by using spectacles.

List any two natural ecosystems.

What is the difference between two consecutive homologues:

1. In terms of molecular mass?
2. In terms of number and kind of atoms per molecule?

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)?