Human Eye and Colourful World — Science STD 10 — Question

In the modern periodic table, which are the metals among the first ten elements?

Name one organism each having saprophytic, parasitic and holozoic modes of nutrition.

What is the name of:
The curved, transparent front surface of the eye?

Write the scientific term for ‘Science of heredity and variation.’

Write the structural formula of butane.

What happens when methane (natural gas) burns in air? Write the chemical equation of the reaction involved.

What should be the minimum wind speed for the satisfactory working of a wind-powered electric generator?

A nuclear reactor has half the length of all its control rods inserted in graphite. What must be done so that the reactor produces more heat? Explain your answer.

What will be the colour of litmus in an aqueous solution of ammonium chloride salt?

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.