Important Questions for CBSE (English Medium) Class 10 - CBSE - Science

A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.

In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.

A compound 'X' on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound 'Y'. 'X' also reacts with sodium metal to evolve a colourless gas 'Z'. Identify 'X', 'Y' and 'Z'. Write the equation of the chemical reaction of formation of 'Y' and also write the role of sulphuric acid in the reaction.

 Why are most carbon compounds poor conductors of electricity?

The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation or all the three attempts.

Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.

Mention any two components of blood.

Trace the movement of oxygenated blood in the body.

Write the function of valves present in between atria and ventricles.

Write one structural difference between the composition of arteries and veins.

Define excretion

Name the basic filtration unit present in the kidney.

List the steps of preparation of temporary mount of a leaf peel to observe stomata.

Name one gustatory receptor and one olfactory receptor present in human beings.

Write a and b in the given flow chart of the neuron through which information travels as an electrical impulse.

Name the hormones secreted by the given endocrine glands and specify one function.

Thyroid

Name the hormones secreted by the given endocrine glands and specify one function.

Pituitary

Name the hormones secreted by the given endocrine glands and specify one function.

Pancreas

Answer the following question.
What is pollination? Explain the different types of pollination.

Name the process by which an Amoeba reproduces. Draw the various stages of its reproduction in a proper sequence.

A Mendelian experiment consisted of breeding pea plants bearing violet flowers with pea plants bearing white flowers. What will be the result in F₁ progeny?