English Medium Class 9 - CBSE Question Bank Solutions for Science

Which one of the following species of the honey bee is an Italian species?

Which one of the following nutrients is not available in fertilizers?

Group the following and tabulate them as energy-yielding, protein yielding, oil yielding and fodder crop.

Wheat, rice, berseem, maize, gram, oat, pigeon gram, sudangrass, lentil, soybean, groundnut, castor and mustard.

Rabi crops are cultivated from ______to______.

Paddy, maize, green gram and black gram are ______ crops.

Wheat, gram, pea, mustard are ______ crops.

A total of ______ nutrients are essential to plants.

______ and ______ are supplied by air to plants.

______ is supplied by water to plants.

______ nutrients are needed in small quantity for plants and are called ______.

An Italian bee variety A. mellifera has been introduced in India for honey production. Write about its merits over other varieties.

Why beekeeping should be done in good pasturage?

Discuss why pesticides are used in very accurate concentrations and in a very appropriate manner?

What type of mixtures is separated by the technique of crystallization?

If number of electrons in an atom is 8 and number of protons is also 8, then 

1. What is the atomic number of the atom? and
2. What is the charge on the atom?

With the help of given Table, find out the mass number of oxygen.

With the help of given Table, find out the mass number of sulphur atom.

Explain the Atomic number with example.

Explain the Mass number with example.

The composition of the nuclei of two atomic species X and Y are given as under

Give the mass numbers of X and Y. What is the relation between the two species?