English Medium Class 9 - CBSE Question Bank Solutions for Science

Compare the use of manure and fertilizers in maintaining soil fertility.

Why are manures and fertilizers used in fields?

What are the advantages of inter-cropping?

What is the value of gravitational constant G (i) on the earth, and (ii) on the moon ?

State whether the following statement is true or false :

The value of G on the moon is about one-sixth `(1/6)`of the value of G on the earth.

Fill in the following blank with suitable word :

The value of g on the earth is about………………. of that on the moon.

Is the acceleration due to gravity of earth ‘g’ a constant ? Discuss.

What is the physical state of water at 100°C.

Distinguish between micronutrients and macronutrients. Give suitable examples.

Classify nutrients according to their sources.

Name the process by which a drop of ink spreads in a beaker of water.

How plants get nutrients ?

Name three most important nutrients required for plant growth.

Choose plant’s micronutrients and macronutrients from the following Iron, Chlorine, Sulphur, Copper, Nitrogen, Calcium, Manganese, Potassium, Zinc, Magnesium, Molybdenum, Phosphorus.

 What are advantages of using manure ?

'A substance has definite volume but no definite shape'. State whether this substance is a solid, a liquid or a gas.

Give two limitations of using manure.

Compare the use of manures and fertilizers in maintaining soil fertility.

Write down two advantages of fertilizer over manure

During the downpour in a village, the rain water carried away excess of nitrogenous and other compounds present in the soil to a pond. How will they affect the growth of algae and phytoplankton in the pond ?