English Medium Class 9 - CBSE Question Bank Solutions for Science

 Distinguish between prokaryotic and enkaryotic cells

A bus moving along a straight line at 20 m/s undergoes an acceleration of 4 m/s². After 2 seconds, its speed will be:

What are simple tissues? Explain their three different types.

Draw a well labelled diagram of parenchyma and collenchyma.

Draw a well labelled diagram of phloem.

Draw a well labelled diagram of xylem.

Give two functions of collenchyma.

Write a short note on sclerenchyma.

Distinguish between tracheids and vessels.

Explain different types of elements present in phloem.

What are tracheary elements? Describe their functions.

Write the functions of parenchyma, collencyma and sclerenchyma.

What is the difference between parenchyma and collenchyma?

What is the differences between collenchyma and sclerenchyma?

Name the different types of elements found in the xylem.

What are the functions of xylem?

What are the functions of phloem?

Explain how sieve tubes manage to be living?

The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.

1. Name the substances (i) X (ii) Y and (iii) Z.
2.  What is the process of conversion of X into Y known as ?
3. At which temperature X gets converted into Y ?
4. What is the process of conversion of X into Z known as ?
5. At which temperature X gets converted into Z ?