English Medium Class 9 - CBSE Question Bank Solutions for Science

Cork cells possesses ______ on their walls that makes it impervious to gases and water.

Cells of cork contain a chemical called ______

Draw well labelled diagrams of various types of muscles found in human body.

Which among the following has specialised tissue for conduction of water?

1. Thallophyta
2. Bryophyta
3. Pteridophyta
4. Gymnosperms

Thallophyta, bryophyta and pteridophyta are called as ‘Cryptogams’. Gymnosperms and Angiosperms are called as ‘phanerogams’. Discuss why? Draw one example of Gymnosperm.

What is an antibiotic? Give two examples

Name any two groups of micro-organisms from which antibiotics could be extracted.

Name any three diseases transmitted through vectors.

Explain giving reasons

A balanced diet is necessary for maintaining a healthy body.

Why do some children fall ill more frequently than others living in the same locality?

Which of the following is not a greenhouse gas?

Top-soil contains the following

A major source of minerals in the soil is the

Soil erosion can be prevented by

How can we prevent the loss of topsoil?

Following are a few organisms

(a) lichen (b) mosses (c) mango tree (d) cactus Which among the above can grow on stones; and also help in the formation of soil? Write the mode of their action for making soil.

Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic?

Lichens are called pioneer colonisers of bare rock. How can they help in the formation of soil?

“Soil is formed by water.” If you agree to this statement then give reasons

Fertile soil has lots of humus. Why?