What do you understand by excretion? 

Which of the things in the following list are non-living?

Plough, mushroom, sewing machine, radio, boat, water hyacinth, earthworm.

Which of the non-living things listed below, were once part of a living thing?  

Butter, leather, soil, wool, electric bulb, cooking oil, apple, rubber.

Draw a labelled diagram of stomata. What is its importance for plants? 

Explain with an example - what is meant by 'living things respond to stimuli'?   

All living beings take in oxygen. What function does oxygen perform in the body?   

Are you an autotroph or a heterotroph? Explain why? 

How is fish adapted for aquatic life?