NATURE STUDY: BY GRADES 



LESSON LII 

 PLANTS NEED LIGHT 



Describe plants grown in a dark cellar. Bring samples of 

 sprouting onions, potatoes, cabbage, etc., or prepare before- 



hand a chalk box in which 



wheat has been planted and 

 is growing, but which has 

 been kept under a tin bucket 

 or other covering to keep out 

 the light while it has had 

 plenty of heat and water. 



Why is grass that is grown 

 under a board or other cover- 

 ing so pale and delicate? 

 Why are house plants set in 

 the window ? Which way do 

 most of their leaves turn? 

 Account for the sunflower's 



BEAN LEAVES TURNED TOWARD name. DiscUSS its habits in 

 THE WINDOW , L . ,. , , T , n 



relation to light. Why do 



flowers close at night and open in the morning? Compare 

 the grass under the low boughs of an evergreen tree on the 

 lawn with that which receives direct sunshine. 



Can you give any reason why the branches of a tree leave 

 the trunk on all sides? Is there any reason why the leaves 

 on a twig are not all attached to the same side of the twig? 

 Look at a tree or large plant and note how the branches and 

 leaves are so distributed as to get for each leaf some sunlight 

 at least once a day, as the sun passes over it from east to 

 west. 



