Factors Affecting the Variety of Species in an Ecosystem

Chapter 7

Click on a number in the grid to see the clue or clues for that number.
Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter.

1   2              3        
                   
4                     
                   
      5               
                   
6                     
                   
   7                  
                   
                   
      8     9            
                   
           10          
                   
                   
                   
   11                  
                   
                   

Across:

1. Reaction shown by an animal on being exposed to an environmental stimulus (11,8)
4. Struggle for existence between members of a community caused by the limited supply of an essential resource (11)
5. Piece of apparatus used to study the effect of differences in an environmental factor on an animal's behaviour (6,7)
6. Total variation that exists among all living things on Earth (12)
7. Complete clearing away of vast tracts of natural forest and the failure to renew them (13)
8. Inherited characteristic that makes an organism well suited to its environment (10)
10. Group of interbreeding organisms whose offspring are fertile (7)
11. Harmful form of precipitation that affects plants and animals, reducing biodiversity (4,4)

Down:

2. Role played by a species within a community (10,5)
3. Poisonous gas that harms living things and reduces biodiversity (7,7)
9. General term for contamination of the environment by harmful substances (9)