OLED SEVEN
Test V - Read and understand the questions very carefully. Circle the letter of the correct
answer.
18. Which of the following is a pollutant in the air
a. oxygen
b. sulfur dioxide
c. nitrogen d. carbon dioxide
19. Why do organisms need space?
a. Dvercrowded areas lead to starvation and disease.
b. It gives time among organisms to take enough foods.
c. It provides energy and nutrients necessary to the body to perform life functions.
d. It transports nutrients and wastes in the body, and it helps keep body temperatures
constant.
20. Why is sunlight very important to the ecosystem
a. It is needed when plants make food.
b. Sunlight makes us see things around.
c. Oxygen is produced when there is sunlight
d. Makes water become warm.
21. What vitamin is responsible for the proper development of bones and teeth, and is
released by the body with the help of sunlight.
a. Vit A
b. Vit E
c. Vit C
d. Vit D
22. What component does air have that is essential for living things to survive?
a. ammonia
b. nitrogen
c. oxygen
d. carbon dioxide
23. What makes our air polluted?
a. Cutting of trees in the forests.
b. Use of electric appliances at home.
c. Spraying the farms with pesticides to kill the pests.
d. Burning of gasoline and diesel by vehicles and factories.
24. In what way air pollution affects the plants
a. Slow down the growth of the plants.
b. Makes plant good for animals to eat.
c. Source of organic fertilizer for the plants.
d. Protects the plants from being eaten by the animals.
25. Which of the following will NOT be the result of overcrowding?
a. Diseases spread easily.
b. Organisms grow very healthy.
c. Resources will be in limited supply.
d. There is equal sharing of resources. Vi