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Name: 
 

Importance of Plants



Completion
Complete each sentence or statement.
 

 1. 

____________________ host bacteria that fix nitrogen, or convert it to a form that plants can use.
 

 

 2. 

____________________ is the world’s most widely used plant fiber.
 

 

 3. 

Flowers that are large and colorful are most often pollinated by ____________________.
 

 

 4. 

Carbohydrates are stored in ____________________ crops, making such crops an important source of calories for human populations.
 

 

 5. 

Foods derived from the leaves, stems, seeds, and roots of plants are often called ____________________.
 

 

 6. 

Plants absorb ____________________ from the air and release ____________________ into the air.
 

 

 7. 

Chestnut blight, which has wiped out American chestnut trees in many parts of the eastern United States, is caused by a(n) ____________________ that was introduced into the country.
 

 

 8. 

Growing plants and raising animals for use by people is called ____________________.
 

 

 9. 

Water pollution can result from the use of ____________________ and fertilizers in agriculture, because these chemicals can be washed off farmland by rain and end up in drinking-water reserves.
 

 

 10. 

The planting of legumes is useful in crop rotation because they supply ____________________ to the soil.
 

 

 11. 

Plants, such as soybeans, that produce protein-rich seeds in long pods are called ____________________.
 

 

 12. 

____________________ are types of plants, such as McIntosh apples, that have been selected for a particular characteristic.
 

 

 13. 

The fruits of cereal plants such as rice, corn, and oats are called ____________________.
 

 

 14. 

Salicin is an extract of willow bark and is used in the production of ____________________.
 

 

 15. 

An allergic reaction to some types of pollen is known as ____________________.
 

 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 16. 

A farmer alternately grows corn and a legume crop in a single field. The farmer’s reason for doing this is probably
a.
to get twice as much productivity out of a single piece of land.
b.
to satisfy the changing needs of the consuming public.
c.
to create a varied and more attractive landscape.
d.
to allow the legumes to restore nitrogen to the soil that is depleted by the corn.
 

 17. 

Which of the following is not made from plant products?
a.
cork
c.
leather
b.
rubber
d.
cotton
 

 18. 

Fruits of cereal plants are called
a.
grains.
c.
legumes.
b.
tubers.
d.
vegetables.
 

 19. 

Approximately when did the cultivation of plants begin?
a.
11,000 years ago
c.
1,100 years ago
b.
55,000 years ago
d.
110,000 years ago
 

 20. 

Mycorrhizae are
a.
symbiotic associations between the roots of a plant and a fungus.
b.
symbiotic associations between the roots of a plant and a bacterium.
c.
associations between the roots of a plant and a fungus in which the fungus benefits but the plant neither receives a benefit nor is harmed.
d.
symbiotic associations between the stems and leaves of a plant and a bacterium.
 

 21. 

An example of a plant and an animal that have evolved together is
a.
an insect consuming leaves of a flowering plant.
b.
an insect obtaining nectar from a flower.
c.
a plant flower that resembles the female of an insect species.
d.
an insect carrying pollen from one plant to another.
 

 22. 

A beneficial relationship between a plant and a bacterium occurs when certain bacteria inhabit the roots of a plant and ____ that the plant can use.
a.
fix nitrogen
c.
absorb minerals
b.
absorb water
d.
fix carbon
 

 23. 

Plant ecology is the study of the interaction between plants and
a.
microorganisms and animals.
b.
bacteria, fungi, and animals.
c.
animals.
d.
the environment.
 

 24. 

All of the following foods come from fruits except
a.
spinach.
c.
rice.
b.
wheat.
d.
applesauce.
 
 
impt_of_plants_files/i0270000.jpg
 

 25. 

Refer to the illustration above. The plant that is highest in protein content is plant
a.
1.
b.
3.
c.
2.
d.
None of them; all plants are high in carbohydrates but very low in protein.
 

 26. 

Refer to the illustration above. Which plant would contain nitrogen-fixing bacteria?
a.
3
b.
2
c.
1
d.
None of them would contain nitrogen-fixing bacteria.
 

 27. 

rice and corn : cereal grains ::
a.
carrots and cassava : roots
b.
wheat and corn : roots
c.
beets and wheat : leaves
d.
turnips and radishes : stems
 

 28. 

Plants used to make fibers for clothing include
a.
tannin.
c.
flax.
b.
cotton.
d.
Both b and c
 

 29. 

Which of the following plant products can be harmful if eaten?
a.
oregano
c.
artichokes
b.
gum arabic
d.
holly berries
 

 30. 

Which of the following associations between an agricultural practice and its description is incorrect?
a.
use of fertilizers—supplementation with mineral nutrients
b.
use of cultivars—harvesting the highest yielding or highest quality plants
c.
use of pesticides—control of insects and microorganisms
d.
use of irrigation—supplementation with water
 

 31. 

People have damaged natural plant populations by introducing
a.
foreign plant species that become noxious weeds.
b.
diseases that kill native plants.
c.
animals that consume native plants.
d.
All of the above
 

 32. 

salicin : white willow ::
a.
cortisone : foxglove
b.
taxol : yew trees
c.
quinine : sweet potatoes
d.
digitalis : willow trees
 

 33. 

Vegetables that we eat come from various plant parts including
a.
stems.
c.
leaves.
b.
roots.
d.
All of the above
 



 
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