Weed ID and Control Quiz

1.Weeds are detrimental because they compete for
a. water

b. light

c. nutrients

d. all of the above.

2.  Which of the following is not a part of a grass leaf?
a. stamen

b. blade

c. ligule

d. auricle

3. A sedge can easily be identified due to its
a. minty odor

b. bright blue flowers

c. parallel veins

d. triangular stem

4. A perennial is a plant which
a. completes its life cycle in a single year

b. often spreads by both seed and vegetative structures

c. never forms a taproot

d. is very easy to control

5. Which of the following will not influence the biotic triangle for weeds?
a. type of plants grown in the garden bed or landscape

b. presence of the pest organism

c. availability of thinning turf or bare ground

d. favorable environmental factors

6.  A contact herbicide is normally not effective against established perennial weeds because:
a. the chemical only kills germinating seedlings

b. perennials are able to rapidly degrade the herbicide

c. perennials have a small root system that is difficult to kill

d.  the chemical will not move into the root system

7.  A plant with a biennial life cycle will
a. continue to grow year after year, indefinitely.

b. complete their life cycle in two seasons.

c. dies after 1 season.

d. none of the above.

8. Which of the following might cause a preemergence herbicide to fail to control weeds?
a. application after weeds have become established

b. failure to adjust rate to soil type

c. lack of rainfall or moisture after application

d. all of the above

9. Herbicides are not used very often in home gardens because
a. all herbicides cannot be used on food crops

b. of the large variety of crops grown in a small area

c. weeds are beneficial to vegetables

d. they are too expensive

10. A non-selective herbicide would be best suited for controlling
a. dandelions growing in turf

b. weeds in cracks of a driveway

c. perennial weeds in a garden

d. annual weeds in ornamental plants