Student as Teacher Project Kahoot. 3B

Which is a way to classify herbicides?

• By soil color

• By mode of action

• By weed leaf shape

• By climate

Herbicides can also be classified by:

• Soil type and rainfall

• Irrigation method only

• Chemical family and application timing

• Crop color and planting date

What does 'mode of action' mean?

• How a herbicide looks on leaves

• How a herbicide mixes with fertilizer

• How a herbicide disrupts plant growth or physiology

• How a crop resists pests

Why is mode of action important?

• Prevents resistance and improves weed control planning

• Increases rainfall

• Helps reduce fertilizer use

• Makes herbicides cheaper

Propanil (an amide) acts by:

• Disrupting lipid synthesis

• Mimicking auxin

• Inhibiting photosystem II

• Inhibiting EPSPS enzyme

Paraquat and diquat (bipyridiliums) act by:

• Blocking photosystem II

• Inhibiting fatty acid synthesis

• Inhibiting ALS enzyme

• Diverting electrons from photosystem I

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Trifluralin and pendimethalin (dinitroanilines) act by:

• Inhibiting microtubule assembly

• Blocking photosystem II

• Mimicking auxins

• Inhibiting glutamine synthetase

Tags

NGSS.HS-PS1-2

Oxyfluorfen (diphenylether) acts by:

• Blocking amino acid synthesis

• Mimicking auxin hormones

• Causing cell membrane disruption

• Inhibiting DNA synthesis

Glyphosate (glycine) acts by:

• Blocking Photosystem I

• Inhibiting ACCase enzyme

• Blocking Photosystem II

• Inhibiting EPSPS enzyme

2,4-D (phenoxy carboxylic acid) acts by:

• Inhibiting glutamine synthetase

• Mimicking auxin hormones

• Disrupting cell membranes

• Blocking photosystem II