Title: Quiz 4 Corn
Course: MASTER-AGRI-1131-WB-Fairley > Section: Module 4 - Corn

The exam contains 20 multiple choices and true/false questions. Students will have one attempt and a 25 minute time limit to complete the quiz.

Q: Beginning of R5 kernels have ________ % moisture content.
- 30%
- 60%
- 70%
- 50%
A: 60%
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: At R6- Physiological Maturity the kernel moisture is about _____ %
- 35%
- 40%
- 20%
- 60%
A: 35%
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: At R4- Dough Stage- the kernels moisture is approx.  _____ %.
- 80%
- 75%
- 70%
- 45%
A: 70%
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Pollen shed will typically last __________.
- 2 weeks
- 3 weeks
- 4 days
- 1 week
A: 1 week
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: How many reproductive growth stages does a corn plant go through?
- 5
- 8
- 6
- 7
A: 6
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: All of the following except one are problems seen around the time of silking,
choose the incorrect answer:
- Corn Rootworm Adults
- Cutworm
- Foliar Diseases
- Drought
A: Cutworm
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Which of the diseases listed below does not fit.
- Goss’s Wilt
- Anthracnose Stalk Rot
- Frogeye Leaf Spot
- Gibberella Rot
A: Frogeye Leaf Spot
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: What is the last vegetative growth stage?
- R1
- VT
- V19
- V17
A: VT
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: At what growth stage do all 3 of these development keys happen: Growing point is
above the soil surface, All leaves, ear shoots, and tassel are fully formed, Ear
girth - number of rows around the ear is also determined.
- V3
- R1
- V4
- V6
A: V6
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: When the young shoot pushes through the soil surface there are many problems to
watch out for, choose the answer that does not fit.
- Common Rust
- Seed corn maggot
- Cutworm
- Flooding
A: Common Rust
If right: Your answer is correct.
If wrong: Your answer is incorrect.

Q: Corn vegetative growth stages are characterized with an R and then a number that
follows.
- True
- False
A: False

Q: The number of kernels per row is determined over a wide range of time from V12-VT.
- True
- False
A: True

Q: An ear of corn will produce anywhere from 750-1000 ovules per ear but at harvest
there will only be about 475-550 kernels per year harvested.
- True
- False
A: True

Q: During the silking growth stage, the silks are viable and receptive to pollen for at least 5 days.
- True
- False
A: True

Q: When the plant switches from vegetative to reproductive the staging is no longer
based on the appearance of the plant but the appearance of the ear.
- True
- False
A: True

Q: Black layer occurs before physiological maturity.
- True
- False
A: False

Q: Corn reproductive growth stages are characterized with an R and then a number.
- True
- False
A: True

Q: In order to stage corn plants during the vegetative stages one will use the collar
method.
- True
- False
A: True

Q: When staging corn you always count the leaf in the whorl.
- True
- False
A: False

Q: The first leaf of a corn plant has a pointed tip to the leaf.
- True
- False
A: False