CCA - Certified Crop Advisor Crop Growth and Development Questions and Answers

Question 1

A corn producer needs to calculate the Growing Degree Days (GDDs) accumulated since planting to predict when the crop will reach the V10 growth stage.
Which of the following sets of data is essential for this calculation?

Accepted Answer

Daily maximum and minimum air temperatures

Answer

Daily solar radiation and precipitation totals

Answer

Soil temperature at planting and average wind speed

Answer

Relative humidity and the hybrid's disease resistance score

Question 2

Which of the following physiological processes is most directly responsible for creating the 'pull' that moves water from the roots up through the xylem and out of the plant's leaves?

Accepted Answer

Transpiration

Answer

Photosynthesis

Answer

Respiration

Answer

Photoperiodism

Question 3

A soybean field is subjected to a period of severe drought and heat stress. At which of the following reproductive growth stages would this stress cause the most significant yield loss, primarily through flower and pod abortion?

Accepted Answer

R3 (Beginning Pod) to R5 (Beginning Seed)

Answer

R1 (Beginning Bloom)

Answer

R7 (Beginning Maturity)

Answer

VE (Emergence)

Question 4

A wheat crop is at the Feekes 10.5.1 growth stage (beginning of flowering/anthesis) when it experiences a late spring frost of 28°F (-2°C) for several hours. What is the most likely and severe damage a CCA should look for?

Accepted Answer

Sterilization of anthers, leading to poor kernel set.

Answer

Temporary wilting of the flag leaf with full recovery expected.

Answer

Increased development of secondary tillers to compensate.

Answer

A dark green, water-soaked appearance on the lower stem.

Question 5

Soybeans are classified as short-day plants. This classification means that the initiation of flowering is primarily triggered by which environmental cue?

Accepted Answer

The length of the uninterrupted dark period exceeding a critical threshold.

Answer

A specific accumulation of Growing Degree Days.

Answer

The plant reaching a genetically predetermined height.

Answer

Soil moisture levels dropping below a certain percentage.

Question 6

In corn, the potential number of kernels per ear is a critical yield component. During which of the following developmental windows is the number of kernels per row primarily determined?

Accepted Answer

V12 to R1 (Silking)

Answer

R3 (Milk) to R5 (Dough)

Answer

VE (Emergence) to V5

Answer

R6 (Physiological Maturity) to Harvest

A corn producer needs to calculate the Growing Degree Days (GDDs) accumulated since planting to predict when the crop will reach the V10 growth stage.Which of the following sets of data is essential for this calculation?

A corn producer needs to calculate the Growing Degree Days (GDDs) accumulated since planting to predict when the crop will reach the V10 growth stage.
Which of the following sets of data is essential for this calculation?