Agronomy Crop Physiology 2

Question 1

What is the water potential of pure water at standard conditions?

Accepted Answer

0 MPa

Answer

Pure water has a water potential of 0 MPa by definition; adding solutes lowers water potential below zero, driving water movement into cells via osmosis.

Question 2

Which photosynthetic adaptation allows cacti and pineapples to open their stomata at night to fix CO2?

Accepted Answer

CAM photosynthesis

Answer

Crassulacean Acid Metabolism (CAM) allows desert plants to open stomata at night, storing CO2 as malic acid, then using it for photosynthesis during the day with stomata closed to minimize water loss.

Question 3

What is vernalization in crop production?

Accepted Answer

A period of cold temperature exposure required to induce flowering

Answer

Vernalization is the process by which prolonged exposure to cold temperatures promotes flowering in certain crops, such as winter wheat, allowing them to flower in spring.

Question 4

What is the primary function of xylem tissue in crop plants?

Accepted Answer

Transport of water and minerals from roots to shoots

Answer

Xylem is the vascular tissue that conducts water and dissolved minerals upward from the roots to the rest of the plant through lignified, hollow dead cells.

Question 5

Which plant hormone promotes seed germination, stem elongation, and is applied commercially to increase grape berry size?

Accepted Answer

Gibberellin

Answer

Gibberellins promote stem elongation, seed germination, and fruit set; commercial applications to grapes increase berry size and are used to produce seedless varieties.

Agronomy Practice Test

Agronomy Practice Test

Agronomy Crop Physiology 2