Final Exam Review - Hort 173

Question 1

What is the likely impact on the flow rate of a pump as the head height increases in a hydroponics system?

Accepted Answer

It decreases gradually

Question 2

How does UV-B wavelength impact plants?

Accepted Answer

Stimulates anthocyanins for UV protection

Question 3

How is head height defined in the context of a hydroponics pump?

Accepted Answer

The vertical distance from the water level to the pump

Question 4

When should a decision to use a pesticide be made in pest management?

Accepted Answer

When the pest population has reached or exceeded the economic threshold

Question 5

What does the practice of fallow involve?

Accepted Answer

Scheduling breaks between crops

Question 6

What are the two methods for post-plant fertilization?

Accepted Answer

Constant liquid fertilization and scheduled fertilization

Question 7

What is the mode of action of Diatomaceous Earth in controlling pests?

Accepted Answer

Abrasive properties damage the exoskeleton of insects

Question 8

What is the primary purpose of buffer solutions in hydroponics?

Accepted Answer

To stabilize and resist changes in pH

Question 9

Why might foliar fertilization be useful when plants are stressed or show nutrient deficiencies?

Accepted Answer

rapid nutrient utilization

Question 10

Plant spacing might need to be adjusted in winter.

Accepted Answer

True

Question 11

What is a key characteristic of LED technology in greenhouse lighting?

Accepted Answer

Low heat emission

Question 12

What is nutrient lockout, and how does it occur in hydroponic systems?

Accepted Answer

precipitation of dissolved nutrients

Question 13

How does Neem Oil (Azadirachtin) disrupt the growth and development of insects?

Accepted Answer

By affecting feeding and reproduction

Question 14

Which hydroponic method relies on a passive sub-irrigation to draw nutrient solution to the plant roots?

Accepted Answer

Wicking System

Question 15

What is a drawback of foliar applications for macronutrients?

Accepted Answer

ineffective for macronutrients

Question 16

In an NFT system, what is the role of the growing channels?

Accepted Answer

To create a slope for nutrient flow

Question 17

What is the primary purpose of utilizing sticky cards ?

Accepted Answer

monitor flying insect pests

Question 18

What is a common characteristic of most biorationals in terms of pest population control?

Accepted Answer

Slow acting, suppressing rather than eliminating

Question 19

This is the simplest passive form of hydroponics

Accepted Answer

Kratky Method

Question 20

During the flooding phase in Ebb and Flow, where do plant roots typically receive nutrient solution?

Accepted Answer

Through capillary action in the growing medium

Question 21

Which color of sticky traps is primarily used to attract thrips

Accepted Answer

blue

Question 22

Before filling a hydroponic system why should you let the tap water air out overnight?

Accepted Answer

To allow chlorine to dissipate.

Question 23

How often is a weekly monitoring program recommended for most greenhouse situations?

Accepted Answer

Weekly

Question 24

What nutrient will be leached at a low pH

Accepted Answer

P

Question 25

Which pH adjuster is typically used to raise the pH in hydroponic nutrient solutions?

Accepted Answer

Potassium hydroxide (KOH), Sodium hydroxide (NaOH)

Question 26

What is the primary focus of cultural pest control?

Accepted Answer

Altering a pest's habitat

Question 27

What is the primary function of a submersible pump in a hydroponics system?

Accepted Answer

Circulation of water and nutrients

Question 28

When is foliar fertilization most successful?

Accepted Answer

When micronutrient deficiencies are observed

Question 29

Which unit is used to measure Quantum Light or PAR accurately?

Accepted Answer

µmol/m²/s

Question 30

When is the use of traditional pesticides justified in pest management?

Accepted Answer

When all other IPM tactics fail to keep pest below ET

Question 31

What does the practice of rouging?

Accepted Answer

Removing pests by handpicking

Question 32

What term is often used to describe biorationals in pest management?

Accepted Answer

Soft or reduced-risk pesticides

Question 33

What nutrients will be deficient at a high pH

Accepted Answer

Fe, Zn

Question 34

What is the economic injury level (EIL) in pest management?

Accepted Answer

When the economic loss is equal to the cost of controlling the pest

Question 35

What does DLI take into account in assessing a plant's light environment?

Accepted Answer

Both light intensity and duration

Question 36

Which type of hydroponic system uses a floating raft allowing the roots to dangle into the nutrient solution

Accepted Answer

DWC

Question 37

When it is hot you should increase the Ec of the nutrient solution in hydroponics

Accepted Answer

False

Question 38

Which fertilizer type has a high salt index and potential acidity?

Accepted Answer

Inorganic fertilizers

Question 39

What is the primary advantage of the Ebb and Flow system for plant roots?

Accepted Answer

Improved aeration during the draining phase

Question 40

What is the range for photomorphogenesis in terms of wavelength?

Accepted Answer

320 – 800 nm

Final Exam Review - Hort 173

Questions 40

Final Exam Review - Hort 173

Questions 40