Agronomy Written Test Questions And

Agronomy Written Test Questions And Answers Latest 2024/25 RATED A+

Who is given credit for discovering that soybeans were an excellent source of protein and oil and for encouraging farmers to rotate their crops with soybeans? - George Washington Carver

What term is used to describe fine brown or gray hairs on the leaves, stems, and pods of soybeans? - pubescence

Which of the following is a true statement regarding soybeans? - Soybeans are generally considered a source of complete protein.

The top 2 states in terms of soybean production? - Iowa and Illinois

A (n) is a plant that can fix nitrogen from the air in the soil - legume

Living organisms that cause disease are often referred to as . - pathogens

Which of the following is a benefit of integrated pest management? - reduced pesticide costs

Economic injury level is . - the point at which the cost of pest control equals the revenue loss caused by a pest

Which method of pest control involves making the crop environment unsuitable for pests to feed, live, or reproduce? - cultural

What are used to kill unwanted plants? - herbicides

What is caused by environmental imbalances and cannot be spread to other plants? - noninfectious disease

What are the three components of the disease triangle? - a susceptible host, a causal agent, and environmental conditions

What are the principle causes of most diseases that affect agricultural crops? - Fungi

Which of the following is a cultural/physical method used to manage pest populations?

• removing and destroying infected plants

What is a pathogen? - a living, disease-producing agent

Optimum care of plants through irrigation and fertilization reduce weed, disease, and insect problems. Which type of disease control measure do these represent? - cultural

Use of beneficial predatory insects is an example of which type of pest control? - biological

Why is the implementation of an IPM program beneficial to the environment? - There is reduced contamination and degradation of soil and water.

A grower notices that a crop displays yellow streaking and stunted growth and identifies the problem as virus-related. How would this type of disturbance be classified? - infectious diseaseinfectious disease

What is a tiny, hair-like roundworm that feeds on the roots of plants? - nematode

What is a main objective of cultural control of plant pests? - maintaining healthy plants by providing optimal growing conditions

What is the first step in choosing an insecticide for pest control? - properly identify the pest

What is a nonselective herbicide? - one that will kill any plant with which it comes in contact

are absorbed by the roots or other plant parts and moved throughout the plant by vascular tissues - Translocated herbicides

Dicot plant weeds including dandelions, ground ivy, plantain, and spurge are called . - broadleaf weeds

What describes biological weed control? - control uses insects, diseases, predators, or other plants that are harmful to weeds without causing damage to crops

What type of weed is injurious to crops, people, or livestock? - noxious What type of pesticide is used to kill unwanted plants? - herbicides A farmer wants to eliminate ragweed and pigweed that are competing with corn in a field. What type of herbicide should she use? - a selective herbicide

What classification of herbicides is applied before the weeds and/or crop emerges, but after the crop has been seeded? - preemergent herbicides

What refers to how herbicides kill weeds, such as, seedling growth inhibitors and photosynthesis inhibitors? - mode of action

What is the most effective herbicide to use on stubborn perennial weeds such as Canadian thistle that have extensive rhizomes from which new shoots emerge? - systemic

Annual grasses and small-seeded broadleaf weeds can be controlled in sunflower crops by applying the herbicide before the sunflower is seeded. How would this treatment be classified? - pre-plant

How do annual weeds reproduce? - sexually

Why do contact herbicides have limited effectiveness on perennial weeds with underground storage organs? - They only kill the plant tissue with which they come in contact.

Unclean crop seed may contain weed seed and may be planted along with the crop seed. How is this process categorized? - artificial weed dispersal

What is the best reason why weeds are controlled in agricultural fields? - Weed populations compete with crops or pasture for water, nutrients, light, and space.

Nymphs are associated with . - incomplete metamorphosis

What type of mouthparts do insects that cut, tear, crush, and chomp leaves, stems, roots, flowers, and fruit have? - Chewing

What type of insect management is accomplished with the physical removal or exclusion of insect pests? - mechanical

Which family of insecticides includes plant toxins such as, caffeine, nicotine, pyrethrum, and rotenone and bacterial diseases including Bacillus thuringiensis? - biologicals

How does a contact insecticide enter an insect's body? - It is absorbed through the exterior of an insect

Why would a vegetable grower want to avoid using a systemic pesticide? - The pesticide could find its way into the plant organs that are eaten.

How does a fumigant insecticide enter an insect's body? - It enters the respiratory system of the insect.

An agronomist has identified evidence of insects devouring the leaves of a crop. What would be the most effective means of control? - a stomach insecticide

What provides protection and support for the insect? - exoskeleton

The corn earworm is the most destructive insect pest of corn in the United States.Which stage of the insect's metamorphosis causes the most damage? - larva

An insect, such as the grasshopper, undergoes incomplete metamorphosis. What process allows the insect to continually grow to reach a mature size? - molting

Why is an insect pest's feeding habit important? - It can determine the best method of control.

Which method of insect control is the most likely to cause environmental damage? - chemical

Which group of insecticides including DDT and dicofol are highly toxic and are very dangerous because they are absorbed by the fatty tissue of animals? - organochloride

A grower faced a situation where a pest appeared to be eliminated from a field, and after a few weeks the pest repopulated the field. What is the best explanation for how this occurred? - pest resurgence

What is a pathogen? - a living, disease-producing agent

What are the most common causes of infectious plant diseases? - fungi

A is an organism that benefits from a prolonged association with another organism or host. - parasite

How is the incubation phase of plant disease progression defined? - a period during which the pathogen develops a form that can penetrate or infect the new host plant

A susceptible host plant, a disease-producing agent, and a favorable environment are associated with . - the disease triangle

What is caused by environmental imbalances and cannot be spread to other plants? - noninfectious disease

What is a career title for a professional who specializes in plant health and agents that cause plant diseases? - plant pathologist

The disease triangle consists of . - a susceptible host, a causal agent, and environmental conditions