Question 1

Organophosphorus pesticides are generally less ________ than DDT.

Accepted Answer

A) potent 
B) insect resistant 
C) persistent 
D) fat soluble 
A) potent 
B) insect resistant 
C) persistent 
D) fat soluble

Question 2

The LD₅₀ for aldicarb in rats is 1 mg per kg of body mass.Assuming that the LD₅₀ is the same for humans,how much aldicarb would it take to kill an 80 kg person?

Accepted Answer

A) 2 mg 
B) 80 mg 
C) 160 mg 
D) 1600 mg 
A) 2 mg 
B) 80 mg 
C) 160 mg 
D) 1600 mg

Question 3

Which of the following statements about humus is NOT correct?

Accepted Answer

A) Humus aids in water retention. 
B) Humus both increases the loss of nutrients through leaching and increases erosion. 
C) Humus is a dark-colored material consisting of partially decayed plant or animal matter. 
D) Humus provides a good environment for earthworms. 
A) Humus aids in water retention. 
B) Humus both increases the loss of nutrients through leaching and increases erosion. 
C) Humus is a dark-colored material consisting of partially decayed plant or animal matter. 
D) Humus provides a good environment for earthworms.

Question 4

Which of the following types of compounds do NOT accumulate in fatty tissues?

Accepted Answer

A) carbamates 
B) chlorinated hydrocarbons 
C) organic phosphorus compounds 
D) All of the above accumulate in fatty tissues. 
A) carbamates 
B) chlorinated hydrocarbons 
C) organic phosphorus compounds 
D) All of the above accumulate in fatty tissues.

Question 5

A phosphorus-containing pesticide is

Accepted Answer

A) aldicarb. 
B) diazinon. 
C) methoprene. 
D) paraquat. 
A) aldicarb. 
B) diazinon. 
C) methoprene. 
D) paraquat.

Question 6

Organophosphates and chlorinated hydrocarbons have both been used as insecticides.Which of the following statements about these two types of compounds is true?

Accepted Answer

A) Chlorinated hydrocarbons break down faster in the environment than organophosphates do. 
B) Organophosphates break down faster in the environment than chlorinated hydrocarbons do. 
C) Chlorinated hydrocarbons and organophosphates both break down very quickly in the environment and at about the same rate. 
D) Chlorinated hydrocarbons and organophosphates both break down very slowly in the environment and at about the same rate. 
A) Chlorinated hydrocarbons break down faster in the environment than organophosphates do. 
B) Organophosphates break down faster in the environment than chlorinated hydrocarbons do. 
C) Chlorinated hydrocarbons and organophosphates both break down very quickly in the environment and at about the same rate. 
D) Chlorinated hydrocarbons and organophosphates both break down very slowly in the environment and at about the same rate.

Question 7

In 1957,Clear Lake in California was sprayed with DDT such that the water contained 0.02 ppm of DDT.After a period of time,fish in the lake were found to have DDT levels as high as 2000 ppm.This is an example of

Accepted Answer

A) biological magnification of DDT. 
B) species resistance to DDT. 
C) natural decomposition of DDT. 
D) species tolerance of DDT. 
A) biological magnification of DDT. 
B) species resistance to DDT. 
C) natural decomposition of DDT. 
D) species tolerance of DDT.

Question 8

Which of the following is the least expensive method of controlling insects?

Accepted Answer

A) carbamates 
B) juvenile hormones 
C) pheromones 
D) sterile insects 
A) carbamates 
B) juvenile hormones 
C) pheromones 
D) sterile insects

Question 9

Paraquat is an example of a ________ herbicide.

Accepted Answer

A) narrow spectrum 
B) broad spectrum 
C) preemergent 
D) postemergent 
A) narrow spectrum 
B) broad spectrum 
C) preemergent 
D) postemergent

Question 10

Which insecticide was first used by Allied soldiers to combat lice,ticks and mosquitos during World War II?

Accepted Answer

A) DDT 
B) carbofuran 
C) nicotine 
D) acetic acid 
A) DDT 
B) carbofuran 
C) nicotine 
D) acetic acid

Question 11

A compound that causes leaves to fall off plants is a(n)

Accepted Answer

A) insecticide. 
B) defoliant. 
C) herbicide. 
D) pesticide. 
A) insecticide. 
B) defoliant. 
C) herbicide. 
D) pesticide.

Question 12

Praying mantises and ladybugs are predatory insects and will destroy many garden pests.

Accepted Answer

A) True 
 B)False

Question 13

A worker at an experimental agricultural station spills a substance on her lab coat.The next morning her lab coat is covered with sex crazed moths.The spilled substance was probably

Accepted Answer

A) fertilizer. 
B) DDT. 
C) juvenile hormone. 
D) a pheromone. 
A) fertilizer. 
B) DDT. 
C) juvenile hormone. 
D) a pheromone.

Question 14

Which of the following statements about early societies is NOT true?

Accepted Answer

A) One unit of human energy could produce up to ten units of food energy. 
B) Most of the energy came from renewable resources. 
C) Early agricultural practices rapidly depleted nutrients in the soil. 
D) A portion of the energy from food was invested in shelter and clothing. 
A) One unit of human energy could produce up to ten units of food energy. 
B) Most of the energy came from renewable resources. 
C) Early agricultural practices rapidly depleted nutrients in the soil. 
D) A portion of the energy from food was invested in shelter and clothing.

Question 15

Identify the compound that is NOT a pesticide.

Accepted Answer

A) carbaryl. 
B) atrazine. 
C) cryolite. 
D) boric acid. 
A) carbaryl. 
B) atrazine. 
C) cryolite. 
D) boric acid.

Question 16

Which of the following statements best describes the land available world-wide for increasing farming and food production?

Accepted Answer

A) Only about 50% of the world's arable land is currently being used for agriculture. 
B) The amount of land available for growing food is decreasing, because some land has been converted to producing crops that can be used to make biofuels. 
C) Increased efficiency will allow us to quadruple our food production in the next 25 years. 
D) Converting more acres to organic farming practices will result in a large increase in food production. 
A) Only about 50% of the world's arable land is currently being used for agriculture. 
B) The amount of land available for growing food is decreasing, because some land has been converted to producing crops that can be used to make biofuels. 
C) Increased efficiency will allow us to quadruple our food production in the next 25 years. 
D) Converting more acres to organic farming practices will result in a large increase in food production.

Question 17

Green plants are the ultimate source of our food.Which of the following statements about the source of the raw materials that plants incorporate into food is NOT correct?

Accepted Answer

A) Sunlight provides the plant with energy to convert carbon dioxide and water into sugars. 
B) Plants obtain carbon, hydrogen and oxygen from air and water. 
C) Plants obtain molecular oxygen from the air and incorporate it into sugars. 
D) Plants obtain nutrients such as trace metals from the soil. 
A) Sunlight provides the plant with energy to convert carbon dioxide and water into sugars. 
B) Plants obtain carbon, hydrogen and oxygen from air and water. 
C) Plants obtain molecular oxygen from the air and incorporate it into sugars. 
D) Plants obtain nutrients such as trace metals from the soil.

Question 18

The three primary plant nutrients are

Accepted Answer

A) phosphorus, nitrogen and calcium. 
B) phosphorus, potassium and nitrogen. 
C) magnesium, phosphorus and nitrogen. 
D) calcium, potassium and magnesium. 
A) phosphorus, nitrogen and calcium. 
B) phosphorus, potassium and nitrogen. 
C) magnesium, phosphorus and nitrogen. 
D) calcium, potassium and magnesium.

Question 19

A preemergent herbicide should be applied to fields when seedlings are at least six inches high.

Accepted Answer

A) True 
 B)False

Question 20

What does 20-5-15 on a bag of fertilizer mean?

Accepted Answer

The answer of What does 20-5-15 on a bag of...

Exam 20: Chemistry Down on the Farm

Organophosphorus pesticides are generally less ________ than DDT.

The LD₅₀ for aldicarb in rats is 1 mg per kg of body mass.Assuming that the LD₅₀ is the same for humans,how much aldicarb would it take to kill an 80 kg person?

Which of the following statements about humus is NOT correct?

Which of the following types of compounds do NOT accumulate in fatty tissues?

A phosphorus-containing pesticide is

Organophosphates and chlorinated hydrocarbons have both been used as insecticides.Which of the following statements about these two types of compounds is true?

In 1957,Clear Lake in California was sprayed with DDT such that the water contained 0.02 ppm of DDT.After a period of time,fish in the lake were found to have DDT levels as high as 2000 ppm.This is an example of

Which of the following is the least expensive method of controlling insects?

Paraquat is an example of a ________ herbicide.

Which insecticide was first used by Allied soldiers to combat lice,ticks and mosquitos during World War II?

A compound that causes leaves to fall off plants is a(n)

Praying mantises and ladybugs are predatory insects and will destroy many garden pests.

A worker at an experimental agricultural station spills a substance on her lab coat.The next morning her lab coat is covered with sex crazed moths.The spilled substance was probably

Which of the following statements about early societies is NOT true?

Identify the compound that is NOT a pesticide.

Which of the following statements best describes the land available world-wide for increasing farming and food production?

Green plants are the ultimate source of our food.Which of the following statements about the source of the raw materials that plants incorporate into food is NOT correct?

The three primary plant nutrients are

A preemergent herbicide should be applied to fields when seedlings are at least six inches high.

What does 20-5-15 on a bag of fertilizer mean?

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