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Exam 29: The Working Plant

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Question 21

Multiple Choice

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Which of the following hormones promotes seed germination?

A) auxin
B) ethylene
C) gibberellin
D) abscisic acid

E) C) and D)
F) B) and C)

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Question 22

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Some farmers practice crop rotation,alternating between planting nonlegumes such as corn or wheat one year and legumes the next year.What is the advantage of crop rotation?

A) The legumes in the rotation will transfer nitrogen,phosphorus,and potassium to the other crop plants.
B) Planting legumes enriches the soil for the next year when root nodule bacteria fix so much nitrogen that excess ammonia is secreted into the soil.
C) The nitrogen-fixing bacteria in legumes can migrate to nonlegume crop plants and provide them with nitrogen.
D) Any nitrogen fertilizer that is applied to the soil will be converted into ammonium ions by the nitrogen-fixing bacteria.

E) C) and D)
F) B) and C)

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Question 23

Multiple Choice

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Which of the following convert soil ammonium to nitrate?

The three most important nutrients contained in fertilizers are ________.

Which of the following best describes substances that enter a plant through the root system?

Across the globe,billions of people eat rice.In order to make rice grains (the seed) ,a rice plant must flower and be pollinated.Rice plants flower only after days become shorter (i.e.,summer to autumn) .What is the best classification for rice?

Considering the experiments of the Darwins,Boysen-Jensen,Paal,and Went,what do you conclude about phototropism?

Examine the figure below.Which of the following is the site of carbon dioxide uptake by a plant?

Which of the following supplies water and minerals to a typical plant?

Which of the following describes a chemical element that a plant must obtain from its environment in order to complete its life cycle?

Examine the figure below.When considering the shaded side of a grass shoot,which of the following best describes why it bends toward the light?

For a plant,carbon and nitrogen are ________.

A scientist finds seeds of an unknown plant on top of the soil in a desert.She measures the concentration of two hormones in these seeds.After it rains,she collects more of these seeds,and finds that the concentration of the two hormones has changed.A graph of her results is shown above.Identify the most likely hormones measured by the scientist.

Which of the following hormones promotes cell elongation in stems?

Which one of the following is a plant micronutrient?

Most plants rely on bacteria to supply them with a usable form of which of the following substances?

Transpiration pulls water up a plant because of two mechanisms: ________ describes water molecules sticking together and ________ describes water molecules sticking to the walls of the xylem.

Which of the following best describes the opening and closing of the stomata in most plants?

Oats are eaten by humans as oatmeal or rolled oats,and as feed for livestock such as cattle.In order for an oat plant to make the part we eat (the seed) ,it must flower and be pollinated.Typically,oat plants flower when days are lengthening (i.e.,late spring to early summer) .What is the best classification for oat plants?

Which of the following best describes the role of plant root nodules in plants such as peas and beans?