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Exam 29: The Working Plant

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Question 31

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Which of the following best describes the mechanism that causes stomata to open?

A) Water accumulates below the opening and eventually causes the stoma to open.
B) A large bubble of oxygen accumulates below the stoma and eventually causes it to open.
C) Two guard cells flanking each stoma control its opening by changing shape.
D) The internal pressure of xylem sap expands the leaf, stretching the stoma open.

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

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Question 32

Multiple Choice

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The figure below shows plants originally grown in the dark,and then a light is added on one side only (arrow) .Predict the response of the plants to the addition of the light source.

A) Auxin becomes concentrated on the lighted side of the plants, and the plants begin to grow toward the light.
B) Auxin becomes concentrated on the darker side of the plants, and the plants begin to grow toward the light.
C) Auxin becomes concentrated on the lighted side of the plants, and the plants begin to grow away from the light.
D) Auxin becomes concentrated on the darker side of the plants, and the plants begin to grow away from the light.

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

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Question 33

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Early in the spring,cherry trees produce flowers,even before their leaves develop,by using sugars that were stored in their roots the previous year.While cherry flowers are developing,we would expect the phloem pressure near flowers to be ________,and ________ near root storage cells.

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

Which of the following explains how phloem sap moves within a plant?

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 essential difference between plant and animal nutrition?

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

Which of the following convert atmospheric nitrogen to ammonium?

Which of the following hormones promotes seed dormancy?

Which of the following hormones promotes cell division?

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 describe(s) the dependencies of most flowering plants? I) Many depend on insects or other animals for pollination. II) Many depend on insects or other animals for seed dispersal. III) Many depend on fungi to help them acquire nutrients.

Which of the following best describes night-neutral plants?

Which of the following hormones promotes fruit ripening and dropping of leaves?

-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.If the scientist returns to the desert to collect more seeds,a few days later,what should she observe?

Trace the flow of a water molecule that is used during photosynthesis.