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Exam 41: Plant Reproduction

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Question 21

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Competence means that a plant is _________, while determination means that a plant tissue __________.The acquisition of flowering competence is an example of a __________.

A) capable of responding to signals that trigger a fate change; remains capable of adopting more than one possible developmental fate; phaseolus
B) unresponsive to signals that trigger a fate change; is committed to a specific developmental fate; fate change
C) in the process of responding to signals that trigger a fate change; was driven to adopt an abnormal developmental fate by transgene expression; flowerization
D) capable of responding to signals that trigger a fate change; is committed to a specific developmental fate; phase change

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

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Question 22

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Which tissue can NOT divide to give rise to identical progeny in a plant that reproduces asexually?

A) root
B) stem
C) leaf
D) pollen grain

E) A) and D)
F) None of the above

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Question 23

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The HOBBIT gene in an embryo helps to control the development of what structure?

Why do many plants use the photoperiodic pathway to regulate the timing of flower formation?

A seed that lands in the forest soil is homozygous mutant for the LEAFY (LFY) gene, and as a result does not produce any functional LEAFY protein.What do you predict will happen during the development of this seed?

Arabidopsis plants with a mutation in the gene embryonic Flower (EMF) produce flowers almost immediately after germination, before shoot growth occurs.What is the normal role of this gene?

Dandelions develop seeds by apomixis.What benefits does this strategy provide over vegetative or sexual reproduction?

What is the best description of double fertilization in angiosperms?

Which of the following statements about plant tissue culture is false?

Which of the following statements about the epicotyl is true?

Stratification refers to the extended exposure to ________________ that is required for some seeds to germinate.

What does the globular stage of plant embryo development give rise to?

A genus of primarily wind-pollinated plants includes one unusual species that has evolved to be pollinated by insects.Several morphological changes have accompanied this adaptation.The ______________ are more colorful, there is a nectary at the base of the ______________, the ________________ are shorter and produce sticky pollen, and the __________________ are stickier for enhanced pollen capture.

What process results in the formation of the endosperm and the embryo in angiosperms?

Which structure contains the angiosperm egg?

Pollination begins when pollen is transferred from the ________ to the ________ of a flower.

One way to improve crop productivity is to modify flowering time.This can allow for multiple growing seasons in one year, and can also increase grain production because a smaller plant has lower resource needs.You are approached by an agricultural company that wants to create an early-flowering transgenic plant.Using your knowledge of Arabidopsis genetics, which genetic modifications would you suggest?

Interrupting the night with a flash of light can trigger flowering in a long-day plant.Why doesn't introducing a short period of darkness during the day cause a short-day plant to flower?

Evolutionarily, floral parts represent modified

Which part of the seed produces hydrolytic enzymes that break down the starchy endosperm during seed germination?