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Biology > 8.1 > Flashcards

8.1 Flashcards

1
Q

What are plant responses to stimuli known as?

A

Tropisms

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2
Q

What is the definition of growth?

A

A permanent increase in the size of an organism or some part of it

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3
Q

What are the three stages of growth in plants?

A

Division, assimilation and elongation

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4
Q

What occurs during elongation?

A

Vacuoles develop, the cell wall stretches and a large central vacuole is produced, elongating the cell

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5
Q

What does chlorophyll formation depend on?

A

Light and day length

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6
Q

What type of light is most effective at stimulating germination?

A

Red light

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7
Q

What type of light inhibits germination?

A

Far red light

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8
Q

If seeds are exposed to a flash of red light, what will occur?

A

They will germinate

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9
Q

What is the class of pigments that cause the reaction to types of light know as?

A

Phytochromes

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10
Q

What is the wave length of Pr?

A

P680

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11
Q

What is the wavelength of Pfr?

A

P730

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12
Q

What is the factor that determines how long it takes for one pigment to be converted into another?

A

Light intensity

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13
Q

Does the conversion of Pfr to Pr take place fast or slow in the dark

A

Slow

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14
Q

Which pigment is more stable?

A

Pr

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15
Q

What is it called when plants grow rapidly in dark conditions to find light?

A

Etiolation

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16
Q

Without Pfr in dark conditions what happens to the plant?

A

The internodes grow but the leaves do not and chlorophyll does not form

17
Q

What is the current hypothesis on Pfr ?

A

That it inhibits flowering

18
Q

In long day plants what stimulates flowering?

A

The build up of Pfr

19
Q

What pigment detects the photoperiod?

A

Florigen

20
Q

What do auxins or IAA cause?

A

Positive phototropism

21
Q

What occurs when molecules of IAA move to the site d elongation?

A

They bind to the receptor sites activating hydrogen pumps in the cytoplasm, leading an increased flexibility of cell walls

22
Q

What six stimuli are plants sensitive to?

A

Light gravity water temp touch chemicals

Biology (24 decks)

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